Geode GX1 and IRQ tables

[Ian Smith]

Ramesh,

At 04:02 02/03/2005, ramesh bios wrote:
>1. Shadow RAM
>
>I guess I would need to find a way to tell the
>northbridge to enable shadow RAM for some range around
>f0000. I looked through the CS5530A datasheet and see
>shadow registers but no mention of shadowing RAM. Nor
>in the GX1 datasheet either. I'm looking for some
>register in either the GX1 or the CS5530A that would
>enable this. I am looking for some register that would
>enable me to remap the C0000-F0000 address range to
>somewhere in sdram. Is that the right thing to be
>looking for?

I think you may need to look at your settings for the BC_XMAP_2 and 
BC_XMAP_3 registers on the GX1 - these control read and write access to the 
BIOS shadow ram regions.

>2. Uncompressed payload
>I'm not sure I understand what this means. Right now,
>my payload is filo. In the build, I see:
>
>dd conv=sync bs=196608 if=/bios/filo-0.4.2/filo.elf
>of=payload.block
>cat payload.block > romimage
>
>Oh, I guess you must mean this stuff:
>
>objcopy -O binary linuxbios_c linuxbios_payload.bin
>./nrv2b e linuxbios_payload.bin
>linuxbios_payload.nrv2b
>
>So I guess there is some kind of compression going on
>there.

Not sure if you're using Linuxbios V1 or V2 but in V1 there is an option in 
your build config file to turn off compression - you probably need 
something like:

option CONFIG_COMPRESS=0

If it's V2 then no doubt there is an equivalent there too.

>Which method would be the right thing to do? I'll look
>at the shadow ram thing first then.
>
>Thanks.

Nope this helps

Ian

>--- "Ronald G. Minnich" <rminnich at lanl.gov> wrote:
> >
> >
> > On Tue, 1 Mar 2005, ramesh bios wrote:
> >
> > > Strike that. The issue is somewhere with
> > > copy_pirq_routing_table. IE: why does the copy to
> > > f0000 fail. I had assumed that the 500 address was
> > an
> > > alternate location that the table was copied to.
> > So
> > > now, I'm looking at that f000 failure.
> >
> >
> > the copy to f0000 fails because shadow ram is not
> > set up.
> >
> > You can fix this one of two ways. One is to figure
> > out how to enable
> > shadow ram. The second is to make the payload
> > uncompressed. The copy will
> > still fail but linux will find the PIRQ table
> > anyway.
> >
> > ron
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>
>
>
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