On Wed, 2003-06-11 at 19:15, fpga dsp wrote: > Hi, > > I am using kernel 2.4.20-pre6 version on db1500 and > having problem with PCI card as bus master. Basicly, > the kernel can recognize the card and assign into > 0x40000000 address region, irq is 1. Now that is > really strange, stty1 using irq 1 as well. Are they > the same or different. There's no UART1 on the Au1500 so you don't have to worry about that interrupt, even though it's defined in the .h file for the Au1000. > However ,the problem is that > after setup the device and trigger it, it should go > and fetch the descriptor and will fetch the content > pointed by that descriptor afterward but it only fetch > the descriptor and quiet. I am even try to trigger it > again by write into it register mapped on PCI memory > region but after the first trigger, the second trigger > doesn't appear on pci bus analyzer at all. > Another issues, it when I look at au1000_eth.c device > driver , dma_alloc() function allocate a DMAable > buffer in KSEG0 region but pci_alloc_consistent return > in KSEG1 region. So which one is right? Right for what? KSEG0 works because the cache is coherent. But due to a pci coherency bug, I think for a new device driver that's a pci bus master you need to use kseg1 for now. Pete
