Date: Wed, 17 May 1995 23:08:59 -0700 From: Christopher Seiwald <seiwald@tea.org> To: freebsd-hardware@FreeBSD.org Subject: EIDE + SCSI = bad combination or just bad luck? Message-ID: <199505180608.XAA01457@spice.tea.org>
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Setup: ASUS PVI 4SP3 motherboard with on-board (E)IDE NCR 53C810 PCI SCSI adaptor card One IDE disk One SCSI disk FreeBSD 2.0 The problem: If the IDE and SCSI disks are active at the same time, the NCR SCSI driver goes into conniptions. Sometimes asserts() in the NCR code fail, sometimes the system hangs with one or both disk's activity light on, sometimes I get errors reported by the NCR code. It doesn't appear to be interrupts: using the BIOS config, I turned off the interrupt for the PCI slot (as verified by the NCR driver which reported "interruptless mode: reduced performance"). Still things hung. So I changed the PCI memory address map from c0000000 to c0010000 - still no dice. I also tried the 2.0-950412-SNAP, and it failed all just the same. The ugly complications: The motherboard has in its BIOS the NCR BIOS as well, in order to support the optional NCR PCI SCSI board called the "PCI-SC200". The BIOS recognises my NCR card as one of its own and initializes it. Unfortunately, there is no way to find out what that NCR BIOS is doing, since it has no configuration utility of its own (as far as I can tell). I am fairly sure my NCR 53C810 is functionally the same as the PCI-SC200: the board has just the chip and traces, so there isn't really alot of room for variety of implementation. My guess is: Somehow the IDE driver is stomping on the NCR driver's memory, but I don't know how. Anyone with any clues? Anyone have this combination working? Failing that, anybody wanna buy an 850Mb EIDE drive? :-( Christopher
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