Re: [Qemu-devel] [Qemu-ppc] [PATCH 2/2] Add Enhanced Three-Speed Ethernet Controller (eTSEC)

[Fabien Chouteau]

On 07/17/2013 10:29 AM, Alexander Graf wrote:
> 
> 
> Am 17.07.2013 um 10:24 schrieb Fabien Chouteau <address@hidden>:
> 
>> On 07/16/2013 06:54 PM, Scott Wood wrote:
>>> On 07/16/2013 11:15:51 AM, Fabien Chouteau wrote:
>>>> On 07/16/2013 05:37 PM, Alexander Graf wrote:
>>>>> On 07/16/2013 05:28 PM, Fabien Chouteau wrote:
>>>>>> On 07/16/2013 04:06 AM, Scott Wood wrote:
>>>>>>> On 07/10/2013 12:10:02 PM, Fabien Chouteau wrote:
>>>>>>>> +    /* ring_base = (etsec->regs[RBASEH].value&  0xF)<<  32; */
>>>>>>>> +    ring_base     += etsec->regs[RBASE0 + ring_nbr].value&  ~0x7;
>>>>>>>> +    start_bd_addr  = bd_addr = etsec->regs[RBPTR0 + ring_nbr].value&  
>>>>>>>> ~0x7;
>>>>>>> What about RBDBPH (upper bits of physical address)?  Likewise for TX.
>>>>>> I'm only interested in 32bits address spaces, so RBASEH, TBASEH, RBDBPH 
>>>>>> or TBDBPH.
>>>>>
>>>>> Why? I thought e500mc and above can access more than 32bits of physical 
>>>>> address space?
>>>>
>>>> Yes but this is not emulated by QEMU, right? sizeof (hwaddr) for
>>>> qemu-system-ppc is 8...
>>>
>>> 36bit physical is emulated by QEMU.  Currently we put CCSR in a place that 
>>> would make it difficult to use memory above 4G, but that should change at 
>>> some point.
>>
>>
>> But hwaddr is 32 bits, how could you call cpu_physical_memory_read()? to
>> a 36bits address?
> 
> 8 x 8 = 64, no? :)
> 

Oups, I was so sure of myself :)

-- 
Fabien Chouteau