Reset cause API
Ben Warren
bwarren at qstreams.com
Fri Mar 9 02:20:56 EST 2007
Thanks Chris & Kumar,
--- alayrac <christophe.alayrac at cresitt.com> wrote:
> The type of reset is recorded in the most-recent
> reset field of the
> debug-status register (DBSR[MRR]). System software
> can examine this
> field if it needs to determine the cause of a reset.
> The effect of a
> reset on the processor is always the same regardless
> of the type.
>
> For more details you can see ppc-ref-guide.pdf (in
> EDK doc directory).
> Chris
The Freescale SoCs also have a Reset Status Register
(RSR) than contains the same kind of information. I
wa s curious whether a system call exists or whether I
need to write my own.
What I'm really interested in knowing is whether the
last boot was cold(hard) or warm(soft). The type of
products I work on have devices that must only be
initialized on a cold boot, to avoid affecting the
data path.
regards,
Ben
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