To answer my own question:

> Do you know if there're any 256 MiB Radeon 9250 cards with
> linear 256 MiB aperture mapping?

It seems there are:

http://www.a1k.org/forum/showpost.php?p=384261 (Google translation)

OS4.1 has the same issue with Radeon 9250 cards only using half of the 256 memory, I remember one of their developers (Rogue, probably) saying he had one card that gave the full memory, all the others only giving 126. Possible that it maybe fixed with an updated, but that it was low priority.

My Peg2 has this issue in MorphOS/amiga OS 4.1 and Debian Linux for that matter. unlike 32mb I've never actually had any problems with 128MB of Chip graphics ram, but it's slightly irritating it's not all been used.

Quote:

Interesting reference. From the look of these cards, a card that isn't based on the reference design might have a continuous 256MB aperture.

BTW - Has anyone had a problem using a specific version of a 9200 or 9250 based card? The only reason I bought a card based on the reference design was to make locating the one resistor that has to be moved (or removed) easier.
I wasn't aware that anyone had experienced problems. The only card I wouldn't recommend for re-flashing is the 9600 as Apple's version uses a specific kind of memory found on only some 9600s (and Apple 9600s are common and fairly inexpensive).

[ Edited by Jim on 2011/1/11 20:47 ]

[ Edited by Jim on 2011/1/11 20:49 ]

> those map their memory space into physically seperated 128MB apertures
> and it's a mess to unify those apertures again. [...] I did not put any efforts into
> mapping the full range. It still might happen in a future release, though.

Others tried and failed:

http://forum.hyperion-entertainment.biz/viewtopic.php?p=3040#p3040

;-)