PCI/SCSI help

[acurtis at directvinternet.com]

> > PCI Autoconfig: Device 15, Vendor 0x1000, Class 0x1000001
> > PCI Autoconfig: Found Bus 0, Device 15, Function 0
> > PCI Autoconfig: BAR 0x10, I/O, size=0x100, address=0x7ffff00
> > PCI Autoconfig: BAR 0x14, Mem size=0x400, address=0x7fffc00
>                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> These two overlap. Firmware in Intel mode with separate IO and mem
> spaces?

It would appear that these overlap but since we are talking about base
addresses on the PCI bus and different types of bus cycles, it is ok.

> > sym53c8xx: at PCI bus 0, device 15, function 0
> > sym53c8xx: 0x07fffc00 = pci_get_base_address(base)
> > sym53c8xx: 0x07ffc000 = pci_get_base_address(base_2)
>
> What's it doing with these values? Where does it get them from? Those
> are the original, un-moved addresses. Both BAR and pci_dev should have
> been changed by pcibios_fixup_resources(). Have a look at that code and
> see why the corrected base addresses are not written back.

On the PCI bus itself the Memory and I/O addresses are 0 based so these BAR
values are ok. From the host bus the addresses are 0x4ffffc00 and
0x4fffc000.

> > sym53c8xx: 53c895a detected
> > sym53c895a-0: rev 0x1 on pci bus 0 device 15 function 0 irq 19
> > sym53c8xx: device->slot.base = 0x07fffc00
> > sym53c8xx: device->slot.base_2 = 0x07ffc000
>                                  ^^^^^^^^^^^^
> Nope, wrong again.

Yup, these are the BAR's. The host addresses to the PCI bus are translated
into 0 based addresses on the bus.

> > sym53c8xx: ncr_script_copy_and_bind(src 0xc04f7ce0, dst 0xc04be054)
> > sym53c8xx: ncr_script_copy_and_bind(src 0xc04f7ce0, dst 0xc04be054)
> > sym53c8xx: 0xf0ccff07 = cpu_to_scr(0x07ffccf0) /* just byte swapping */
>              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I hope it's not byteswapping an address here?

That is a good question. PCI is little-endian, PowerPC is big-endian. When
should the addresses be swapped. When aren't they swapped by the lower
levels?


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/