AGP/DRI: Question about aper_size_info structs in agp.h

2006-08-23 Thread Gerhard Pircher
Hi,

I was wondering about the differences between the aperture size types 
defined in agp.h. As far as I understand the size_value field in the 
aper_size_info_8/16/32 structs just defines the value to be set in the AGP 
bridge registers to configure a specific AGP aperture size (e.g. 8 MB, 
16MB, etc..).

Wouldn't it be sufficient to define size_value as 32 bit only, or does the 
type of size_value/aper_size_info_x have an influence on the generation of 
the graphics address remapping table (e.g. address alignment) ?

For example the uninorth driver uses the aper_size_info_32 struct to define 
the AGP aperture size, but only defines values between 1 and 64 for the 
size_value field (so aper_size_info_8 would be sufficient).

BTW: Can anybody explain the format of the graphics address remapping table 
or point me to some docs where it is described?

regards,

Gerhard

BTW: Please CC messages to me, as I'm not subscribed to this mailing list.
Thanks!

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Re: AGP/DRI: Question about aper_size_info structs in agp.h

2006-08-23 Thread Alan Cox
Ar Mer, 2006-08-23 am 15:24 +0200, ysgrifennodd Gerhard Pircher:
 BTW: Can anybody explain the format of the graphics address remapping table 
 or point me to some docs where it is described?

Its usually described and defined in the chip documentation. Generally
speaking it is a simple linear array of translations identifying which
page address is mapped to which gart address.



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