* [Qemu-devel] sparc32 SIMM size
@ 2009-08-22 20:17 Artyom Tarasenko
2009-08-22 22:33 ` [Qemu-devel] " Robert Reif
0 siblings, 1 reply; 2+ messages in thread
From: Artyom Tarasenko @ 2009-08-22 20:17 UTC (permalink / raw)
To: Robert Reif; +Cc: Blue Swirl, qemu-devel
> You have to be careful when specifing a memory size on
> the ss10/20 because a SIMM slot uses 64M reguardless of
> the actual size of the SIMM. A smaller size will be mirrored
> to fill the entire space and OBP checks for mirrioing to
> determine the actual size. QEMU doesn't do any mirroring
> for small SIMMS which will confuse OBP. I don't think
> that is the issue are seeing but just something to keep in mind.
It's not an issue for SS-10/20, but may be an issue for SS-5 and
below. SS-5 and earlier support maximal SIMM size of 32M. It doesn't
seem to be reflected in hw/sun4m.c .
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Qemu-devel] Re: sparc32 SIMM size
2009-08-22 20:17 [Qemu-devel] sparc32 SIMM size Artyom Tarasenko
@ 2009-08-22 22:33 ` Robert Reif
0 siblings, 0 replies; 2+ messages in thread
From: Robert Reif @ 2009-08-22 22:33 UTC (permalink / raw)
To: Artyom Tarasenko; +Cc: Blue Swirl, qemu-devel
Artyom Tarasenko wrote:
>> You have to be careful when specifing a memory size on
>> the ss10/20 because a SIMM slot uses 64M reguardless of
>> the actual size of the SIMM. A smaller size will be mirrored
>> to fill the entire space and OBP checks for mirrioing to
>> determine the actual size. QEMU doesn't do any mirroring
>> for small SIMMS which will confuse OBP. I don't think
>> that is the issue are seeing but just something to keep in mind.
>>
>
> It's not an issue for SS-10/20, but may be an issue for SS-5 and
> below. SS-5 and earlier support maximal SIMM size of 32M. It doesn't
> seem to be reflected in hw/sun4m.c .
>
>
Look on page 71 Appendex AII Campus 2 (SS10) of the
Sun4m System Architecture manual for an explanation:
http://wikis.sun.com/display/FOSSdocs/Home
^ permalink raw reply [flat|nested] 2+ messages in thread
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