Commit-ID: b584303261b7041f209afde4bf7ddb7a21598a1f Gitweb: http://git.kernel.org/tip/b584303261b7041f209afde4bf7ddb7a21598a1f Author: Borislav Petkov <b...@suse.de> AuthorDate: Wed, 3 Feb 2016 12:33:45 +0100 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 9 Feb 2016 11:41:19 +0100
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 <t...@lio96.de> Signed-off-by: Borislav Petkov <b...@suse.de> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/1454499225-21544-18-git-send-email...@alien8.de Signed-off-by: Ingo Molnar <mi...@kernel.org> --- Documentation/x86/early-microcode.txt | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt index d62bea6..c956d99 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.
