Re: PR 36158 (>256MB in O2)

[Matt Thomas <matt%3am-software.com@localhost>]

On Mar 3, 2013, at 6:32 AM, Michael <macallan1888%gmail.com@localhost> wrote:

> Hello,
> 
> On Sun, 3 Mar 2013 09:21:09 +0100
> Martin Husemann <martin%duskware.de@localhost> wrote:
> 
>> Out of curiosity:
>> what is missing now for a N64 kernel? I had the impression other mips archs
>> do that now, so it can not be too much.
>> 
>> Martin
>> (I need to fix the rtc in my O2 and try)
> 
> Older MIPS CPUs ( not sure if it's all of them or just R5k and the like ) 
> have some cache issues ( and had them for a long time, the last working 
> kernel/userland I have is 5.99.17 vintage ) - corruption happens when data 
> gets moved between processes. I don't see this on Loongson hardware although 
> there's still corruption on NFS writes ( not sure if that's the same issue 
> though )
> Otherwise, N32 kernels with N32 userlands work more or less. I didn't try N64 
> on my O2 yet but I'd expect some trouble ( kseg vs. xphys, assumptions about 
> LP32 etc. )

I think my latest commit to bus_dma.c should fix the NFS problems and maybe 
others.