22 Mar
2005
22 Mar
'05
10:46 a.m.
I thought the BusMaster interface was pretty uniform, unlike the earlier DMA interfaces which varied from chipset to chipset. Keean. Lennart Augustsson wrote:
But there are plenty of minor variations on how to program and initiate DMA for different devices.
-- Lennart
Keean Schupke wrote:
Actually with PCI chipsets, implementing a generic BusMaster DMA driver is not too hard, assuming you already have interrupts handled (and you don't want 64bit DMA support)... You just load the parameters for the disk read into the PCI registers, and wait for the completed interrupt. I wrote a diver in assembly language for my own OS project a few years ago.
Keean.