x86: Add an option to enabling building a ROM file
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>utp
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Makefile
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Makefile
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@ -729,8 +729,9 @@ ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
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endif
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endif
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ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
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ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
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# We can't do this yet due to the need for binary blobs
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ifneq ($(BUILD_ROM),)
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# ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
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ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
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endif
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# enable combined SPL/u-boot/dtb rules for tegra
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# enable combined SPL/u-boot/dtb rules for tegra
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ifneq ($(CONFIG_TEGRA),)
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ifneq ($(CONFIG_TEGRA),)
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@ -51,9 +51,11 @@ Building ROM version of U-Boot (hereafter referred to as u-boot.rom) is a
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little bit tricky, as generally it requires several binary blobs which are not
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little bit tricky, as generally it requires several binary blobs which are not
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shipped in the U-Boot source tree. Due to this reason, the u-boot.rom build is
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shipped in the U-Boot source tree. Due to this reason, the u-boot.rom build is
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not turned on by default in the U-Boot source tree. Firstly, you need turn it
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not turned on by default in the U-Boot source tree. Firstly, you need turn it
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on by uncommenting the following line in the main U-Boot Makefile:
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on by enabling the ROM build:
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# ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
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$ export BUILD_ROM=y
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This tells the Makefile to build u-boot.rom as a target.
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Link-specific instructions:
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Link-specific instructions:
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@ -126,11 +128,11 @@ Make sure 0x1110000 matches CONFIG_SYS_TEXT_BASE and 0x1110015 matches the
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symbol address of _start (in arch/x86/cpu/start.S).
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symbol address of _start (in arch/x86/cpu/start.S).
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If you want to use ELF as the coreboot payload, change U-Boot configuration to
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If you want to use ELF as the coreboot payload, change U-Boot configuration to
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use CONFIG_OF_EMBED.
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use CONFIG_OF_EMBED instead of CONFIG_OF_SEPARATE.
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CPU Microcode
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CPU Microcode
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-------------
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-------------
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Modern CPU usually requires a special bit stream called microcode [5] to be
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Modern CPUs usually require a special bit stream called microcode [5] to be
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loaded on the processor after power up in order to function properly. U-Boot
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loaded on the processor after power up in order to function properly. U-Boot
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has already integrated these as hex dumps in the source tree.
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has already integrated these as hex dumps in the source tree.
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