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SubjectRe: Additional info. for PCI VIA IDE crazyness. Please read.
WOW...a mail from the guy himself, Linus Torvalds!

Beforehand, I'd like to point out that I forgot to add one little
point. All the kernels I've used >2.2 put ide1 on IRQ 15 when I make
it do that (even the ones >-test11) because it gives me:

ide1 at 0x170-0x177,0x376 on irq 15

but it seems as though >-test11 kernels want to give me a whole bunch
of hdb: lost interrupt errors, not allowing me to boot into Linux
(unless I use some kind of floppy root...hey...there's an idea)

On Mon, Jan 01, 2001 at 08:33:53PM -0800, Linus Torvalds wrote:
> Please try a few things:
> - enabled DEBUG in arch/i386/kernel/pci-i386.h to see what the PCI irq
> routing tables say.
> - don't pass the command line with the bogus irq
> - alternatively, pass the command line, but use "ide1=0x170,0x376,14"
> instead (which will force it to use irq14 - the only difference from
> no command line at all should be that it doesn't even try to probe it)

Okay. With -test11, both of these alternatives give me the same
result. The system boots, but I cannot access my two CD-ROM drives
(hdc and hdd) because of 'lost interrupts', with -test12, my system
refuses to bring up init because hdb (my Linux drive) keeps giving me
'lost interrupt', execpt now, -test12 gives me some more strange errors
(before I enable DEBUG):

hdc: cdrom_pc_intr: The drive appears confused (ireason = 0x 1)

This repeats for at least 20 lines, then says the same thing for hdd.

When I enable DEBUG, I get a whole bunch of new stuff, most of which
makes any sense to me, but I'll try to give the relavent info:

PCI: BIOS32 Service Directory structure at 0xc00fdb40
PCI: BIOS32 Service Directory entry at 0xfdb50
PCI: BIOS probe returned s=00 hw=01 ver=02.10 l=01
PCI: PCI BIOS revision 2.10 entry at 0xfdb71, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: IDE base address fixup for 00:07.1
PCI: Scanning for ghost devices on bus 0
PCI: Scanning for ghost devices on bus 1
PCI: IRQ init
PCI: Interrupt Routing Table found at 0xc00f85f0
00:07 slot=00 0:fe/4000 1:ff/8000 2:00/0000 3:04/deb8
00:08 slot=01 0:01/deb8 1:02/deb8 2:03/deb8 3:04/deb8
00:09 slot=02 0:02/deb8 1:03/deb8 2:04/deb8 3:01/deb8
00:09 slot=03 0:03/deb8 1:04/deb8 2:01/deb8 3:02/deb8
c3:00 slot=72 0:60/0e1e 1:1f/e852 2:93/8b00 3:fa/1f5a
0a:18 slot=05 0:74/3c27 1:f0/0c73 2:e8/feb9 e:0a/74c0
PCI: Scanning for ghost devices on bus 10
PCI: Discovered primary peer bus 0a [IRQ]
PCI: Scanning for ghost devices on bus 195
PCI: Discovered primary peer bus c3 [IRQ]
PCI: Using IRQ router VIA [1106/0586] at 00:07.0
PCI: IRQ fixup
PCI: Allocating resources

(then it allocates resouces...a bunch of I/O ports from what I
understand...doesn't seem too important)

(then it goes on...)

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with
VP_IDE: IDE controller on PCI bus 00 dev 39
IRQ for 00:07.1:0 -> PIRQ fe, mask 4000, excl 0000 -> newirq=14 ->
assigning IRQ
PCI: Assigned IRQ 14 for device 00:07.1

(then it goes on with the confused device errors and stops)

If I've left out something important, ask. I've got the printout right
here, so I can type it in.
> - see what happens if VIA low-level driver support is disabled, so that
> you end up using the non-chipset-specific code. It may be that the
> chipset-specific code has some magic "change the irq setup" code that
> clashes with the fact that the PCI layer has enabled the irq routing.

I didn't enable low-level driver support in the first place. Just
"Generic PCI IDE chipset support" (CONFIG_BLK_DEV_IDEPCI)

> (In particular, some of the low-level drivers have tried to do some
> things by hand, to work around the fact that the PCI layer hasn't done
> the kind of complete setup that it _does_ try to do these days.
> Sometimes that code is broken.).

Well, with the quailty of this low quailty POS m/b, I'm not surprised
if that is the case (if I had more money, I would throw this thing out
of the window, go outside in this minus 40 weather and jump on it until
it turns into a nice fine powder, then go and buy a new computer from
VA or something. Then I'd have someone to complain to if it didn't
work. (I built my last one)).

| Evan Thompson | ICQ: 2233067 |
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