Re: [Xen-devel] intel agp card support 2

["Ronald G. Minnich" <rminnich@xxxxxxxx>]

On Wed, 5 Jan 2005, Stijn De Weirdt wrote:

> More About the Kernel From Power-On to Shell prompt When the power is
> turned on, the CPU can recognizes only first 8K of ROM and RAM and the
> on-chip RAM are not defined. The address of the 8K of ROM starts from
> 0x0. First, the reset vector is taken at address 0x04 and the CPU starts
> executing instructions from that address specified by reset vector. The
> bootup routine(arch/m68knommu/kernel/head.S) initializes the on-chip RAM
> and copies the instructions that initialize RAM and ROM to the onchip
> RAM and branches to the onchip RAM. After finishing setting up RAM and
> ROM, it jumps back to the ROM(now, ROM's starting address is changed to
> 0xc00000). Memory blocks are configured as in the table.

this is just 68k, i386 is utterly different. 

> > I also vaguely remember you can try to invoke X and tell it to NOT try to
> > run the vga bios, have you tried that? there is no real need to run it.
> from man i810 on my system:
> The  driver  makes use of the video BIOS to program video modes for the

>        830M and later.  This limits the video modes that can be used to  those
>        provided  by the video BIOS, and to those that will fit into the amount
>        of video memory that the video BIOS is aware of.
> (mine is the 865G)

yes, but bios has done that. I have started X on several cards and told it 
not to run the vga bios and it works on some, not on others. 

ron


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