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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:28:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 16:28:10 -0700
commitfdd78889aad2ec85b2f5a8ed232215dca7a22a3b (patch)
treed99e66e9afe26bebf89204d15443c42b9345bc21 /Documentation
parentd652df0b2f0b9c2e655be0d6f90989fae0a511b4 (diff)
parent9608d33b8210c993af4430d661a6474946480c9b (diff)
Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 microcode loading update from Ingo Molnar: "Two main changes that improve microcode loading on AMD CPUs: - Add support for all-in-one binary microcode files that concatenate the microcode images of multiple processor families, by Jacob Shin - Add early microcode loading (embedded in the initrd) support, also by Jacob Shin" * 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, microcode, amd: Another early loading fixup x86, microcode, amd: Allow multiple families' bin files appended together x86, microcode, amd: Make find_ucode_in_initrd() __init x86, microcode, amd: Fix warnings and errors on with CONFIG_MICROCODE=m x86, microcode, amd: Early microcode patch loading support for AMD x86, microcode, amd: Refactor functions to prepare for early loading x86, microcode: Vendor abstract out save_microcode_in_initrd() x86, microcode, intel: Correct typo in printk
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/x86/early-microcode.txt11
1 files changed, 5 insertions, 6 deletions
diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt
index 4aaf0dfb0cb8..d62bea6796da 100644
--- a/Documentation/x86/early-microcode.txt
+++ b/Documentation/x86/early-microcode.txt
@@ -11,7 +11,8 @@ file and loaded to CPUs during boot time.
The format of the combined initrd image is microcode in cpio format followed by
the initrd image (maybe compressed). Kernel parses the combined initrd image
during boot time. The microcode file in cpio name space is:
-kernel/x86/microcode/GenuineIntel.bin
+on Intel: kernel/x86/microcode/GenuineIntel.bin
+on AMD : kernel/x86/microcode/AuthenticAMD.bin
During BSP boot (before SMP starts), if the kernel finds the microcode file in
the initrd file, it parses the microcode and saves matching microcode in memory.
@@ -34,10 +35,8 @@ original initrd image /boot/initrd-3.5.0.img.
mkdir initrd
cd initrd
-mkdir kernel
-mkdir kernel/x86
-mkdir kernel/x86/microcode
-cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin
-find .|cpio -oc >../ucode.cpio
+mkdir -p kernel/x86/microcode
+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