> > I tried to populate my Sun Ultra 10 with PCI cards. All but the last > > slot work but the last slot is assigned a non-working BAR. It sees that > > this area is reserved for Video ROM. Why is there Video ROM placeholder > > at that address - I see no resource in ATI VGA for it? > > It's not a "placeholder", it's absolutely necessary because this range > is implicitly decoded by any VGA capable device in the system. > > Therefore no device should ever be allocated that part of the address > space. > > If OBP is allocating this range to non-VGA devices, it's buggy, and is > risking multiple devices responding at the same time to an I/O space > access. There are 2 different onboard grpahics "cards" on U5/U10 mainboard, PGX that is ATI Mach 64 with 2M SGRAM and PGX24 that has 4M SGRAM. I have the latter. And these do not seem to need this reservation. Maybe Sun does not support legacy VGA cards in PCI slots (only PCI-assigned areas)? The onboard PCI VGA is on PCIB, slots are on PCIA bus. So this code protects against PCI VGA cards that have ROM and decode in on c0000 even after being set up on PCI, OK. PCI address assignment section from Sun Ultra 10 service manual tells 0x4000.0000 - 0x7FFF.FFFF, 1 Gbyte, PCI bus A memory space (PCI slots APB ASIC register(equals 0xc)) 0x40.0000 - 0x7f.ffff, 4 Mbytes, PCI bus A I/O space (PCI slots) I can not correlate these to any number I saw in OBP and Linux assignments... there is only assigned-addresses: 83022010.00000000.000c0000.00000000.00010000 and that has c0000. And a magic section C.3.3.1 telling PCI bus A has all the PCI slots and the address is programmable by the OpenBoot Prom (OBP). Any idea how I can change the slots address assignment from OBP? The setting are result of "set-defaults" plus changing boot device to Adaptec scsi and maybe changing console. http://developers.sun.com/solaris/developer/support/driver/wps/pci/html/Device_Prop.doc.html talks about what assigned-addresses and regs mean but that's not that. Neither does "OpenBoot 4.x Command Reference Manual" help here. As a test, I removed the Video ROM reservation and tg3 of course started working since there was no VGA on that bus. What should I do to cause some problem without Video ROM area - try different old PCI graphics cards in slots 2 and 3? On what other PCI Sun that could be a problem? I could probably test it :) -- Meelis Roos (mroos@xxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
