diff options
author | Simon Glass <sjg@chromium.org> | 2015-01-27 22:13:32 -0700 |
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committer | Simon Glass <sjg@chromium.org> | 2015-02-05 22:16:43 -0700 |
commit | eea0f11278d9104960dfb1fbfcddfb796a3e0bb5 (patch) | |
tree | a7bc1309e894bc9e56eaec6f0aedc3bfa34f562a /doc/README.x86 | |
parent | 316328f59d5bb64ed8ab70b68edb434cae70ee58 (diff) |
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>
Diffstat (limited to 'doc/README.x86')
-rw-r--r-- | doc/README.x86 | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/doc/README.x86 b/doc/README.x86 index 7df8cc516a..ddfd75e1cd 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -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. |