[parisc-linux] 720 - some progress

[Jurij Smakov]

> A quick glance at arch/parisc/hardware/inventory.c reveiled the
> following:
> 
> long status;
> unsigned int bus_id;
> ...
> status = pdc_model_info(&model);
> bus_id = (model.hversion >> (4 + 7)) & 0x1f;
> 
> switch (bus_id) {
> case 0x4:               /* 720, 730, 750, 735, 755 */
> 
> I don't know if all these models have the same CPU. I'm guessing not.
> 
> I also see a parisc_get_cpu_type(...) in arch/parisc/kernnel/hardware.c.
> This is probably what you want.
> 
> Regards,
> 
> Albert

Hi Albert!

As Matthew pointed out, it is not neccessary to determine the CPU type.
"Normal" (newer) CPU's do not consider reading from cr26 and cr27 to
be privileged operations, so the condition, which is checked in the
patch will just never occur for them. Actually, did you try it? I'm
very interested in the results.

Cheers,

Jurij.