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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>
This commit is contained in:
Simon Glass 2016-03-11 22:07:16 -07:00 committed by Bin Meng
parent 779653b0cb
commit 0adf8d3548
3 changed files with 36 additions and 1 deletions
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14
Makefile
View File

@ -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

11
arch/x86/Kconfig
View File

@ -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

12
arch/x86/include/asm/cpu.h
View File

@ -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