Richard Parsons wrote:
Hi all,
Hi Richard,
I am trying to get the Freescale MPC832X EMDS with a PCI-Exp board to recognise a PCI device. I have the PCI enabled @66Mhz and all appears to be in working order except there are no sane values are being read from the PCI bus.
On linux 2.6.22 kernel it registers a lots of PCI devices but they all have the vendor ID of 0. (<sarcasm>I really dont believe the board has a nCipher HSM and a SCSI controller on the PCI board.. unless its so small I cant see it </sarcasm>
The Bus powers up, the cards at least get power as far as I can see (blinking light on a 3COM network card :-P
Is there anything I am missing? as I cant seem to get this blessed PCI running properly.
I've run into the same problem. The information I received was to run the PCI bus at 33MHz only. Note that the PCI speed selection in U-Boot doesn't seem to do anything. The code is trying to set the divider bits in the OCCR register, but the 832x chip doesn't have those bits. To change to 33MHz, I had to change SW4-4 (CFG_CLKDVB).
I also experienced problems with the power-on reset. If I used the reset button on the 8323 processor board, I got much better results.
I think the problem may be caused by the removal of some pullup resistors in the processor card. The schematic I have for the Rev 1.1 processor board shows the pullups for nXPCI1_DEVSEL, nXPCI1_FRAME, nXPCI1_IRDY, nXPCI1_TRDY, nXPCI1_PERR, nXPCI1_SERR, and nXPCI1_STOP marked "DNP" which I infer to mean "Do Not Populate." The Rev 1 board did not have the DNP marking for those pullups and worked fine for me. I don't know what Rev processor card you are using, so this may not be related to your problem.
Randy V.