Date: Sat, 6 Feb 1999 18:30:01 -0800 (PST) From: Adrian Filipi-Martin <adrian@ubergeeks.com> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/9927: miltichannel scsi 3940 channel swapping problem Message-ID: <199902070230.SAA08667@freefall.freebsd.org>
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The following reply was made to PR kern/9927; it has been noted by GNATS.
From: Adrian Filipi-Martin <adrian@ubergeeks.com>
To: "Daniel C. Sobral" <dcs@newsguy.com>
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/9927: miltichannel scsi 3940 channel swapping problem
Date: Sat, 6 Feb 1999 21:28:12 -0500 (EST)
On Sun, 7 Feb 1999, Daniel C. Sobral wrote:
> > As a result the boot disk shows up as da1. This is sort of ok
> > except that the BIOS reports this device as drive 0, and not drive 1.
> > This confuses the hell out of the new bootblocks. To boot I
> > must have "0:da(1,a)kernel" in /boot.config. The new loader doesn't
> > like the fact that da1 == BIOS 0 either.
>
> set root_disk_unit=1 does not help?
Well, no it didn't the last time I tried. But this was actually
before the new bootblocks became the default, so I decided to try the
loader again. I suppose I really am using the new boot blocks, and that
the loader is the first boot stage that doesn't grok my hardware
configuration. I discussed the loader problem with Robert Nordier a few
weeks ago, but I now see real that the problem is with ahc and not the
loader.
For the sake of completeness, here's what I see on my box,
including trying your suggestion.
scenario 1:
With no /boot.config:
pressed space to get "boot: " prompt.
defaults to 0:da(0,a)/boot/loader
pressed enter to load loader
announces that btx loader is using the following bios mapping:
a: -> disk0
c: -> disk1
d: -> disk2
pressed enter to load kernel
loads kernel, but panics when mounting root from wrong disk.
secenario 2:
With no /boot.config:
pressed space to get "boot: " prompt.
defaults to 0:da(0,a)/boot/loader
pressed enter to load loader
announces that btx loader is using the following bios mapping:
a: -> disk0
c: -> disk1
d: -> disk2
pressed space to get loader prompt.
show currdev == loaddev == disk1s2a
set root_disk_unit=1
boot -s
loads kernel, but panics when mounting root from wrong disk.
secenario 3:
With no /boot.config:
pressed space to get "boot: " prompt.
entered 0:da(1,a)/boot/loader
pressed enter to load loader
announces that btx loader is using the following bios mapping:
a: -> disk0
c: -> disk1
d: -> disk2
pressed space to get loader prompt.
show currdev == loaddev == disk2s2a
cannot do 'ls' or load kernel.
set root_disk_unit=1
cannot do 'ls' or load kernel.
unset root_disk_unit
set currdev=disk1s2a
ls works now, but still cannot load kernel
set root_disk_unit=1
ls still works, and cannot load kernel
As I mentioned above, I believe the problem is that the ahc driver
isn't correctly handling the switched SCSI channels. The code in
/sys/dev/aic7xxx/aic7xxx.c is not doing the right thing. It does try. See
aic7xxx.c near line 987:
/*
* Attach secondary channel first if the user has
* declared it the primary channel.
*/
if ((ahc->flags & AHC_CHANNEL_B_PRIMARY) != 0) {
bus_id = 1;
bus_id2 = 0;
} else {
bus_id = 0;
bus_id2 = 1;
}
The "ahc->flags & AHC_CHANNEL_B_PRIMARY" test is never true. I
tried examining some of the other flags for the correct bit, but when I did
fine one that changed when I switch the primnary channel, it caused other
problems, so I don't think I had it correct.
thanks,
Adrian
--
[ adrian@ubergeeks.com -- Ubergeeks Consulting -- http://www.ubergeeks.com/ ]
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