Per chi come me si � dannato senza saper la causa:
ChangeSet@xxxxxx, 2004-03-13 19:26:39-08:00, akpm@xxxxxxxx
[PATCH] Work around an AMD768MPX erratum
From: Andi Kleen <ak@xxxxxxx>
This patch has been in the SuSE 2.4 kernel forever, but for some
reason
never made it mainline.
It works around the infamous "only works stable when a mouse is
plugged in"
problem some AMD 768MPX Dual Athlon chipsets have. The
problem happens
because the chipset can hang when PCI prefetch strides from
a RAM page into
the VGA text buffer. When a PS2 mouse is plugged in the
BIOS reserves a
page before the VGA text buffer, which stops the
prefetch early.
This patch always reserves this page when the
chipset could be AMD768MPX.
This can be only done early in bootmem setup.
Because it's difficult to
scan the PCI bus that early it just always
reserves this page when the CPU
is an Athlon. Normally it should not make a
difference because the BIOS
will have reserved that page anyways when a
PS/2 mouse is plugged in.
--
'' � Starving wolves at the gates of civilization.
' ' linux User 231984.
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