Dan and Steve, The way we got the qspan up and running was to check a GPIO pin to see whether or not the Qspan was present, inside pci_init or pcibios_init (I did this a while ago), and if it was present we intialized the qspan and scanned the bus then, this prevented the majority of the problems of running the pci_scanner code from the bootrom since the linux exception vectors are there. I am glad to hear that people are using the Qspan II, since we intend to shift to that chip soon, so any issues that you all run into I would love to hear about or assist you.
Jason -----Original Message----- From: [EMAIL PROTECTED] [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of Dan Malek Sent: Monday, March 20, 2000 3:04 PM To: Steve Rossi Cc: Dan Malek; Embedded Linux PPC List Subject: Re: Question on QSPAN Driver Steve Rossi wrote: > Ok, now this is making a whole lot more sense to me, so where would > be an appropriate place to call qspan_init and pci_scanner from? I do it after the serial initialization so you can print the messages. I am changing some of this code right now so it will either call an initialization function prior to decompress_kernel or as part of decompress_kernel. I don't know why I put so much stuff in the assember code.....It is changing now. > ......I can't find where (or if) it happens for > the mbx board. You don't have to do the qspan_init for the MBX board. PPC-Bug already does this. It also attempts some mapping, but it doesn't get it right. I just realized there is a big piece of code missing that will prevent this from working properly. Configuration register access to devices that don't exist will result in a machine check exception. There isn't anything in this boot code at the moment that will trap this exception and properly return to the qspan_pci functions........I guess I dropped the PCI functions here so I wouldn't lose them, and didn't finish the development. Another thing for the list..... -- Dan ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
