On Sat, 2 Jun 2001, Michel [ISO-8859-1] Dänzer wrote:
> I might do that, but then is there any benefit of vgaHW working on a Mac? It > seems to work fine without, so I might as well hack the syscall to fail. Yes, vgaHW is very much indeed needed on Mac (or pretty much any platform). For boards with a VGA core which doesn't have its VGA registers mirrored in (MM)IO space, this is the only way to setup a mode. Since PPC doesn't have "normal" ISA IO space (0x0 - 0xffff), we map the ISAio region (usually first 0xffff off the pciBase, unfortunately some machines have many pciBases, which is the problem ofcourse), this giving the various port IO (inb/outb,etc.) consistent functionality with i386. While few of these boards are used on PPC (voodoo3 was the main reason why I added ISA IO support for ppc in X, but apparently there is new evidence that voodoo3 does indeed have vga regs in MMIO), it is still necessary to have this functionality for other boards (mostly all old boards like the S3 chipsets, ARK, and many others can only set VGA regs by PIO). As Kostas pointed out, an efficent method to deal with the many buses of some Apple machines will have to be worked out in the future. ani
