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Date: Wed, 26 Mar 2003 23:23:54 -0500
From: David Ford <david+cert@blue-labs.org>
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Subject: 2.5.66 buglet
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<boot dmesg snip>
devfs_register(cpu/microcode): illegal mode: 8180
</snip>

# ls /dev/cpu
# grep -i microcode /boot/2.5.66/.config
CONFIG_MICROCODE=y

Not sure how it breaks between .64 where it worked and .66 where it 
doesn't.  The code where it's registered doesn't appear to have changed. 
arch/i386/kernel/microcode.c, line 137.

david