Re: [Qemu-devel] [PATCH] PPC: E500: Implement reboot controller

[Alexander Graf]

On 03.06.2011, at 19:00, Scott Wood wrote:

> On Thu, 2 Jun 2011 13:57:50 +0200
> Alexander Graf <address@hidden> wrote:
> 
>> diff --git a/pc-bios/mpc8544ds.dts b/pc-bios/mpc8544ds.dts
>> index 872152d..9b95bfd 100644
>> --- a/pc-bios/mpc8544ds.dts
>> +++ b/pc-bios/mpc8544ds.dts
>> @@ -82,6 +82,12 @@
>>                      compatible = "chrp,open-pic";
>>                      device_type = "open-pic";
>>              };
>> +
>> +                address@hidden {        //global utilities block
>> +                        compatible = "fsl,mpc8548-guts";
>> +                        reg = <0xe0000 0x1000>;
>> +                        fsl,has-rstcr;
>> +                };
>>      };
> 
> We're not providing a full mpc8548 (or mpc8544) guts, only the rstcr
> register.

Do you have any pointers to what the guts is?

> Currently Linux looks for a node with the name "global-utilities" and a
> property "fsl,has-rstcr", so there's no compatibility reason for a
> misleading compatible, either.
> 
> I'd go with compatible = "fsl,guts-rstcr" (what we've been using
> internally, and would be a nicer thing to bind against than what the
> kernel currently does).  Or if the goal is to provide more guts registers
> later, use "fsl,mpc8544-guts" and have qemu log a warning if other accesses
> are made.

What's the difference between the two revisions? Ideally, we should try to 
emulate real hardware, so implementing the real deal would certainly be the 
better option.


Alex