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SubjectRe: Problem with i820 AGP patch
Daniele Venzano wrote:

> Your patch to add AGP support for i820 chipset doesn't work for me, if I
> load agpgart module with agp_try_unsupported=1 I get:
>
> -
> Linux agpgart interface v0.99 (c) Jeff Hartmann
> agpgart: Maximum main memory to use for agp memory: 262M
> agpgart: Trying generic Intel routines for device id: 2501
> ^^^^^^^^^^^^^
> agpgart: AGP aperture is 256M @ 0xd0000000
> -


Here is what I have in 'drivers/pci/pci.ids' :

2500 82820 820 (Camino) Chipset Host Bridge (MCH)
1043 801c P3C-2000 system chipset
2501 82820 820 (Camino) Chipset Host Bridge (MCH)
1043 801c P3C-2000 system chipset
250b 82820 820 (Camino) Chipset Host Bridge
250f 82820 820 (Camino) Chipset PCI to AGP Bridge

So I guess that 0x2500 and 0x2501 should be initialized in the same way,
through the same routines. Unfortunately, I dont have such a machine to
test... Can you send what 'lspci -ev' shows ?


> That device id is different from the corresponding line in apg.h:174
> #define PCI_DEVICE_ID_INTEL_820_0 0x2500
>
> I tried to change that line in:
> #define PCI_DEVICE_ID_INTEL_820_0 0x2501
>
> And it worked! But I don't know why the id for your chip is different
> from mine...
>


It worked, but in which way ? Did you test X+OpenGL apps to see whether
it did the trick ? The fact that the module loads itself is not always
sufficient to say that it works (believe me :-)


> My motherboard is an Asus P3C2000 with a P3 500 running kernel 2.4.14
>
>
> I've also another problem (I think AGP related) with DRI/DRM ang XFree
> 4.1.0, but I'm still working on it.
> If I try running some OpenGL app with more than 256Mb of RAM, the system hangs
> (need hard reset, no SysReq works). This happens with 2.4.13 and 2.4.14,
> before I hadn't tried since I had only 128Mb...)
> Someone can please tell me if this problem has something to do with
> having a "Maximum main memory to use for agp memory" value grater than
> AGP aperture value ?
>

With your custom patch, or with the 'generic' stuff ?

Regards.
--
Nicolas Aspert Signal Processing Laboratory (LTS)
Swiss Federal Institute of Technology (EPFL)


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