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Re: s3 product


On Nov 26, 2008, at 10:14 AM, rjs%fdy2.demon.co.uk@localhost wrote:

What does PCI_MAGIC_IO_RANGE do ?

Tell display drivers and X at which offset to mmap the PCI IO range that belongs to the resp. framebuffer.

Are accesses to it byte swapped for powerpc ?

Usually doesn't matter since few IO ports would be bigger than 1 byte but since the PCI bus is LE bigger accesses need to be swapped.

When I last checked, the S3 driver in Xorg just does inw/outw calls to the
device registers.

Look at ppc_video.c and compiler.h, then you'll see that IO macros on powerpc translate to memory accesses relative to ioBase which is set by mmap()ing PCI_MAGIC_IO_RANGE.

have fun

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