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Date:	Fri, 18 Jul 2014 20:40:42 +0000
From:	Conrad Kostecki <ck@...rad-kostecki.de>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Early microcode not being loaded

Hi!
I'am trying to use the feature of loading early an intel microcode.
According to the documentation (early-microcode.txt) that should be possible.

I am currently using my own initrd, so I've created a second one, as the docs specified and merged it with my own.

Galactica linux # file /tmp/ucode.cpio
/tmp/ucode.cpio: ASCII cpio archive (SVR4 with no CRC)

Galactica linux # file /tmp/my_own_initrd.cpio
/tmp/my_own_initrd.cpio: ASCII cpio archive (SVR4 with no CRC)

Galactica linux #  cpio -itv < /tmp/ucode.cpio
drwxr-xr-x   3 root     root            0 Jul 18 17:01 .
drwxr-xr-x   3 root     root            0 Jul 18 17:01 kernel
drwxr-xr-x   3 root     root            0 Jul 18 17:01 kernel/x86
drwxr-xr-x   2 root     root            0 Jul 18 17:01 kernel/x86/microcode
-rw-r--r--   1 root     root      1857432 Jul 18 17:01 kernel/x86/microcode/GenuineIntel.bin

Galactica tmp # cpio -itv < /tmp/my_own_initrd.cpio
drwxr-xr-x  11 root     root            0 Jul 18 22:33 .
drwxr-xr-x   3 root     root            0 Jul 18 22:33 mnt
drwxr-xr-x   2 root     root            0 Jul 18 22:33 mnt/root
drwxr-xr-x   2 root     root            0 Jul 18 22:33 lib64
drwxr-xr-x   2 root     root            0 Jul 18 22:33 etc
drwxr-xr-x   2 root     root            0 Jul 18 22:33 sys
drwxr-xr-x   2 root     root            0 Jul 18 22:33 bin
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/ash -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/cat -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/loadkmap -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/cut -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/setfont -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/kbd_mode -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/echo -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/umount -> /bin/busybox
-rwxr-xr-x   1 root     root      2638208 Jul 18 22:33 bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/mount -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/mdev -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/sleep -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 bin/printf -> /bin/busybox
drwxr-xr-x   3 root     root            0 Jul 18 22:33 usr
drwxr-xr-x   2 root     root            0 Jul 18 22:33 usr/bin
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 usr/bin/setfont -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 usr/bin/kbd_mode -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 usr/bin/printf -> /bin/busybox
drwxr-xr-x   3 root     root            0 Jul 18 22:33 dev
crw-r--r--   1 root     root       5,   1 Jul 18 22:33 dev/console
crw-r--r--   1 root     root       4,  64 Jul 18 22:33 dev/ttyS0
crw-r--r--   1 root     root       1,   3 Jul 18 22:33 dev/null
crw-r--r--   1 root     root       1,   5 Jul 18 22:33 dev/zero
drwxr-xr-x   2 root     root            0 Jul 18 22:33 proc
-rwxr-xr-x   1 root     root         5707 Jul 18 22:33 init
lrwxrwxrwx   1 root     root            5 Jul 18 22:33 lib -> lib64
drwxr-xr-x   2 root     root            0 Jul 18 22:33 sbin
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 sbin/loadkmap -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 sbin/switch_root -> /bin/busybox
lrwxrwxrwx   1 root     root           12 Jul 18 22:33 sbin/mdev -> /bin/busybox
5174 blocks

Then I merged them, as the docs say:
cat /tmp/ucode.cpio /tmp/my_own_initrd.cpio > /boot/initramfs-3.15.5.img

Booting works fine with this combined initrd, but there is no new microcode applied.

[    1.058641] microcode: CPU0 sig=0x20661, pf=0x2, revision=0x104
[    1.063259] microcode: CPU1 sig=0x20661, pf=0x2, revision=0x104
[    1.068011] microcode: Microcode Update Driver: v2.00 <tigran@...azian.fsnet.co.uk>, Peter Oruba

It's only applied much later, when my microcode_ctl runs as a service.

[   15.764517] microcode: CPU0 sig=0x20661, pf=0x2, revision=0x104
[   15.764979] microcode: CPU0 updated to revision 0x105, date = 2011-07-18
[   15.765970] microcode: CPU1 sig=0x20661, pf=0x2, revision=0x104
[   15.766430] microcode: CPU1 updated to revision 0x105, date = 2011-07-18

Where is the problem? Why is the microcode not being loaded early?

Cheers
Conrad
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