From 5f42c3f76cb2004e556c23b06338327c375e68a6 Mon Sep 17 00:00:00 2001
From: rtel <rtel@1d2547de-c912-0410-9cb9-b8ca96c0e9e2>
Date: Sun, 13 Oct 2019 22:53:00 +0000
Subject: [PATCH] Added the "full" demo to the RISC-V_RV32_SiFive_HiFive1_GCC
 demo - backup check in only as still a work in progress.

git-svn-id: https://svn.code.sf.net/p/freertos/code/trunk@2737 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
---
 .../RISC-V_RV32_SiFive_HiFive1_GCC/.cproject  |  11 +
 .../RISC-V_RV32_SiFive_HiFive1_GCC/.project   |  91 +++++
 .../FreeRTOSConfig.h                          |  20 +-
 .../blinky_demo/main_blinky.c                 |   5 -
 .../bsp/design.dts                            | 209 +++++++++++
 .../bsp/design.reglist                        |  54 +++
 .../bsp/metal.default.lds                     |   5 +-
 .../freedom-metal/gloss/crt0.S                |   2 +-
 .../full_demo/RegTest.S                       | 266 ++++++++++++++
 .../full_demo/main_full.c                     | 332 ++++++++++++++++++
 .../RISC-V_RV32_SiFive_HiFive1_GCC/main.c     | 152 +++-----
 11 files changed, 1021 insertions(+), 126 deletions(-)
 create mode 100644 FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.dts
 create mode 100644 FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.reglist
 create mode 100644 FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/RegTest.S
 create mode 100644 FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/main_full.c

diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.cproject b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.cproject
index f7e341555..4422a43b6 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.cproject
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.cproject
@@ -25,6 +25,7 @@
 								<option id="gnu.c.compiler.option.dialect.std.1648189865" name="Language standard" superClass="gnu.c.compiler.option.dialect.std" useByScannerDiscovery="true" value="gnu.c.compiler.dialect.default" valueType="enumerated"/>
 								<option id="gnu.c.compiler.option.include.paths.1720192082" name="Include paths (-I)" superClass="gnu.c.compiler.option.include.paths" useByScannerDiscovery="false" valueType="includePath">
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/FreeRTOS_Source/include}&quot;"/>
+									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/full_demo/Common_Demo_Tasks/include}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/FreeRTOS_Source/portable/GCC/RISC-V}&quot;"/>
 									<listOptionValue builtIn="false" value="&quot;${workspace_loc:/${ProjName}/FreeRTOS_Source/include}&quot;"/>
@@ -59,6 +60,16 @@
 							</tool>
 						</toolChain>
 					</folderInfo>
+					<folderInfo id="cdt.managedbuild.config.gnu.cross.exe.debug.206163480.226910554" name="/" resourcePath="full_demo/Common_Demo_Tasks">
+						<toolChain id="cdt.managedbuild.toolchain.gnu.cross.exe.debug.1460593804" name="Cross GCC" superClass="cdt.managedbuild.toolchain.gnu.cross.exe.debug" unusedChildren="">
+							<tool id="cdt.managedbuild.tool.gnu.cross.c.compiler.1285988628" name="Cross GCC Compiler" superClass="cdt.managedbuild.tool.gnu.cross.c.compiler.1469975065"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.cpp.compiler.223438273" name="Cross G++ Compiler" superClass="cdt.managedbuild.tool.gnu.cross.cpp.compiler.420742449"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.c.linker.609362678" name="Cross GCC Linker" superClass="cdt.managedbuild.tool.gnu.cross.c.linker.558060359"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.cpp.linker.1231291683" name="Cross G++ Linker" superClass="cdt.managedbuild.tool.gnu.cross.cpp.linker.2105463183"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.archiver.585811070" name="Cross GCC Archiver" superClass="cdt.managedbuild.tool.gnu.cross.archiver.424513814"/>
+							<tool id="cdt.managedbuild.tool.gnu.cross.assembler.376247243" name="Cross GCC Assembler" superClass="cdt.managedbuild.tool.gnu.cross.assembler.825438707"/>
+						</toolChain>
+					</folderInfo>
 					<sourceEntries>
 						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name=""/>
 					</sourceEntries>
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.project b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.project
index a9213bc29..f22f74077 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.project
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/.project
@@ -29,6 +29,16 @@
 			<type>2</type>
 			<locationURI>FREERTOS_ROOT/FreeRTOS/Source</locationURI>
 		</link>
+		<link>
+			<name>full_demo/Common_Demo_Tasks</name>
+			<type>2</type>
+			<locationURI>FREERTOS_ROOT/FreeRTOS/Demo/Common/Minimal</locationURI>
+		</link>
+		<link>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>2</type>
+			<locationURI>FREERTOS_ROOT/FreeRTOS/Demo/Common/include</locationURI>
+		</link>
 	</linkedResources>
 	<filteredResources>
 		<filter>
@@ -175,6 +185,42 @@
 				<arguments>1.0-name-matches-false-false-GCC</arguments>
 			</matcher>
 		</filter>
+		<filter>
+			<id>1571005814144</id>
+			<name>full_demo/Common_Demo_Tasks</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-TimerDemo.c</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005814150</id>
+			<name>full_demo/Common_Demo_Tasks</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-blocktim.c</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005814159</id>
+			<name>full_demo/Common_Demo_Tasks</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-dynamic.c</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005814167</id>
+			<name>full_demo/Common_Demo_Tasks</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-TaskNotify.c</arguments>
+			</matcher>
+		</filter>
 		<filter>
 			<id>1570727992991</id>
 			<name>FreeRTOS_Source/portable/GCC</name>
@@ -193,6 +239,51 @@
 				<arguments>1.0-name-matches-false-false-heap_4.c</arguments>
 			</matcher>
 		</filter>
+		<filter>
+			<id>1571005832815</id>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-TimerDemo.h</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005832820</id>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-blocktim.h</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005832824</id>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-dynamic.h</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005832829</id>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-MessageBufferDemo.h</arguments>
+			</matcher>
+		</filter>
+		<filter>
+			<id>1571005832835</id>
+			<name>full_demo/Common_Demo_Tasks/include</name>
+			<type>5</type>
+			<matcher>
+				<id>org.eclipse.ui.ide.multiFilter</id>
+				<arguments>1.0-name-matches-false-false-TaskNotify.h</arguments>
+			</matcher>
+		</filter>
 		<filter>
 			<id>1570728021983</id>
 			<name>FreeRTOS_Source/portable/GCC/RISC-V/chip_specific_extensions</name>
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/FreeRTOSConfig.h b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/FreeRTOSConfig.h
index d27c2557b..207d2e2bd 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/FreeRTOSConfig.h
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/FreeRTOSConfig.h
@@ -90,8 +90,8 @@
 #define configCPU_CLOCK_HZ				( 32768 ) /*QEMU*/
 #define configTICK_RATE_HZ				( ( TickType_t ) 1000 )
 #define configMAX_PRIORITIES			( 7 )
-#define configMINIMAL_STACK_SIZE		( ( unsigned short ) 70 )
-#define configTOTAL_HEAP_SIZE			( ( size_t ) 10000 )
+#define configMINIMAL_STACK_SIZE		( ( unsigned short ) 120 ) /* Only needs to be this high as some demo tasks also use this constant.  In production only the idle task would use this. */
+#define configTOTAL_HEAP_SIZE			( ( size_t ) 10900 )
 #define configMAX_TASK_NAME_LEN			( 16 )
 #define configUSE_TRACE_FACILITY		0
 #define configUSE_16_BIT_TICKS			0
@@ -113,8 +113,8 @@
 /* Software timer definitions. */
 #define configUSE_TIMERS				1
 #define configTIMER_TASK_PRIORITY		( configMAX_PRIORITIES - 1 )
-#define configTIMER_QUEUE_LENGTH		4
-#define configTIMER_TASK_STACK_DEPTH	( 100 )
+#define configTIMER_QUEUE_LENGTH		8
+#define configTIMER_TASK_STACK_DEPTH	( 160 )
 
 /* Task priorities.  Allow these to be overridden. */
 #ifndef uartPRIMARY_PRIORITY
@@ -138,16 +138,4 @@ header file. */
 void vAssertCalled( void );
 #define configASSERT( x ) if( ( x ) == 0 ) vAssertCalled()
 
-/* Overwrite some of the stack sizes allocated to various test and demo tasks.
-Like all task stack sizes, the value is the number of words, not bytes. */
-#define bktBLOCK_TIME_TASK_STACK_SIZE 100
-#define notifyNOTIFIED_TASK_STACK_SIZE 120
-#define priSUSPENDED_RX_TASK_STACK_SIZE 90
-#define tmrTIMER_TEST_TASK_STACK_SIZE 100
-#define ebRENDESVOUS_TEST_TASK_STACK_SIZE 100
-#define ebEVENT_GROUP_SET_BITS_TEST_TASK_STACK_SIZE 115
-#define genqMUTEX_TEST_TASK_STACK_SIZE 90
-#define genqGENERIC_QUEUE_TEST_TASK_STACK_SIZE 100
-#define recmuRECURSIVE_MUTEX_TEST_TASK_STACK_SIZE 90
-
 #endif /* FREERTOS_CONFIG_H */
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/blinky_demo/main_blinky.c b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/blinky_demo/main_blinky.c
index 1e5cf0a9c..727560b7a 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/blinky_demo/main_blinky.c
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/blinky_demo/main_blinky.c
@@ -191,14 +191,9 @@ extern void vToggleLED( void );
 		is it the expected value?  If it is, toggle the LED. */
 		if( ulReceivedValue == ulExpectedValue )
 		{
-			write( STDOUT_FILENO, pcPassMessage, strlen( pcPassMessage ) );
 			vToggleLED();
 			ulReceivedValue = 0U;
 		}
-		else
-		{
-			write( STDOUT_FILENO, pcFailMessage, strlen( pcFailMessage ) );
-		}
 	}
 }
 /*-----------------------------------------------------------*/
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.dts b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.dts
new file mode 100644
index 000000000..970d3be72
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.dts
@@ -0,0 +1,209 @@
+/dts-v1/;
+
+/ {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        compatible = "sifive,hifive1-revb";
+        model = "sifive,hifive1-revb";
+
+        chosen {
+                stdout-path = "/soc/serial@10013000:115200";
+                metal,entry = <&spi0 0x10000>;
+        };
+
+        cpus {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                compatible = "sifive,fe310-g000";
+                L6: cpu@0 {
+                        clocks = <&hfclk>;
+                        compatible = "sifive,rocket0", "riscv";
+                        device_type = "cpu";
+                        i-cache-block-size = <64>;
+                        i-cache-sets = <128>;
+                        i-cache-size = <16384>;
+                        next-level-cache = <&spi0>;
+                        reg = <0>;
+                        riscv,isa = "rv32imac";
+                        riscv,pmpregions = <8>;
+                        sifive,dtim = <&dtim>;
+                        status = "okay";
+                        timebase-frequency = <1000000>;
+                        hardware-exec-breakpoint-count = <4>;
+                        hlic: interrupt-controller {
+                                #interrupt-cells = <1>;
+                                compatible = "riscv,cpu-intc";
+                                interrupt-controller;
+                        };
+                };
+        };
+
+        soc {
+                #address-cells = <1>;
+                #size-cells = <1>;
+                #clock-cells = <1>;
+                compatible = "sifive,hifive1";
+                ranges;
+                hfxoscin: clock@0 {
+                        #clock-cells = <0>;
+                        compatible = "fixed-clock";
+                        clock-frequency = <16000000>;
+                };
+                hfxoscout: clock@1 {
+                        compatible = "sifive,fe310-g000,hfxosc";
+                        clocks = <&hfxoscin>;
+                        reg = <&prci 0x4>;
+                        reg-names = "config";
+                };
+                hfroscin: clock@2 {
+                        #clock-cells = <0>;
+                        compatible = "fixed-clock";
+                        clock-frequency = <72000000>;
+                };
+                hfroscout: clock@3 {
+                        compatible = "sifive,fe310-g000,hfrosc";
+                        clocks = <&hfroscin>;
+                        reg = <&prci 0x0>;
+                        reg-names = "config";
+                };
+                hfclk: clock@4 {
+                        compatible = "sifive,fe310-g000,pll";
+                        clocks = <&hfxoscout &hfroscout>;
+                        clock-names = "pllref", "pllsel0";
+                        reg = <&prci 0x8 &prci 0xc>;
+                        reg-names = "config", "divider";
+			clock-frequency = <16000000>;
+                };
+
+                lfroscin: clock@5 {
+                        #clock-cells = <0>;
+                        compatible = "fixed-clock";
+                        clock-frequency = <32000000>;
+                };
+                lfclk: clock@6 {
+                        compatible = "sifive,fe310-g000,lfrosc";
+                        clocks = <&lfroscin>;
+                        reg = <&aon 0x70>;
+                        reg-names = "config";
+                };
+
+                aon: aon@10000000 {
+                        compatible = "sifive,aon0";
+                        reg = <0x10000000 0x8000>;
+                        reg-names = "mem";
+                };
+
+                prci: prci@10008000 {
+                        compatible = "sifive,fe310-g000,prci";
+                        reg = <0x10008000 0x8000>;
+                        reg-names = "mem";
+                };
+
+                clint: clint@2000000 {
+                        compatible = "riscv,clint0";
+                        interrupts-extended = <&hlic 3 &hlic 7>;
+                        reg = <0x2000000 0x10000>;
+                        reg-names = "control";
+                };
+                local-external-interrupts-0 {
+                        compatible = "sifive,local-external-interrupts0";
+                        interrupt-parent = <&hlic>;
+                        interrupts = <16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31>;
+                };
+                plic: interrupt-controller@c000000 {
+                        #interrupt-cells = <1>;
+                        compatible = "riscv,plic0";
+                        interrupt-controller;
+                        interrupts-extended = <&hlic 11>;
+                        reg = <0xc000000 0x4000000>;
+                        reg-names = "control";
+                        riscv,max-priority = <7>;
+                        riscv,ndev = <26>;
+                };
+                global-external-interrupts {
+                        compatile = "sifive,global-external-interrupts0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <1 2 3 4>;
+                };
+
+                debug-controller@0 {
+                        compatible = "sifive,debug-011", "riscv,debug-011";
+                        interrupts-extended = <&hlic 65535>;
+                        reg = <0x0 0x100>;
+                        reg-names = "control";
+                };
+
+                maskrom@1000 {
+                        reg = <0x1000 0x2000>;
+                        reg-names = "mem";
+                };
+                otp@20000 {
+                        reg = <0x20000 0x2000 0x10010000 0x1000>;
+                        reg-names = "mem", "control";
+                };
+
+                dtim: dtim@80000000 {
+                        compatible = "sifive,dtim0";
+                        reg = <0x80000000 0x4000>;
+                        reg-names = "mem";
+                };
+
+                pwm@10015000 {
+                        compatible = "sifive,pwm0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <23 24 25 26>;
+                        reg = <0x10015000 0x1000>;
+                        reg-names = "control";
+                };
+                gpio0: gpio@10012000 {
+                        compatible = "sifive,gpio0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22>;
+                        reg = <0x10012000 0x1000>;
+                        reg-names = "control";
+                };
+                uart0: serial@10013000 {
+                        compatible = "sifive,uart0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <5>;
+                        reg = <0x10013000 0x1000>;
+                        reg-names = "control";
+                        clocks = <&hfclk>;
+                        pinmux = <&gpio0 0x30000 0x30000>;
+                };
+                spi0: spi@10014000 {
+                        compatible = "sifive,spi0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <6>;
+                        reg = <0x10014000 0x1000 0x20000000 0x7A120>;
+                        reg-names = "control", "mem";
+                        clocks = <&hfclk>;
+                        pinmux = <&gpio0 0x0003C 0x0003C>;
+                };
+                i2c0: i2c@10016000 {
+                        compatible = "sifive,i2c0";
+                        interrupt-parent = <&plic>;
+                        interrupts = <52>;
+                        reg = <0x10016000 0x1000>;
+                        reg-names = "control";
+                };
+                led@0red {
+                        compatible = "sifive,gpio-leds";
+                        label = "LD0red";
+                        gpios = <&gpio0 22>;
+                        linux,default-trigger = "none";
+                };
+                led@0green {
+                        compatible = "sifive,gpio-leds";
+                        label = "LD0green";
+                        gpios = <&gpio0 19>;
+                        linux,default-trigger = "none";
+                };
+                led@0blue {
+                        compatible = "sifive,gpio-leds";
+                        label = "LD0blue";
+                        gpios = <&gpio0 21>;
+                        linux,default-trigger = "none";
+                };
+        };
+};
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.reglist b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.reglist
new file mode 100644
index 000000000..921dd83ac
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/design.reglist
@@ -0,0 +1,54 @@
+zero
+ra
+sp
+gp
+tp
+t0
+t1
+t2
+fp
+s1
+a0
+a1
+a2
+a3
+a4
+a5
+a6
+a7
+s2
+s3
+s4
+s5
+s6
+s7
+s8
+s9
+s10
+s11
+t3
+t4
+t5
+t6
+pc
+mstatus
+misa
+mie
+mtvec
+mscratch
+mepc
+mcause
+mtval
+mip
+mvendorid
+marchid
+mimpid
+mhartid
+tselect
+tdata1
+tdata2
+tdata3
+dcsr
+dpc
+dscratch
+priv
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/metal.default.lds b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/metal.default.lds
index 1d45a9266..7070af7e8 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/metal.default.lds
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/bsp/metal.default.lds
@@ -26,7 +26,7 @@ SECTIONS
 {
 	__stack_size = DEFINED(__stack_size) ? __stack_size : 0x400;
 	PROVIDE(__stack_size = __stack_size);
-	__heap_size = DEFINED(__heap_size) ? __heap_size : 0x400;
+	__heap_size = DEFINED(__heap_size) ? __heap_size : 0x4;
 	PROVIDE(__metal_boot_hart = 0);
 	PROVIDE(__metal_chicken_bit = 0);
 
@@ -216,7 +216,8 @@ SECTIONS
 		. = ALIGN(16);
 		metal_segment_stack_begin = .;
 		. += __stack_size;
-		_sp = .;
+		. = ALIGN(16);
+		_sp = .;		
 		PROVIDE(metal_segment_stack_end = .);
 		__freertos_irq_stack_top = .;
 	} >ram AT>ram :ram
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/freedom-metal/gloss/crt0.S b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/freedom-metal/gloss/crt0.S
index 2141915ea..7ddab4d41 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/freedom-metal/gloss/crt0.S
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/freedom-metal/gloss/crt0.S
@@ -125,7 +125,7 @@ _start:
   /* The RISC-V port only uses new-style constructors and destructors. */
   la a0, __libc_fini_array
   call atexit
-  call __libc_init_array
+/*_RB_  call __libc_init_array */
 
 _skip_init:
 
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/RegTest.S b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/RegTest.S
new file mode 100644
index 000000000..8eef086e6
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/RegTest.S
@@ -0,0 +1,266 @@
+/*
+ * FreeRTOS Kernel V10.2.1
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+	.extern ulRegTest1LoopCounter
+	.extern ulRegTest2LoopCounter
+
+	.global vRegTest1Implementation
+	.global vRegTest2Implementation
+
+/*-----------------------------------------------------------*/
+
+/*
+ * The register check tasks are described in the comments at the top of
+ * main_full.c.
+ */
+
+.align( 8 )
+vRegTest1Implementation:
+
+	/* Fill the core registers with known values. */
+	li x5, 0x5
+	li x6, 0x6
+	li x7, 0x7
+	li x8, 0x8
+	li x9, 0x9
+	li x10, 0xa
+	li x11, 0xb
+	li x12, 0xc
+	li x13, 0xd
+	li x14, 0xe
+	li x15, 0xf
+	li x16, 0x10
+	li x17, 0x11
+	li x18, 0x12
+	li x19, 0x13
+	li x20, 0x14
+	li x21, 0x15
+	li x22, 0x16
+	li x23, 0x17
+	li x24, 0x18
+	li x25, 0x19
+	li x26, 0x1a
+	li x27, 0x1b
+	li x28, 0x1c
+	li x29, 0x1d
+	li x30, 0x1e
+
+reg1_loop:
+
+	/* Check each register still contains the expected known value.
+	vRegTest1Implementation uses x31 as the temporary, vRegTest2Implementation
+	uses x5 as the temporary. */
+	li x31, 0x5
+	bne x31, x5, reg1_error_loop
+	li x31, 0x6
+	bne x31, x6, reg1_error_loop
+	li x31, 0x7
+	bne x31, x7, reg1_error_loop
+	li x31, 0x8
+	bne x31, x8, reg1_error_loop
+	li x31, 0x9
+	bne x31, x9, reg1_error_loop
+	li x31, 0xa
+	bne x31, x10, reg1_error_loop
+	li x31, 0xb
+	bne x31, x11, reg1_error_loop
+	li x31, 0xc
+	bne x31, x12, reg1_error_loop
+	li x31, 0xd
+	bne x31, x13, reg1_error_loop
+	li x31, 0xe
+	bne x31, x14, reg1_error_loop
+	li x31, 0xf
+	bne x31, x15, reg1_error_loop
+	li x31, 0x10
+	bne x31, x16, reg1_error_loop
+	li x31, 0x11
+	bne x31, x17, reg1_error_loop
+	li x31, 0x12
+	bne x31, x18, reg1_error_loop
+	li x31, 0x13
+	bne x31, x19, reg1_error_loop
+	li x31, 0x14
+	bne x31, x20, reg1_error_loop
+	li x31, 0x15
+	bne x31, x21, reg1_error_loop
+	li x31, 0x16
+	bne x31, x22, reg1_error_loop
+	li x31, 0x17
+	bne x31, x23, reg1_error_loop
+	li x31, 0x18
+	bne x31, x24, reg1_error_loop
+	li x31, 0x19
+	bne x31, x25, reg1_error_loop
+	li x31, 0x1a
+	bne x31, x26, reg1_error_loop
+	li x31, 0x1b
+	bne x31, x27, reg1_error_loop
+	li x31, 0x1c
+	bne x31, x28, reg1_error_loop
+	li x31, 0x1d
+	bne x31, x29, reg1_error_loop
+	li x31, 0x1e
+	bne x31, x30, reg1_error_loop
+
+	/* Everything passed, increment the loop counter. */
+	lw x31, ulRegTest1LoopCounterConst
+	lw x30, 0(x31)
+	addi x30, x30, 1
+	sw x30, 0(x31)
+
+	/* Restore clobbered register reading for next loop. */
+	li x30, 0x1e
+
+	/* Yield to increase code coverage. */
+	ecall
+
+	/* Start again. */
+	jal reg1_loop
+
+reg1_error_loop:
+	/* Jump here if a register contains an uxpected value.  This stops the loop
+	counter being incremented so the check task knows an error was found. */
+	ebreak
+	jal reg1_error_loop
+
+.align( 16 )
+ulRegTest1LoopCounterConst: .word ulRegTest1LoopCounter
+
+/*-----------------------------------------------------------*/
+
+.align( 8 )
+vRegTest2Implementation:
+
+	/* Fill the core registers with known values. */
+	li x6, 0x61
+	li x7, 0x71
+	li x8, 0x81
+	li x9, 0x91
+	li x10, 0xa1
+	li x11, 0xb1
+	li x12, 0xc1
+	li x13, 0xd1
+	li x14, 0xe1
+	li x15, 0xf1
+	li x16, 0x20
+	li x17, 0x21
+	li x18, 0x22
+	li x19, 0x23
+	li x20, 0x24
+	li x21, 0x25
+	li x22, 0x26
+	li x23, 0x27
+	li x24, 0x28
+	li x25, 0x29
+	li x26, 0x2a
+	li x27, 0x2b
+	li x28, 0x2c
+	li x29, 0x2d
+	li x30, 0x2e
+	li x31, 0x2f
+
+Reg2_loop:
+
+	/* Check each register still contains the expected known value.
+	vRegTest2Implementation uses x5 as the temporary, vRegTest1Implementation
+	uses x31 as the temporary. */
+	li x5, 0x61
+	bne x5, x6, reg2_error_loop
+	li x5, 0x71
+	bne x5, x7, reg2_error_loop
+	li x5, 0x81
+	bne x5, x8, reg2_error_loop
+	li x5, 0x91
+	bne x5, x9, reg2_error_loop
+	li x5, 0xa1
+	bne x5, x10, reg2_error_loop
+	li x5, 0xb1
+	bne x5, x11, reg2_error_loop
+	li x5, 0xc1
+	bne x5, x12, reg2_error_loop
+	li x5, 0xd1
+	bne x5, x13, reg2_error_loop
+	li x5, 0xe1
+	bne x5, x14, reg2_error_loop
+	li x5, 0xf1
+	bne x5, x15, reg2_error_loop
+	li x5, 0x20
+	bne x5, x16, reg2_error_loop
+	li x5, 0x21
+	bne x5, x17, reg2_error_loop
+	li x5, 0x22
+	bne x5, x18, reg2_error_loop
+	li x5, 0x23
+	bne x5, x19, reg2_error_loop
+	li x5, 0x24
+	bne x5, x20, reg2_error_loop
+	li x5, 0x25
+	bne x5, x21, reg2_error_loop
+	li x5, 0x26
+	bne x5, x22, reg2_error_loop
+	li x5, 0x27
+	bne x5, x23, reg2_error_loop
+	li x5, 0x28
+	bne x5, x24, reg2_error_loop
+	li x5, 0x29
+	bne x5, x25, reg2_error_loop
+	li x5, 0x2a
+	bne x5, x26, reg2_error_loop
+	li x5, 0x2b
+	bne x5, x27, reg2_error_loop
+	li x5, 0x2c
+	bne x5, x28, reg2_error_loop
+	li x5, 0x2d
+	bne x5, x29, reg2_error_loop
+	li x5, 0x2e
+	bne x5, x30, reg2_error_loop
+	li x5, 0x2f
+	bne x5, x31, reg2_error_loop
+
+	/* Everything passed, increment the loop counter. */
+	lw x5, ulRegTest2LoopCounterConst
+	lw x6, 0(x5)
+	addi x6, x6, 1
+	sw x6, 0(x5)
+
+	/* Restore clobbered register reading for next loop. */
+	li x6, 0x61
+
+	/* Start again. */
+	jal Reg2_loop
+
+reg2_error_loop:
+	/* Jump here if a register contains an uxpected value.  This stops the loop
+	counter being incremented so the check task knows an error was found. */
+	ebreak
+	jal reg2_error_loop
+
+.align( 16 )
+ulRegTest2LoopCounterConst: .word ulRegTest2LoopCounter
+
+
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/main_full.c b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/main_full.c
new file mode 100644
index 000000000..5813c1306
--- /dev/null
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/full_demo/main_full.c
@@ -0,0 +1,332 @@
+/*
+ * FreeRTOS Kernel V10.2.1
+ * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * http://www.FreeRTOS.org
+ * http://aws.amazon.com/freertos
+ *
+ * 1 tab == 4 spaces!
+ */
+
+/******************************************************************************
+ * NOTE 1:  This project provides two demo applications.  A simple blinky style
+ * project, and a more comprehensive test and demo application.  The
+ * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting in main.c is used to select
+ * between the two.  See the notes on using mainCREATE_SIMPLE_BLINKY_DEMO_ONLY
+ * in main.c.  This file implements the comprehensive test and demo version.
+ *
+ * NOTE 2:  This file only contains the source code that is specific to the
+ * full demo.  Generic functions, such FreeRTOS hook functions, and functions
+ * required to configure the hardware, are defined in main.c.
+ *
+ ******************************************************************************
+ *
+ * main_full() creates all the demo application tasks and software timers, then
+ * starts the scheduler.  The web documentation provides more details of the
+ * standard demo application tasks, which provide no particular functionality,
+ * but do provide a good example of how to use the FreeRTOS API.
+ *
+ * In addition to the standard demo tasks, the following tasks and tests are
+ * defined and/or created within this file:
+ *
+ * "Reg test" tasks - These fill both the core registers with known values, then
+ * check that each register maintains its expected value for the lifetime of the
+ * task.  Each task uses a different set of values.  The reg test tasks execute
+ * with a very low priority, so get preempted very frequently.  A register
+ * containing an unexpected value is indicative of an error in the context
+ * switching mechanism.
+ *
+ * "Check" task - The check executes every three seconds.  It checks that all
+ * the standard demo tasks, and the register check tasks, are not only still
+ * executing, but are executing without reporting any errors.  If the check task
+ * discovers that a task has either stalled, or reported an error, then it
+ * prints an error message to the UART, otherwise it prints "Pass.".
+ */
+
+/* Standard includes. */
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+/* Kernel includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "timers.h"
+#include "semphr.h"
+
+/* Standard demo application includes. */
+#include "dynamic.h"
+#include "blocktim.h"
+#include "GenQTest.h"
+#include "recmutex.h"
+#include "TimerDemo.h"
+#include "EventGroupsDemo.h"
+#include "TaskNotify.h"
+#include "AbortDelay.h"
+#include "countsem.h"
+#include "death.h"
+#include "MessageBufferDemo.h"
+#include "StreamBufferDemo.h"
+#include "StreamBufferInterrupt.h"
+
+/* Priorities for the demo application tasks. */
+#define mainCHECK_TASK_PRIORITY				( configMAX_PRIORITIES - 1 )
+#define mainCREATOR_TASK_PRIORITY			( tskIDLE_PRIORITY + 3UL )
+
+/* The period of the check task, in ms, converted to ticks using the
+pdMS_TO_TICKS() macro.  mainNO_ERROR_CHECK_TASK_PERIOD is used if no errors have
+been found, mainERROR_CHECK_TASK_PERIOD is used if an error has been found. */
+#define mainNO_ERROR_CHECK_TASK_PERIOD		pdMS_TO_TICKS( 3000UL )
+#define mainERROR_CHECK_TASK_PERIOD			pdMS_TO_TICKS( 500UL )
+
+/* Parameters that are passed into the register check tasks solely for the
+purpose of ensuring parameters are passed into tasks correctly. */
+#define mainREG_TEST_TASK_1_PARAMETER		( ( void * ) 0x12345678 )
+#define mainREG_TEST_TASK_2_PARAMETER		( ( void * ) 0x87654321 )
+
+/* The base period used by the timer test tasks. */
+#define mainTIMER_TEST_PERIOD				( 50 )
+
+/* The size of the stack allocated to the check task (as described in the
+comments at the top of this file. */
+#define mainCHECK_TASK_STACK_SIZE_WORDS 160
+
+/* Size of the stacks to allocated for the register check tasks. */
+#define mainREG_TEST_STACK_SIZE_WORDS 90
+
+/*-----------------------------------------------------------*/
+
+/*
+ * Called by main() to run the full demo (as opposed to the blinky demo) when
+ * mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 0.
+ */
+void main_full( void );
+
+/*
+ * The check task, as described at the top of this file.
+ */
+static void prvCheckTask( void *pvParameters );
+
+/*
+ * Register check tasks as described at the top of this file.  The nature of
+ * these files necessitates that they are written in an assembly file, but the
+ * entry points are kept in the C file for the convenience of checking the task
+ * parameter.
+ */
+static void prvRegTestTaskEntry1( void *pvParameters );
+extern void vRegTest1Implementation( void );
+static void prvRegTestTaskEntry2( void *pvParameters );
+extern void vRegTest2Implementation( void );
+
+/*
+ * Tick hook used by the full demo, which includes code that interacts with
+ * some of the tests.
+ */
+void vFullDemoTickHook( void );
+
+/*-----------------------------------------------------------*/
+
+/* The following two variables are used to communicate the status of the
+register check tasks to the check task.  If the variables keep incrementing,
+then the register check tasks have not discovered any errors.  If a variable
+stops incrementing, then an error has been found. */
+uint32_t ulRegTest1LoopCounter = 0UL, ulRegTest2LoopCounter = 0UL;
+volatile uint32_t *pulRegTest1LoopCounter = &ulRegTest1LoopCounter;
+volatile uint32_t *pulRegTest2LoopCounter = &ulRegTest2LoopCounter;
+/*-----------------------------------------------------------*/
+
+void main_full( void )
+{
+	/* Start all the other standard demo/test tasks.  They have no particular
+	functionality, but do demonstrate how to use the FreeRTOS API and test the
+	kernel port. */
+	vCreateBlockTimeTasks();
+	vStartTimerDemoTask( mainTIMER_TEST_PERIOD );
+	vStartDynamicPriorityTasks();
+//	vStartMessageBufferTasks( configMINIMAL_STACK_SIZE );
+	vStartTaskNotifyTask();
+
+	/* Create the register check tasks, as described at the top of this	file.
+	Use xTaskCreateStatic() to create a task using only statically allocated
+	memory. */
+	xTaskCreate( prvRegTestTaskEntry1, 			/* The function that implements the task. */
+				 "Reg1", 						/* The name of the task. */
+				 mainREG_TEST_STACK_SIZE_WORDS, /* Size of stack to allocate for the task - in words not bytes!. */
+				 mainREG_TEST_TASK_1_PARAMETER, /* Parameter passed into the task. */
+				 tskIDLE_PRIORITY, 				/* Priority of the task. */
+				 NULL );						/* Can be used to pass out a handle to the created task. */
+	xTaskCreate( prvRegTestTaskEntry2, "Reg2", mainREG_TEST_STACK_SIZE_WORDS, mainREG_TEST_TASK_2_PARAMETER, tskIDLE_PRIORITY, NULL );
+
+	/* Create the task that performs the 'check' functionality,	as described at
+	the top of this file. */
+	xTaskCreate( prvCheckTask, "Check", mainCHECK_TASK_STACK_SIZE_WORDS, NULL, mainCHECK_TASK_PRIORITY, NULL );
+
+	/* Start the scheduler. */
+	vTaskStartScheduler();
+
+	/* If all is well, the scheduler will now be running, and the following
+	line will never be reached.  If the following line does execute, then
+	there was insufficient FreeRTOS heap memory available for the Idle and/or
+	timer tasks to be created.  See the memory management section on the
+	FreeRTOS web site for more details on the FreeRTOS heap
+	http://www.freertos.org/a00111.html. */
+	for( ;; );
+}
+/*-----------------------------------------------------------*/
+volatile uint32_t ulCheckTaskCycles = 0;
+static volatile TaskStatus_t xTaskStatus[ 15 ];
+static void prvCheckTask( void *pvParameters )
+{
+TickType_t xDelayPeriod = mainNO_ERROR_CHECK_TASK_PERIOD;
+TickType_t xLastExecutionTime;
+uint32_t ulLastRegTest1Value = 0, ulLastRegTest2Value = 0;
+char * const pcPassMessage = ".";
+char * pcStatusMessage = pcPassMessage;
+extern void vToggleLED( void );
+
+	/* Just to stop compiler warnings. */
+	( void ) pvParameters;
+
+	/* Initialise xLastExecutionTime so the first call to vTaskDelayUntil()
+	works correctly. */
+	xLastExecutionTime = xTaskGetTickCount();
+
+	/* Cycle for ever, delaying then checking all the other tasks are still
+	operating without error.  The onboard LED is toggled on each iteration.
+	If an error is detected then the delay period is decreased from
+	mainNO_ERROR_CHECK_TASK_PERIOD to mainERROR_CHECK_TASK_PERIOD.  This has the
+	effect of increasing the rate at which the onboard LED toggles, and in so
+	doing gives visual feedback of the system status. */
+	for( ;; )
+	{
+		/* Delay until it is time to execute again. */
+		vTaskDelayUntil( &xLastExecutionTime, xDelayPeriod );
+
+		/* Check all the demo tasks (other than the flash tasks) to ensure
+		that they are all still running, and that none have detected an error. */
+		if( xAreDynamicPriorityTasksStillRunning() == pdFALSE )
+		{
+			pcStatusMessage = "ERROR: Dynamic priority demo/tests.\r\n";
+		}
+
+		if( xAreBlockTimeTestTasksStillRunning() == pdFALSE )
+		{
+			pcStatusMessage = "ERROR: Block time demo/tests.\r\n";
+		}
+
+		if( xAreTimerDemoTasksStillRunning( ( TickType_t ) xDelayPeriod ) == pdFALSE )
+		{
+			pcStatusMessage = "ERROR: Timer demo/tests.\r\n";
+		}
+
+		if( xAreTaskNotificationTasksStillRunning() == pdFALSE )
+		{
+			pcStatusMessage = "ERROR: Task notification demo/tests.\r\n";
+		}
+
+//		if( xAreMessageBufferTasksStillRunning() == pdFALSE )
+		{
+//			pcStatusMessage = "ERROR: Message buffer.\r\n";
+		}
+
+		/* Check that the register test 1 task is still running. */
+		if( ulLastRegTest1Value == ulRegTest1LoopCounter )
+		{
+			pcStatusMessage = "ERROR: Register test 1.\r\n";
+		}
+		ulLastRegTest1Value = ulRegTest1LoopCounter;
+
+		/* Check that the register test 2 task is still running. */
+		if( ulLastRegTest2Value == ulRegTest2LoopCounter )
+		{
+			pcStatusMessage = "ERROR: Register test 2.\r\n";
+		}
+		ulLastRegTest2Value = ulRegTest2LoopCounter;
+
+		/* Write the status message to the UART and toggle the LED to show the
+		system status if the UART is not connected. */
+		vToggleLED();
+
+		/* If an error has been found then increase the LED toggle rate by
+		increasing the cycle frequency. */
+		if( pcStatusMessage != pcPassMessage )
+		{
+			xDelayPeriod = mainERROR_CHECK_TASK_PERIOD;
+			write( STDOUT_FILENO, pcStatusMessage, strlen( pcStatusMessage ) );
+		}
+
+		ulCheckTaskCycles++;
+
+//		uxTaskGetSystemState( xTaskStatus, sizeof( xTaskStatus ) / sizeof( TaskStatus_t ), NULL );
+		__asm volatile( "NOP" );
+	}
+}
+/*-----------------------------------------------------------*/
+
+static void prvRegTestTaskEntry1( void *pvParameters )
+{
+	/* Although the regtest task is written in assembler, its entry point is
+	written in C for convenience of checking the task parameter is being passed
+	in correctly. */
+	if( pvParameters == mainREG_TEST_TASK_1_PARAMETER )
+	{
+		/* Start the part of the test that is written in assembler. */
+		vRegTest1Implementation();
+	}
+
+	/* The following line will only execute if the task parameter is found to
+	be incorrect.  The check task will detect that the regtest loop counter is
+	not being incremented and flag an error. */
+	vTaskDelete( NULL );
+}
+/*-----------------------------------------------------------*/
+
+static void prvRegTestTaskEntry2( void *pvParameters )
+{
+	/* Although the regtest task is written in assembler, its entry point is
+	written in C for convenience of checking the task parameter is being passed
+	in correctly. */
+	if( pvParameters == mainREG_TEST_TASK_2_PARAMETER )
+	{
+		/* Start the part of the test that is written in assembler. */
+		vRegTest2Implementation();
+	}
+
+	/* The following line will only execute if the task parameter is found to
+	be incorrect.  The check task will detect that the regtest loop counter is
+	not being incremented and flag an error. */
+	vTaskDelete( NULL );
+}
+/*-----------------------------------------------------------*/
+
+void vFullDemoTickHook( void )
+{
+	/* Called from vApplicationTickHook() when the project is configured to
+	build the full test/demo applications. */
+
+	/* The full demo includes a software timer demo/test that requires
+	prodding periodically from the tick interrupt. */
+//	vTimerPeriodicISRTests();
+
+	/* Use task notifications from an interrupt. */
+	xNotifyTaskFromISR();
+}
+/*-----------------------------------------------------------*/
+
diff --git a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/main.c b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/main.c
index 6013912ee..ffb6c207f 100644
--- a/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/main.c
+++ b/FreeRTOS/Demo/RISC-V_RV32_SiFive_HiFive1_GCC/main.c
@@ -1,4 +1,3 @@
-#if 1
 /*
  * FreeRTOS Kernel V10.2.1
  * Copyright (C) 2019 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
@@ -35,7 +34,6 @@
 #include <metal/led.h>
 #include <metal/button.h>
 
-
 /******************************************************************************
  * This project provides two demo applications.  A simple blinky style project,
  * and a more comprehensive test and demo application.  The
@@ -56,12 +54,18 @@
 
 #warning Also test in QEMU and add instructions above.
 
+/* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
+or 0 to run the more comprehensive test and demo application. */
+#define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY	0
+
 /* Index to first HART (there is only one). */
 #define mainHART_0 		0
 
-/* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
-or 0 to run the more comprehensive test and demo application. */
-#define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY	1
+/* Register addresses within the PLIC. */
+#define mainPLIC_PENDING_0 ( * ( ( volatile uint32_t * ) 0x0C001000UL ) )
+#define mainPLIC_PENDING_1 ( * ( ( volatile uint32_t * ) 0x0C001004UL ) )
+#define mainPLIC_ENABLE_0  ( * ( ( volatile uint32_t * ) 0x0C002000UL ) )
+#define mainPLIC_ENABLE_1  ( * ( ( volatile uint32_t * ) 0x0C002004UL ) )
 
 /*
  * main_blinky() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.
@@ -111,8 +115,8 @@ static void prvSetupHardware( void )
 struct metal_cpu *pxCPU;
 struct metal_interrupt *pxInterruptController;
 
-	/* Initialise the red LED. */
-	pxLED = metal_led_get_rgb( "LD0", "red" );
+	/* Initialise the blue LED. */
+	pxLED = metal_led_get_rgb( "LD0", "blue" );
 	configASSERT( pxLED );
 	metal_led_enable( pxLED );
 	metal_led_off( pxLED );
@@ -123,6 +127,14 @@ struct metal_interrupt *pxInterruptController;
 	pxInterruptController = metal_cpu_interrupt_controller( pxCPU );
 	configASSERT( pxInterruptController );
 	metal_interrupt_init( pxInterruptController );
+
+	/* Set all interrupt enable bits to 0. */
+	mainPLIC_ENABLE_0 = 0UL;
+	mainPLIC_ENABLE_1 = 0UL;
+
+	/* Clear all pending interrupts. */
+	mainPLIC_PENDING_0 = 0UL;
+	mainPLIC_PENDING_1 = 0UL;
 }
 /*-----------------------------------------------------------*/
 
@@ -184,15 +196,41 @@ void vApplicationTickHook( void )
 
 void vAssertCalled( void )
 {
+static struct metal_led *pxRedLED = NULL;
+volatile uint32_t ul;
+
 	taskDISABLE_INTERRUPTS();
-	for( ;; );
+
+	/* Initialise the red LED. */
+	pxRedLED = metal_led_get_rgb( "LD0", "red" );
+	configASSERT( pxRedLED );
+	metal_led_enable( pxRedLED );
+	metal_led_off( pxRedLED );
+
+	/* Flash the red LED to indicate that assert was hit - interrupts are off
+	here to prevent any further tick interrupts or context switches, so the
+	delay is implemented as a crude loop. */
+	for( ;; )
+	{
+		for( ul = 0; ul < 0x1ffff; ul++ )
+		{
+			__asm volatile( "nop" );
+		}
+		metal_led_toggle( pxRedLED );
+	}
 }
 /*-----------------------------------------------------------*/
 
+volatile uint32_t ulMEPC = 0UL, ulMCAUSE = 0UL, ulPending0Register = 0UL, ulPending1Register = 0UL;
+
 void handle_trap( void )
 {
 #warning Not implemented.
 
+	__asm volatile( "csrr %0, mepc" : "=r"( ulMEPC ) );
+	__asm volatile( "csrr %0, mcause" : "=r"( ulMCAUSE ) );
+	ulPending0Register = mainPLIC_PENDING_0;
+	ulPending1Register = mainPLIC_PENDING_1;
 	configASSERT( metal_cpu_get( mainHART_0 ) == 0x00 );
 }
 /*-----------------------------------------------------------*/
@@ -201,103 +239,13 @@ void vToggleLED( void )
 {
 	metal_led_toggle( pxLED );
 }
+/*-----------------------------------------------------------*/
 
-
-
-
-#else
-
-static void prvSetupTimerInterrupt( void )
+void *malloc( size_t xSize )
 {
-	int rc, up_cnt, dn_cnt;
-
-    // Setup Timer and its interrupt so we can toggle LEDs on 1s cadence
-    tmr_intr = metal_cpu_timer_interrupt_controller(pxCPU);
-    if (tmr_intr == NULL) {
-        printf("TIMER interrupt controller is  null.\n");
-        return 4;
-    }
-    metal_interrupt_init(tmr_intr);
-    tmr_id = metal_cpu_timer_get_interrupt_id(pxCPU);
-    rc = metal_interrupt_register_handler(tmr_intr, tmr_id, timer_isr, pxCPU);
-    if (rc < 0) {
-        printf("TIMER interrupt handler registration failed\n");
-        return (rc * -1);
-    }
-
-    // Lastly CPU interrupt
-    if (metal_interrupt_enable(pxInterruptController, 0) == -1) {
-        printf("CPU interrupt enable failed\n");
-        return 6;
-    }
-
-    // Red -> Green -> Blue, repeat
-    while (1) {
-
-        // Turn on RED
-        wait_for_timer(pxLED);
-
-        // Turn on Green
-        wait_for_timer(led0_green);
-
-        // Turn on Blue
-        wait_for_timer(led0_blue);
-    }
-
-    // return
-    return 0;
+	configASSERT( metal_cpu_get( mainHART_0 ) == 0x00 );
+	return NULL;
 }
 /*-----------------------------------------------------------*/
 
 
-#include <stdio.h>
-#include <metal/cpu.h>
-#include <metal/led.h>
-#include <metal/button.h>
-#include <metal/switch.h>
-
-#define RTC_FREQ    32768
-
-struct metal_cpu *pxCPU;
-struct metal_interrupt *pxInterruptController, *tmr_intr;
-int tmr_id;
-volatile uint32_t timer_isr_flag;
-
-
-void timer_isr (int id, void *data) {
-
-    // Disable Timer interrupt
-    metal_interrupt_disable(tmr_intr, tmr_id);
-
-    // Flag showing we hit timer isr
-    timer_isr_flag = 1;
-}
-
-void wait_for_timer(struct metal_led *which_led) {
-
-    // clear global timer isr flag
-    timer_isr_flag = 0;
-
-    // Turn on desired LED
-    metal_led_on(which_led);
-
-    // Set timer
-    metal_cpu_set_mtimecmp(pxCPU, metal_cpu_get_mtime(pxCPU) + RTC_FREQ);
-
-    // Enable Timer interrupt
-    metal_interrupt_enable(tmr_intr, tmr_id);
-
-    // wait till timer triggers and isr is hit
-    while (timer_isr_flag == 0){};
-
-    timer_isr_flag = 0;
-
-    // Turn off this LED
-    metal_led_off(which_led);
-}
-
-
-
-#endif
-
-
-- 
2.39.2