Re: [PATCH 1/8] pseries: phyp dump: Docmentation

On 09/01/2008, Michael Ellerman [off-list ref] wrote:

quoted

quoted

Only if you can get at rtas, but you can't get at rtas at that point.

AFAICT you don't need to get at RTAS, you just need to look at the
device tree to see if the property is present, and that is trivial.

You probably just need to add a check in early_init_dt_scan_rtas() which
sets a flag for the PHYP dump stuff, or add your own scan routine if you
need.

I no longer remember the details. I do remember spending a lot of time
trying to figure out how to do this. I know I didn't want to write my own scan
routine; maybe that's what stopped me.  As it happens, we also did most
of the development on a broken phyp which simply did not even have
this property, no matter what, and so that may have brain-damaged me.

I went for the "most elegant" solution, where "most elegant" is defined
as "fewest lines of code", "least effort", etc.

Manish may need some hands-on help to extract this token during
early boot.  Hopefully, he'll let us know.

--linas