path: root/Documentation/x86
diff options
authorJacob Shin <jacob.shin@amd.com>2013-05-30 14:09:19 -0500
committerH. Peter Anvin <hpa@linux.intel.com>2013-05-30 20:19:25 -0700
commit757885e94a22bcc82beb9b1445c95218cb20ceab (patch)
tree1cda49972f875326d47d1e140e190b7a1e9095d3 /Documentation/x86
parenta76096a6571d5389376753c2e18b30a9791fa072 (diff)
x86, microcode, amd: Early microcode patch loading support for AMD
Add early microcode patch loading support for AMD. Signed-off-by: Jacob Shin <jacob.shin@amd.com> Link: http://lkml.kernel.org/r/1369940959-2077-5-git-send-email-jacob.shin@amd.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com>
Diffstat (limited to 'Documentation/x86')
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:
+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

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