[LinuxBIOS] RAM controller breakage?
segher at kernel.crashing.org
Sun Nov 12 00:54:19 CET 2006
> 1) I found in my testing that you can do things to the north bridge
> will crash it in such a way that a reset does not fully fix. It's
> sneaky, things just start behaving really weird and your code just
> to start failing for no good reason. But not so bad as to suspect
> its hardware. Especially if you are doinking with the register
> at the time.
> The only fix is to _remove_ power from the board.
Many chips have debug registers (often not documented in
public literature) that seriously change the behaviour
of the chip; and such debug registers are often not reset
by a simple chip reset (which is a good thing really).
Most shipping hardware (esp. "B" or later revs) doesn't
need programming any of those registers for proper
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