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| author | Borislav Petkov <bp@suse.de> | 2016-02-03 14:33:45 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-02-09 13:41:19 +0300 |
| commit | b584303261b7041f209afde4bf7ddb7a21598a1f (patch) | |
| tree | 5607b7d4e3d9903b6c9f90cda40a6f023463ec9c /Documentation/x86 | |
| parent | f7eb59dda129e46be5e195a46bfd0dde76db9bbd (diff) | |
| download | linux-b584303261b7041f209afde4bf7ddb7a21598a1f.tar.xz | |
x86/microcode: Document builtin microcode loading method
Add some text and an example to Documentation/x86/early-microcode.txt
explaining how to build in microcode.
Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-18-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/x86')
| -rw-r--r-- | Documentation/x86/early-microcode.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt index d62bea6796da..c956d99cf1de 100644 --- a/Documentation/x86/early-microcode.txt +++ b/Documentation/x86/early-microcode.txt @@ -40,3 +40,28 @@ cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin (or AuthenticAMD.bin) find . | cpio -o -H newc >../ucode.cpio cd .. cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img + +Builtin microcode +================= + +We can also load builtin microcode supplied through the regular firmware +builtin method CONFIG_FIRMWARE_IN_KERNEL. Here's an example: + +CONFIG_FIRMWARE_IN_KERNEL=y +CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin" +CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware" + +This basically means, you have the following tree structure locally: + +/lib/firmware/ +|-- amd-ucode +... +| |-- microcode_amd_fam15h.bin +... +|-- intel-ucode +... +| |-- 06-3a-09 +... + +so that the build system can find those files and integrate them into +the final kernel image. The early loader finds them and applies them. |