Re: [microblaze-uclinux] OT?, Performance

[David McCullough <davidm@xxxxxxxxxxxx>]

Jivin John Williams lays it down ...
> emanuel stiebler wrote:
> >Goran Bilski wrote:
> >
> >>Another way to improve the numbers is to use the harvard architecute 
> >>of MicroBlaze and have 2 OPB busses and two external memories.
> >
> >
> >But we can't support it on the uclinux ...
> 
> That's not strictly true...  it would just require some (major?) work in 
> the kernel, to support two memory pools - one for data, and one for 
> code, and in the hardware we'd instantiate bridges so that we are able 
> to write into code space.
> 
> Not trivial, but certainly doable I think.

page_alloc2 in the 2.4 kernel can currently manage 2 pools of memory,
uses a GFP_SPECIAL flag to allocate from the "special" pool ;-)

I didn't write it,  but I think it was a hack to allow access to fast
SRAM on some platforms.

Cheers,
Davidm

-- 
David McCullough, davidm@snapgear.com  Ph:+61 7 34352815 http://www.SnapGear.com
Custom Embedded Solutions + Security   Fx:+61 7 38913630 http://www.uCdot.org
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