[Skiboot] [PATCH] Disable stop states from OPAL

Stewart Smith stewart at linux.ibm.com
Thu Apr 12 16:24:05 AEST 2018

Stewart Smith <stewart at linux.ibm.com> writes:
> On ZZ, stop4,5,11 are enabled for PHYP, even though doing
> so may cause problems with OPAL due to bugs in hcode.
> For other platforms, this isn't so much of an issue as
> we can just control stop states by the MRW. However the
> rebuild-the-world approach to changing values there is a bit
> annoying if you just want to rule out a specific stop state
> from being problematic.
> Provide an nvram option to override what's disabled in OPAL.
> The OPAL mask is currently ~0xE0000000 (i.e. all but stop 0,1,2)
> You can set an NVRAM override with:
>   nvram -p ibm,skiboot --update-config opal-stop-state-disable-mask=0xFFFFFFF
> This will disable *all* stop states.
> Signed-off-by: Stewart Smith <stewart at linux.ibm.com>
> ---
>  hw/slw.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)

Merged to master as of 217e5a4ecbfab8e88b6e250d5d8fdfe502cfe5da

Stewart Smith
OPAL Architect, IBM.

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