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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
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.
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