Re: Direct PCI Access

[Stas Sergeev <stsp@aknet.ru>]

Hello.

Mark Mitchell wrote:
> Do all PCI devices use DMA or is that devices specific?
This is device specific of course, but
I think most of them do. For example
recently added PCI/VESA driver for dosemu
can drive the PCI/AGP video boards quite
well - they use DMA for 3D acceleration in
most cases, but who cares about 3D accel
under DOS.
Doing
grep DMA /usr/src/linux/drivers/net/eepro100.c
gives you an idea that your NIC really use it.

> Your right about the packet driver, that should work but if my PCI
> Channel card uses DMA I'm pretty much screwed right?
No, the packet driver will work in any case.
Direct access will not, but who cares if the
packet driver does the trick.