Changes since U-Boot 1.1.1:
======================================================================
+* Patch by Scott McNutt, 25 Apr 2004:
+ Add Nios GDB/JTAG Console support:
+ - Add stubs to support gdb via JTAG.
+ - Add support for console over JTAG.
+ - Minor cleanup.
+
* Add support for CATcenter board (based on PPChameleon ME module)
* Patch by Klaus Heydeck, 12 May 2004:
TQM8255 MPC8255
CPU86 MPC8260
- PM825 MPC8250
PM826 MPC8260
TQM8260 MPC8260
* _cwp_lolimit -Handles register window underflows.
* _cwp_hilimit -Handles register window overflows.
* _timebase_int -Increments the timebase.
+ * _brkpt_hw_int -Hardware breakpoint handler.
+ * _brkpt_sw_int -Software breakpoint handler.
* _def_xhandler -Default exception handler.
*
* _timebase_int handles a Nios Timer interrupt and increments the
.long _def_xhandler@h /* Vector 0 - NMI */
.long _cwp_lolimit@h /* Vector 1 - underflow */
.long _cwp_hilimit@h /* Vector 2 - overflow */
-
- .long _def_xhandler@h /* Vector 3 - GNUPro debug */
- .long _def_xhandler@h /* Vector 4 - GNUPro debug */
+ .long _brkpt_hw_int@h /* Vector 3 - Breakpoint */
+ .long _brkpt_sw_int@h /* Vector 4 - Single step*/
.long _def_xhandler@h /* Vector 5 - GNUPro debug */
.long _def_xhandler@h /* Vector 6 - future reserved */
.long _def_xhandler@h /* Vector 7 - future reserved */
# this option have to be placed behind -Wall -- that's why it is here
ifeq ($(ARCH),nios)
ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9)
-CFLAGS := $(CPPFLAGS) -Wno-trigraphs
+CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs
endif
endif
int vec;
printf ("\nInterrupt-Information:\n");
- printf ("Nr Routine Arg CouIt's ok to cnt\n");
+ printf ("Nr Routine Arg Count\n");
for (vec=0; vec<64; vec++) {
if (irq_vecs[vec].handler != NULL) {
#include <watchdog.h>
#include <nios-io.h>
+/*------------------------------------------------------------------
+ * JTAG acts as the serial port
+ *-----------------------------------------------------------------*/
+#if defined(CONFIG_CONSOLE_JTAG)
+
+static nios_jtag_t *jtag = (nios_jtag_t *)CFG_NIOS_CONSOLE;
+
+void serial_setbrg( void ){ return; }
+int serial_init( void ) { return(0);}
+
+void serial_putc (char c)
+{
+ while ((jtag->txcntl & NIOS_JTAG_TRDY) != 0)
+ WATCHDOG_RESET ();
+ jtag->txcntl = NIOS_JTAG_TRDY | (unsigned char)c;
+}
+
+void serial_puts (const char *s)
+{
+ while (*s != 0)
+ serial_putc (*s++);
+}
+
+int serial_tstc (void)
+{
+ return (jtag->rxcntl & NIOS_JTAG_RRDY);
+}
+
+int serial_getc (void)
+{
+ int c;
+ while (serial_tstc() == 0)
+ WATCHDOG_RESET ();
+ c = jtag->rxcntl & 0x0ff;
+ jtag->rxcntl = 0;
+ return (c);
+}
+
+/*------------------------------------------------------------------
+ * UART the serial port
+ *-----------------------------------------------------------------*/
+#else
static nios_uart_t *uart = (nios_uart_t *)CFG_NIOS_CONSOLE;
/* Everything's already setup for fixed-baud PTF
* assignment
*/
-void serial_setbrg( void ){ return; }
-int serial_init( void ) { return(0);}
+void serial_setbrg (void){ return; }
+int serial_init (void) { return (0);}
#else
-void serial_setbrg( void )
+void serial_setbrg (void)
{
DECLARE_GLOBAL_DATA_PTR;
unsigned div;
return;
}
-int serial_init( void )
+int serial_init (void)
{
- serial_setbrg();
- return(0);
+ serial_setbrg ();
+ return (0);
}
#endif /* CFG_NIOS_FIXEDBAUD */
-void serial_putc( char c )
+/*-----------------------------------------------------------------------
+ * UART CONSOLE
+ *---------------------------------------------------------------------*/
+void serial_putc (char c)
{
if (c == '\n')
- serial_putc('\r');
- while( (uart->status & NIOS_UART_TRDY) == 0 )
+ serial_putc ('\r');
+ while ((uart->status & NIOS_UART_TRDY) == 0)
WATCHDOG_RESET ();
uart->txdata = (unsigned char)c;
}
-void serial_puts( const char *s )
+void serial_puts (const char *s)
{
- while( *s != 0 ) {
- serial_putc( *s++ );
+ while (*s != 0) {
+ serial_putc (*s++);
}
}
-int serial_tstc( void )
+int serial_tstc (void)
{
- return( uart->status & NIOS_UART_RRDY);
+ return (uart->status & NIOS_UART_RRDY);
}
-int serial_getc( void )
+int serial_getc (void)
{
- while( serial_tstc() == 0 )
+ while (serial_tstc () == 0)
WATCHDOG_RESET ();
return( uart->rxdata & 0x00ff );
}
+
+#endif /* CONFIG_JTAG_CONSOLE */
subi %g6, 4 /* %g6 <- src addr */
ld %g7, [%g7] /* %g7 <- dst addr */
+ /* No need to move text sections if we're already located
+ * at the proper address.
+ */
+ cmp %g7, %g6
+ ifs cc_z
+ br reloc
+ nop /* delay slot */
+
1: cmp %g7, %g5
skps cc_nz
br 2f
pfx %xhi(reloc@h)
movhi %g0, %xlo(reloc@h)
jmp %g0
+ nop /* delay slot */
reloc:
/*
nop /* delay slot */
4:
+ /*
+ * INIT VECTOR TABLE
+ */
+ pfx %hi(CFG_VECT_BASE)
+ movi %g0, %lo(CFG_VECT_BASE)
+ pfx %xhi(CFG_VECT_BASE)
+ movhi %g0, %xlo(CFG_VECT_BASE) /* dst */
+ mov %l0, %g0
+
+ pfx %hi(_vectors)
+ movi %g1, %lo(_vectors)
+ pfx %xhi(_vectors)
+ movhi %g1, %xlo(_vectors) /* src */
+ bgen %g2, 6 /* cnt = 64 */
+
+ ldp %g3, [%l0, 3] /* bkpt vector */
+ ldp %g4, [%l0, 4] /* single step vector */
+
+5: ld %g7, [%g1]
+ addi %g1, 4 /* src++ */
+ st [%g0], %g7
+ addi %g0, 4 /* dst++ */
+
+ subi %g2, 1 /* cnt-- */
+ ifrnz %g2
+ br 5b
+ nop /* delay slot */
+
+#if defined(CONFIG_ROM_STUBS)
+ /* Restore the breakpoint and single step exception
+ * vectors to their original values.
+ */
+ stp [%l0,3], %g3 /* breakpoint */
+ stp [%l0,4], %g4 /* single step */
+#endif
+
+ /* For debug startup convenience ... software breakpoints
+ * set prior to this point may not succeed ;-)
+ */
+ .global __start
+__start:
+
/*
* Call board_init -- never returns
*/
mov %fp, %sp
tret %o7 /* Done */
+
+/*************************************************************************
+ * GDB stubs
+ ************************************************************************/
+ .text
+ .global _brkpt_hw_int, _brkpt_sw_int
+ .align 4
+
+_brkpt_hw_int:
+ movi %l1, 9
+ pfx 3
+ wrctl %l1
+ pfx 4
+ wrctl %l1
+
+_brkpt_sw_int:
+ movi %l1, 9
+ pfx 3
+ wrctl %l1
+ pfx 4
+ wrctl %l1
+
+ tret %o7
a problem as little, if any, of the Altera source contains
features that are not already available in U-Boot.
+1.3 Debugging via OCI
+---------------------
+The Nios port supports debugging with gdb and/or nios-console
+via the JTAG port. Stubs for debugging with gdb via the serial
+port are not currently implemented.
+
2. CONFIGURATION OPTIONS/SETTINGS
----------------------------------
CONFIG_NIOS -- defined for all Nios-32 boards.
-CFG_NIOS_CONSOLE -- the base address of the console UART.
+CFG_NIOS_CONSOLE -- the base address of the console UART or the JTAG
+ stdio port. To enable a console via JTAG, define
+ CONFIG_CONSOLE_JTAG and set CGF_NIOS_CONSOLE to the base address
+ of the JTAG stdio port (normally OCI base + 0x00fa). Then
+ run nios-console with the -w option.
(standard-32: nasys_uart_0 resp. na_uart1_base).
CFG_NIOS_FIXEDBAUD -- defined if the console UART PTF fixed_baud
3. Release CFG_NIOS_CPU_BUTTON_PIO, button number 0.
-5. BRAIN DAMAGE
+5. DEBUGGING WITH GDB
+---------------------
+
+Debug sessions using gdb are currently supported only via JTAG. The
+stubs for debugging via a serial port are not implemented. To enable
+the gdb JTAG stubs, simply reference _brkpt_hw_int and _brkpt_sw_int
+at vector table offsets 3 and 4, respectively. For an example, see
+board/altera/dk1c20/vectors.S.
+
+5.1 Vector Table Initialization and ROM Stubs
+---------------------------------------------
+If CONFIG_ROM_STUBS is defined, the debug breakpoint and single step
+entries in the vector table are restored to their initial values
+immediately _after_ initializing the vector table. Defining this macro
+is useful when ROM-based stubs are implemented.
+
+NOTE: The default GERMS monitor does NOT implement gdb stubs, nor does
+it initialize the vector table. Therefore, when debugging U-Boot, you
+should NOT set a software breakpoint prior to vector table initialization.
+
+5.2 Starting a Debug Session
+----------------------------
+If you're not familiar with gdb, you follow these step-by-step instructions.
+These instructions are NOT the only way to start a debug session, but they
+cover most of the individual functions to get you started.
+
+ 1. Start the JTAG gdb server. Open a Nios shell window and start
+ the server. When the server is started you must provide the base
+ address of the OCI core. For example, when using the Cyclone
+ development kit (DK1C20):
+
+ $ nios-gdb-server --ocibase=0x00920800 --tcpport=2342
+
+ 2. Start gdb. Open a Nios shell window, change to the top-level
+ U-Boot directory and start gdb, specifying the u-boot elf file:
+
+ $ nios-elf-gdb u-boot
+
+ 3. Update target settings. From the file menu, select
+ "Target Settings ..." and select the following, then click 'Ok':
+
+ Target: Remote/TCP
+ Port : 2342 (same as in step 1)
+ Display download dialog: checked
+ All other check boxes: unchecked
+
+ 4. Connect to the target. Select menu: 'Run->Connect to target'.
+ You should see a dialog box indicating the you successfully connected
+ to the target.
+
+ 5. Download U-Boot. Select menu: 'Run->Download'.
+
+ 6. Open a gdb console window and set the source directory paths.
+ Select menu: 'View->Console'. In the console window, enter the
+ following commands, then close the console window:
+
+ (gdb) directory common
+ (gdb) directory cpu/nios
+ (gdb) directory lib_nios
+ (gdb) directory board/altera/dk1c20
+
+ Note that the last command is for the DK1C20 board only. If you
+ are using another board, specify that board's directory.
+
+ 7. Open the file board.c (using the file menu in the lower
+ left hand corner). Scroll to the board_init() routine and set
+ a breakpoint.
+
+ 8. Run U-Boot. Just click on the run icon, or select menu:
+ 'Run->Run'. U-Boot should start running, then break at your
+ breakpoint.
+
+ 9. Have fun & start learning more about gdb.
+
+
+5.3 For advanced Users
+----------------------
+A few notes for those more familiar with gdb.
+
+ -Serial port stubs are not implemented. Sorry, but it's just not
+ worth _my_ effort. The JTAG stubs work great and are ridiculously
+ simple to implement.
+
+ -If you need to debug the early startup code (prior to the vector
+ table initialization), use the nios-console debugger.
+
+ - Connect, download & run -- there are some problems here. Connect
+ download and run seperately to avoid trouble.
+
+6. BRAIN DAMAGE
----------------
This section describes some of the unfortunate and avoidable aspects
of working with the Nios CPU ... and some things you can do to
reduce your pain.
-5.1 GERMS doesn't work with Hyperterminal
+6.1 GERMS doesn't work with Hyperterminal
------------------------------------------
GERMS doesn't do CR/LF mapping that is compatible with Hyperterminal
(or minicom) -- geez. Regardless of you opion of Hyperterminal, this
sad design decision is remedied by using U-Boot.
-5.2 cygwin Incompatibility
+6.2 cygwin Incompatibility
---------------------------
The version of cygwin distributed with the nios GNUPro toolchain is
out-of-date and incompatible with the latest cygwin distributions.
The solution ... well, you can wait for Altera ... or build as
set of tools for linux.
-5.3 No native gcc
+6.3 No native gcc
------------------
I'm not sure how this one slipped through the cracks ... but it is
a real pain. Basically, if you want to build anything for the native
toolchain can it found in the CDK4NIOS project hosted by Source
Forge at http://cdk4nios.sourceforge.net.
-5.4 Can't build default U-Boot
+6.4 Can't build default U-Boot
-------------------------------
By default, when you build U-Boot you will be building some native
tools along with the target elf, bin, and srec files. Without a
-c -o $@ environment.c
With:
-environment.o: environment.c ../tools/envcrc
+environment.o: environment.c
$(CC) $(AFLAGS) -Wa,--no-warn \
-DENV_CRC=0 \
-c -o $@ environment.c
-BTW, thats a 'zero' ... not the letter 'O'.
+BTW, thats a 'zero' ... not the letter 'O'. And not that the
+"../tools/envcrc" dependency is removed.
-6. HELP WANTED
+7. HELP WANTED
---------------
There are plenty of areas where help is needed. Here's are some ideas
endif
ifeq ($(ARCH),nios)
-LOAD_ADDR = 0x01000000 -L $(gcclibdir)/m32 -T nios.lds
+LOAD_ADDR = 0x00800000 -L $(gcclibdir)/m32 -T nios.lds
endif
ifeq ($(ARCH),m68k)
CFG_CMD_MII | \
CFG_CMD_PCI | \
CFG_CMD_PCMCIA | \
+ CFG_CMD_REISER | \
CFG_CMD_SCSI | \
CFG_CMD_SPI | \
CFG_CMD_VFD | \
#define NIOS_ASMI_IEOP (1 << 9) /* rx eop int ena */
#define NIOS_ASMI_SSO (1 << 10) /* slave select enable */
+/*------------------------------------------------------------------------
+ * JTAG UART
+ *----------------------------------------------------------------------*/
+typedef volatile struct nios_jtag_t {
+ unsigned short rxcntl; /* Rx data/cntl reg */
+ unsigned short txcntl; /* Tx data/cntl reg */
+ unsigned short errcntl; /* Err dta/cntl reg */
+}nios_jtag_t;
+
+/* status register */
+#define NIOS_JTAG_TRDY (1 << 8) /* tx ready bit */
+#define NIOS_JTAG_RRDY (1 << 8) /* rx ready bit */
+
#endif /* __NIOSIO_H__ */
extern void malloc_bin_reloc (void);
typedef int (init_fnc_t) (void);
-extern unsigned _vectors[];
/*
* Begin and End of memory area for malloc(), and current "brk"
gd = (gd_t *)CFG_GBL_DATA_OFFSET;
memset( gd, 0, CFG_GBL_DATA_SIZE );
- /* Copy exception vectors to the correct location.
- */
- memcpy( (void *)CFG_VECT_BASE, _vectors, 256 );
-
gd->bd = (bd_t *)(gd+1); /* At end of global data */
gd->baudrate = CONFIG_BAUDRATE;
gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
# MA 02111-1307 USA
#
-PLATFORM_CPPFLAGS += -m32 -DCONFIG_NIOS -D__NIOS__ -ffixed-g7
+PLATFORM_CPPFLAGS += -m32 -DCONFIG_NIOS -D__NIOS__ -ffixed-g7 -gstabs
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