[LinuxBIOS] Problems with Filo booting - HELP

joe at smittys.pointclark.net joe at smittys.pointclark.net
Thu Oct 4 18:59:49 CEST 2007

Quoting Corey Osgood <corey.osgood at gmail.com>:

> joe at smittys.pointclark.net wrote:
>> Here is my ram_check from 1-128MB. It appears to fill the ram ok. But
>> only returns a value of 0xffffffff. Does this mean the ram is WO
>> (write only) for some reason? Thanks again for your help.
> Okay, this is mostly a shot in the dark, but it's the only thing I can
> find that might cause something like this. I'm looking at the AGP size
> register (APSIZE, 0xb4) in the datasheet, and the default value is 0x00,
> which is 256MB (!!). I also don't see anywhere that AGP has to be
> explicitly enabled, it looks like it's enabled by default (yes, I see
> AGPCMD, but it says cycles will be ignored, not that the device is
> actually disabled and freeing the aperture memory).
> Long story short, try setting the AGP aperture to 32MB and moving the
> aperture base (APBASE, 0x10-13) to somewhere else, preferably wherever
> the stock bios moves it to. Even if it's not the root cause, it'll get
> it out of the way for later.
> -Corey
Those registers also say: "This register is Read Only when either the  
Intel 830M or Intel 830MG internal graphics device is used."

Does that matter? In the original bios these are set to zero.

For IGD the Graphics Memory Aperture Size is set wih bit 0 in GCC1.

Thanks - Joe

Thanks - Joe

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