[Skiboot] [PATCH v4] platform: add Raptor Blackbird support

[Stewart Smith]

On Thu, Apr 9, 2020, at 12:19 AM, Dan Horák wrote:
> On Wed,  8 Apr 2020 23:12:50 -0700
> Stewart Smith <stewart at flamingspork.com> wrote:
> 
> > Based off the Raptor patch:
> > https://git.raptorcs.com/git/blackbird-skiboot/commit/?id=c81f9d66592dc2a7cf7f6c59c3def5cee0638c1f
> > 
> > Notable changes:
> > - slot names matching what's silkscreened on the board
> > - Expose IPL Observer over op-panel OPAL calls
> > 
> >   This means you can "printf '\xfe\xfe\xfe' > /dev/op_panel" to
> >   make the IPL Observer on the Raptor BMC builds to realise it
> >   can turn on fan control.
> > 
> > Signed-off-by: Stewart Smith <stewart at flamingspork.com>
> 
> I like it. Is there any drawback when you write to all 3 addresses
> (0x80..0x82) as opposed to the original observer that uses only 0x81,
> 0x82?

the 0x80 is the "standard" (as in, since the original IBM PC) one. The 81,82 came from the "more than 8 bits of status is useful" discussion we (at least Tim and myself, plus others, I can't remember, it's late) had... oh I can't remember now... but a while ago. Our bigger concern was if writing to 81,82 was going to be okay if nothing was listening.