On Wed, 9 Jun 2004, Thomas Winischhofer wrote: > >>I have looked into this more closely now and it seems there are two > >>problems:
> >>1) "port" i/o on MIPS (as on ARM32) is done with memory mapped i/o. The > >>inb/outb macros in compiler.h look smart as they correctly add > >>IOPortBase to the port number, but IOPortBase is not initialized > >>throughout the entire XFree86 code as of 4.4. > >>2) IOPortBase is declared in compiler.h itself and hence isn't global. > >>Therefore, any module including compiler.h will have to initialize it > >>before using inX/outX. Since the vgahw module doesn't do this, it can't > >>be used. > > The ioBase stuff (for PowerPC) is but a stopgap that can only handle > > single-domain systems. It should be replaced. Domain support associates a > > base address for the three address spaces (I/O memory & PCI config) each domain > > is comprised of. > >>Well. I think I give up for the time being. > > I'm sorry to hear that. > Well, I have no choice. I have no hardware myself for testing and that > crappy SiS stuff doesn't support MMIO based i/o for VGA register access... It doesn't need to. > Furthermore I was educated in a mail from Jun Sun who wrote some > porting-HOWTO for MIPS: > ---- > >My question: How do I find out about mips_io_port_base from userland > >(ie XFree86)? > You can't. > However, you can do IO from userland through /dev/port. I don't know > if /dev/port is mmap'able at this point. This points to an insufficient understanding of what PCI is. Marc. +----------------------------------+-----------------------------------+ | Marc Aurele La France | work: 1-780-492-9310 | | Computing and Network Services | fax: 1-780-492-1729 | | 352 General Services Building | email: [EMAIL PROTECTED] | | University of Alberta +-----------------------------------+ | Edmonton, Alberta | | | T6G 2H1 | Standard disclaimers apply | | CANADA | | +----------------------------------+-----------------------------------+ XFree86 developer and VP. ATI driver and X server internals. _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
