[Skiboot] [PATCH v2 09/12] opal: Inform fsp about the topology switch.

[Stewart Smith]

Mahesh J Salgaonkar <mahesh at linux.vnet.ibm.com> writes:
> From: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
>
> After the topology switch, we may have a non-functional backup topology.
> This means, we won't be able to recover from future TOD errors that
> requires topology switch. Someone needs to either fix it OR configure
> new functional backup topology.
>
> Bit 18 of the Pervasive local FIR (SCOM: EH.TPCHIP.TPC.LOCAL_FIR: 0x0104000C)
> is used to signal that TOD error analysis needs to be performed. This
> allows FSP/PRD to investigate and re-configure new backup topology if
> required. Once new backup topology is configured and ready, FSP sends a
> mailbox command xE6, s/c 0x06, mod 0, to enable the backup topology.
>
> This isn't documented anywhere. This info is provided by FSP folks.
>
> This patch implements setting of bit 18 in Pervasive local FIR. The next
> patch will handle FSP mailbox command xE6, s/c 0x06, mod 0.

What should we do on OpenPower? Should this be something we signal
opal-prd to deal with?

I'm okay with merging this as is, but would like to know what we should
do on OpenPower if we want to handle this case.