[PATCH 2/2] ssb: Save sprom image for dump of device at alternate location

[Michael Büsch]

On Sun, 2010-12-12 at 09:34 -0600, Larry Finger wrote: 
> On 12/12/2010 02:45 AM, Michael Büsch wrote:
> > On Sat, 2010-12-11 at 21:35 -0600, Larry Finger wrote: 
> >> Some recent Broadcom devices in netbooks have an SPROM that is located
> >> at 0x0800, not the normal location of 0x1000. Initial reading of the
> >> SPROM has been solved in a previous commit; however, dumping to a console
> >> no longer works. This difficulty is fixed by saving the SPROM image
> >> from the initial read, and only freeing that memory at module unload.
> > 
> > Ah wait. Now I get what you were talking about.
> > Yes, those devices map the SPROM into the wireless core window.
> > So, yes, the wireless core has to be mapped for the readout to work,
> > of course. I don't know what other prerequisites have to be met to
> > read the data. Maybe IHR region has to be disabled.
> > I don't know how writing works on these devices.
> 
> I do not think it is worthwhile to bother to find out how to rewrite the SPROM.
> As long as we can read it in case of questions regarding content, that should be
> enough. In V2, I will return -ENOTSUP rather than -EINVAL as that is more
> appropriate.

So, do we actually make sure the wireless core is mapped while reading
SPROM from offset 0x800? I guess not and it just works by accident,
because the core is still mapped from a previous operation.

-- 
Greetings Michael.