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Commit b5843032 authored by Borislav Petkov's avatar Borislav Petkov Committed by Ingo Molnar
Browse files

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: default avatarThomas Voegtle <tv@lio96.de>
Signed-off-by: default avatarBorislav 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: default avatarIngo Molnar <mingo@kernel.org>
parent f7eb59dd

Documentation/x86/early-microcode.txt

+25 −0
Original line number Diff line number Diff line
@@ -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.