KERNELBASE at 0xa0000000

KERNELBASE at 0xa0000000

[Stefano Coluccini]

Hi,
  anybody knows why in the MCPN765 port KERNELBASE is at 0xa0000000 instead
of 0xc0000000 ?
Thanks.

Stefano.


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Re: KERNELBASE at 0xa0000000

[Dan Malek]

Stefano Coluccini wrote:
>
> Hi,
>   anybody knows why in the MCPN765 port KERNELBASE is at 0xa0000000 instead
> of 0xc0000000 ?

Yep.  It was a quick hack to get a system with 1GByte of memory
working.  It works fine with all other memory configurations as well.

I don't see any reason anymore (once Matt Porter dumps all of the
PReP stuff :-) that we shouldn't be able to move all kernel base
addresses to 0x80000000 or to allow 3 G user spaces.  On PowerPC,
we are simply tossing away 1G of address space that should be
utilized to make our life easier.


	-- Dan

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RE: KERNELBASE at 0xa0000000

[Stefano Coluccini]

> Stefano Coluccini wrote:
> >
> > Hi,
> >   anybody knows why in the MCPN765 port KERNELBASE is at
> 0xa0000000 instead
> > of 0xc0000000 ?
>
> Yep.  It was a quick hack to get a system with 1GByte of memory
> working.  It works fine with all other memory configurations as well.

Thanks a lot for the reply.
I have hoped it was more platform-dependent because I have a MVME5100 (that
is, I think, a MCPN765 with a PCI-VME bridge) and with KERNELBASE at
0xa0000000 doesn't work (in head.S the kernel doesn't recognize that it is
running at 0 and it try to relocate itself).
Do you think that this is a warning of a more complicated problem ?


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RE: KERNELBASE at 0xa0000000

[Sébastien Côté]

On 2001.02.26 10:51:57 -0500 Stefano Coluccini wrote:
> I have hoped it was more platform-dependent because I have a MVME5100
> (that
> is, I think, a MCPN765 with a PCI-VME bridge) and with KERNELBASE at
> 0xa0000000 doesn't work (in head.S the kernel doesn't recognize that it
> is
> running at 0 and it try to relocate itself).
> Do you think that this is a warning of a more complicated problem ?

I think that's what happened when I changed KERNELBASE but not KERNELLOAD.
Try changing both (if it's not already done).

Sébastien Côté


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RE: KERNELBASE at 0xa0000000

[Stefano Coluccini]

> On 2001.02.26 10:51:57 -0500 Stefano Coluccini wrote:
> > I have hoped it was more platform-dependent because I have a MVME5100
> > (that
> > is, I think, a MCPN765 with a PCI-VME bridge) and with KERNELBASE at
> > 0xa0000000 doesn't work (in head.S the kernel doesn't recognize that it
> > is
> > running at 0 and it try to relocate itself).
> > Do you think that this is a warning of a more complicated problem ?
>
> I think that's what happened when I changed KERNELBASE but not
> KERNELLOAD.
> Try changing both (if it's not already done).

I have leaved both untouched the first time, then I have changed both to
0xc0000000 to get working.


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