From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt To: , Cc: Subject: Re: PCI enlightenment follow-up Date: Tue, 6 Aug 2002 23:09:17 +0200 Message-Id: <20020806210917.13103@192.168.4.1> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: >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. >> 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. > >> 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. >> sym53c8xx: np->base2_ba = 0x07ffc000 >> /* 1-to-1 BAT mapping */ >> sym53c8xx: 0x4fffc000 = remap_pci_mem(0x4fffc000, 0x00002000) > >This looks good indeed. > >> 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 ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/