I have a UltraSparc5 with an onboard Rage3D, workes with the mach64 driver. There are some problems with the kernel and PCI domains, but I got thoes cleared out. There is still a problem that the chip is stuck in whaterver mode is set by openboot(the bios), but I can change the bit depth. Other than that and endianess and byte size issues is there any thing else that might not work? I oftan have to build programs with the sparc32 command, I hope that X will be no diffrent. Are any of the fallbacks 64bit accelerated?
SPARC support has fallen a bit out of date. I don't think there are any rasterization optimizations (i.e., assembly code) for SPARC, and some of the TNL assembly code was disabled. You will need to build both the kernel and user parts for either 32-bit or 64-bit. Don't mix-and-match. There are known DRI issues if you do that. Other than that, I think you've already enumerated all of the "obvious" types of problems you may run into. :) Please report back any successes or failures you have.
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