Hi Oliver, > The PCI card I'm using works without problems on a X86 PC, so I think > the PLX hardware is O.K. I checked every local PLX9054 register on the > MPC5200 against the X86 PC. On both computers they have the same values.
Ok, that eliminates a hardware error in reading registers on the board, i.e., the PCI connection is fine. There could still be errors in the PCI-9054 local bus connections ... > Even a simple block DMA does not work, although I checked all registers > and addresses. So I think the plx driver software is O.K. I'm sure you have checked this, but I'll mention it just in case ... you are using readl/writel type functions to access the little-endian PCI registers from the big-endian PowerPC right? > on the MPC5200 > and there has to be a hardware reason. Maybe the pci bus is not granted > to the bus master controller of the PLX9054 when it requests the bus. > We'll check this when our hardware guy has time for this ;-) A PCI bus logic analyzer is pretty nice for this type of issue. I use an Agilent 1680A, and a FuturePlus PCI or CPCI adapter board. The analyzer is about $20k, while the adapters are about $2k. However, they pay for themselves pretty quickly. >> Anyway, manually setup a DMA transfer and convince yourself that >> you know which bits to twiddle, then figure out why the driver >> code isn't doing as its asked. > > I've done so without success. Without success on the x86 too? > The driver seems to make everything correct. A block DMA is fairly > simple on the 9054, so I think there must be a hardware reason for this. > Has anybody ever used a PCI card on the MPC5200 which has its own > busmaster controller? I think most people use the BestComm DMA > controller on the MPC5200, right? I tested the PCI debug driver I wrote from an x86 with my PLX boards, and on a Yosemite (440EP) board. I tested DMA using the PCI-9054 DMA controllers, and the 440EP controllers. Read p23 to p35 of my 440EP test document, I have some tests there that you could repeat ... http://www.ovro.caltech.edu/~dwh/powerpc_440ep.pdf However, life will be much easier if you can grab the hardware guy's logic analyzer ... out of his cold dead hands if need be ;) Dave _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
