x86: Add support for running Intel reference code

Intel has invented yet another binary blob which firmware is required to
run. This is run after SDRAM is ready. It is linked to load at a particular
address, typically 0, but is a relocatable ELF so can be moved if required.

Add support for this in the build system. The file should be placed in the
board directory, and called refcode.elf.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/Makefile b/Makefile
index 8505bccfa1b1fd0e45d3593d35bfde6703b92065..53569e8089f2cdfe1959cbb586a07c43094d99c4 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1052,6 +1052,10 @@ ifneq ($(CONFIG_HAVE_VGA_BIOS),)
 IFDTOOL_FLAGS += -w $(CONFIG_VGA_BIOS_ADDR):$(srctree)/board/$(BOARDDIR)/$(CONFIG_VGA_BIOS_FILE)
 endif
 
+ifneq ($(CONFIG_HAVE_REFCODE),)
+IFDTOOL_FLAGS += -w $(CONFIG_X86_REFCODE_ADDR):refcode.bin
+endif
+
 quiet_cmd_ifdtool = IFDTOOL $@
 cmd_ifdtool  = $(IFDTOOL) -c -r $(CONFIG_ROM_SIZE) u-boot.tmp;
 ifneq ($(CONFIG_HAVE_INTEL_ME),)
@@ -1060,7 +1064,15 @@ endif
 cmd_ifdtool += $(IFDTOOL) $(IFDTOOL_FLAGS) u-boot.tmp;
 cmd_ifdtool += mv u-boot.tmp $@
 
-u-boot.rom: u-boot-x86-16bit.bin u-boot.bin FORCE
+refcode.bin: $(srctree)/board/$(BOARDDIR)/refcode.bin FORCE
+       $(call if_changed,copy)
+
+quiet_cmd_ldr = LD      $@
+cmd_ldr = $(LD) $(LDFLAGS_$(@F)) \
+              $(filter-out FORCE,$^) -o $@
+
+u-boot.rom: u-boot-x86-16bit.bin u-boot.bin FORCE \
+               $(if $(CONFIG_HAVE_REFCODE),refcode.bin)
        $(call if_changed,ifdtool)
 
 OBJCOPYFLAGS_u-boot-x86-16bit.bin := -O binary -j .start16 -j .resetvec

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 64c824f7172a9a74e84bf39e62a0ea5c181160c6..1a9fa400812e521ea49311d4802b45b9532cb4f8 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -327,6 +327,17 @@ config DCACHE_RAM_MRC_VAR_SIZE
          memory reference code and must be set correctly or the board will
          not boot.
 
+config HAVE_REFCODE
+        bool "Add a Reference Code binary"
+        help
+          Select this option to add a Reference Code binary to the resulting
+          U-Boot image. This is an Intel binary blob that handles system
+          initialisation, in this case the PCH and System Agent.
+
+          Note: Without this binary (on platforms that need it such as
+          broadwell) U-Boot will be missing some critical setup steps.
+          Various peripherals may fail to work.
+
 config SMP
        bool "Enable Symmetric Multiprocessing"
        default n

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 85386da47a047db176860653a5e568483f6467b3..789275792ffb8a1bc77f2eaeeb8a38fdc0a906d8 100644 (file)
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -275,4 +275,16 @@ u32 cpu_get_family_model(void);
  */
 u32 cpu_get_stepping(void);
 
+/**
+ * cpu_run_reference_code() - Run the platform reference code
+ *
+ * Some platforms require a binary blob to be executed once SDRAM is
+ * available. This is used to set up various platform features, such as the
+ * platform controller hub (PCH). This function should be implemented by the
+ * CPU-specific code.
+ *
+ * @return 0 on success, -ve on failure
+ */
+int cpu_run_reference_code(void);
+
 #endif