On 04/26/2013 01:59:10 AM, Alexander Graf wrote:
On 26.04.2013, at 08:51, Bhushan Bharat-R65777 wrote:
>
>
>> -----Original Message-----
>> From: Alexander Graf [mailto:ag...@suse.de]
>> Sent: Friday, April 26, 2013 11:51 AM
>> To: Bhushan Bharat-R65777
>> Cc: qemu-...@nongnu.org; qemu-devel@nongnu.org; Wood Scott-B07421;
Bhushan
>> Bharat-R65777; Yoder Stuart-B08248
>> Subject: Re: [PATCH] ppc: initialize GPRs as per epapr
>>
>>
>> On 26.04.2013, at 08:17, Bharat Bhushan wrote:
>>
>>> ePAPR defines the initial values of cpu registers. This patch
>>> initialize the GPRs as per ePAPR specification.
>>>
>>> This resolves the issue of guest reboot/reset (guest hang on
reboot).
>>
>> Why does it hang only on reboot, not on initial bootup?
>
> may be memory pointed by env pointer are zero initialized initially.
> Reboot also not always hangs. I have seen reboot mostly working on
e500v2/e500mc and mostly hanging on e5500.
Yes, they're all zero initialized. I'm surprised that got things
working.
head_64.S assumes it's being booted from Open Firmware if r5 is
non-zero -- this is why ePAPR requires r5 to be zero.
-Scott
