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x86: Add an option to enabling building a ROM file

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Rather than requiring the Makefile to be modified, provide a build option to
enable the ROM to be built.

We cannot do this by default since it requires binary blobs. Without these
the build will fail.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-01-27 22:13:32 -07:00
parent 316328f59d
commit eea0f11278
2 changed files with 9 additions and 6 deletions

5
Makefile
View file

@ -729,8 +729,9 @@ ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
endif
ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
# We can't do this yet due to the need for binary blobs
# ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
ifneq ($(BUILD_ROM),)
ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
endif
# enable combined SPL/u-boot/dtb rules for tegra
ifneq ($(CONFIG_TEGRA),)

10
doc/README.x86
View file

@ -51,9 +51,11 @@ Building ROM version of U-Boot (hereafter referred to as u-boot.rom) is a
little bit tricky, as generally it requires several binary blobs which are not
shipped in the U-Boot source tree. Due to this reason, the u-boot.rom build is
not turned on by default in the U-Boot source tree. Firstly, you need turn it
on by uncommenting the following line in the main U-Boot Makefile:
on by enabling the ROM build:
# ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
$ export BUILD_ROM=y
This tells the Makefile to build u-boot.rom as a target.
Link-specific instructions:
@ -126,11 +128,11 @@ Make sure 0x1110000 matches CONFIG_SYS_TEXT_BASE and 0x1110015 matches the
symbol address of _start (in arch/x86/cpu/start.S).
If you want to use ELF as the coreboot payload, change U-Boot configuration to
use CONFIG_OF_EMBED.
use CONFIG_OF_EMBED instead of CONFIG_OF_SEPARATE.
CPU Microcode
-------------
Modern CPU usually requires a special bit stream called microcode [5] to be
Modern CPUs usually require a special bit stream called microcode [5] to be
loaded on the processor after power up in order to function properly. U-Boot
has already integrated these as hex dumps in the source tree.