Re: PCI enlightenment follow-up

sym should _not_ play with these bus-view addresses. Have a look at the
driver where it gets these from.

I think it has to. From what I remember the author of the driver told
me, the card need to be programmed to point to it's own memory
or something like that.

quoted

sym53c8xx: setting PCI_COMMAND_PARITY...(fix-up)
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

Should contain the offset from host to PCI bus. With these addresses,
there's no way to access the SCSI card from the driver.

quoted

sym53c895a-0: ID 7, Fast-40, Parity Checking
/* vtobus() mapping looks ok */
sym53c8xx: 0x404ba000 = vtobus(0xc04ba000)
sym53c8xx: 0x404bd800 = vtobus(0xc04bd800)

Where do these come from? Is that DMA memory?

Looks like. It's correct provided the infos Allen gave us regarding
his bridge setup are correct.

quoted

sym53c8xx: np->base2_ba = 0x07ffc000
/* 1-to-1 BAT mapping */
sym53c8xx: 0x4fffc000 = remap_pci_mem(0x4fffc000, 0x00002000)

This looks good indeed.

quoted

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)

            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nope, reversed address. That will not work. Don't touch the address,
touch the data if necessary. What needs to be swapped is data going
_over_ the little-endian PCI bus. Addreses don't go _over_ the bus, they
address resources _on_ the bus.

Sure of that ? First let's look at what the driver actually does in that
routine. I know that the NCR chips are have bus-masterers ;)

Ben.

Cheers

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