[BUG] Kernel panic - not syncing: VFS

["charles gagalac" <charles.gagalac@gmail.com>]

i'm getting the following kernel panic when booting:

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

a bisect generated the commit below:

3320ad994afb2c44ad34b3b34c3c5cf0da297331 is first bad commit
commit 3320ad994afb2c44ad34b3b34c3c5cf0da297331
Author: dean gaudet
Date:   Fri Aug 10 22:30:59 2007 +0200

    x86: Work around mmio config space quirk on AMD Fam10h

    Some broken devices have been discovered to require %al/%ax/%eax registers
    for MMIO config space accesses.  Modify mmconfig.c to use these registers
    explicitly (rather than modify the global readb/writeb/etc inlines).

    AK: also changed i386 to always use eax
    AK: moved change to extended space probing to different patch
    AK: reworked with inlines according to Linus' requirements.
    AK: improve comments.
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