On Thu, Oct 29, 1998 at 11:12:11AM +0100, Ulf Carlsson wrote:
> The problem is that the sgiseeq and the sgiwd93 use HPC DMA as well, but
yes, but they aren't using PBUS DMA channels, because they aren't connected
to the PBUS.
> sharing local interrupt 0 (MIPS IRQ 2), and using some status register to
> differentiate them. If I were writing a sgiwd93 driver or a sgiseeq driver, my
> first guess would have been that they were using the SGINT_HPCDMA interrupts.
SCSI and ethernet are special HPC devices, so they get handled in a different
> Well, looks like I'm out of luck, I'll do some trial & error.
try interrupt 12, which should be the HPC3 interrupt (sgint23.h). After
getting an HPC3 interrupt you have to look in HPC3 register istat0 and
istat1 for the interrupt source. I guess DaveM wanted to map these
interrupt sources to SGINT_HPCDMA, but never got to implement it.
This device has completely bogus header. Compaq scores again :-|
It's a host bridge, but it should be called ghost bridge instead ;^)
[Martin `MJ' Mares on linux-kernel]