RE: bus-master DMA error (was: stability of Cobalt Qube 2)

You fixed the issue

Congratulations.



Claudio Leiva S
Las Vegas, Nevada
USA
http://cleiva.no-ip.com
(Powered by NetBSD for Cobalt)

-----Original Message-----
From: [email protected] =
[mailto:[email protected]]=20
Sent: Tuesday, April 24, 2012 9:49 AM
To: Andy Ruhl
Cc: Mike Hebel; Erik Berls; [email protected]; [email protected]
Subject: Re: bus-master DMA error (was: stability of Cobalt Qube 2)

OMG, you guys are so helpful and compiling a netbsd kernel using below =
instructions is even easier than compiling linux :) I think I found the =
culprit. The 320 GB drive is fairly new and is probably not telling the =
kernel which modes / DMA it supports. So I disabled DMA and PIO modes =
alltogether (based on GENERIC config):
wd*             at atabus? drive ? flags 0x0ff0

Now it boots just fine (great!). Thank you very much for your help.

----- Original Message -----
From: "Andy Ruhl" <[email protected]>
To: "kenneth westelinck" <[email protected]>
Cc: "Mike Hebel" <[email protected]>, "Erik Berls" =
<[email protected]>, [email protected], [email protected]
Sent: Tuesday, April 24, 2012 4:58:39 PM
Subject: Re: bus-master DMA error (was: stability of Cobalt Qube 2)

On Tue, Apr 24, 2012 at 5:34 AM,  <[email protected]> wrote:
> Yes, I can imagine you can strip a lot of things from the kernel and =
make it small. When I was young, I used to strip Linux kernels to run on =
a 486, but creating a custom kernel for a netbsd machine seems a little =
more difficult.
> I think I have 2 problems:
> 1) I don't have another BSD machine, so I would need to build the new =
kernel on the Qube. For this to work, I need some more space and I don't =
have a lot of free space left on the CF (the CF is only 1 GB). I also =
think this might take a long time (?).
> 2) Suppose I manage to build a custom kernel, will this solve my =
"bus-master DMA error". As far as I know, the GENERIC kernel is similar =
to a Linux kernel with all of the modules compiled in it (right?). So, =
even if I strip stuff out, I am not sure if this will make my problems =
disappear.
> Since there are some people on this list owning a Qube 2, would it be =
possible to "borrow" a kernel (kernels seem quite small), just to try if =
my problems go away?
> I am now running 5.1.3, also tried 6.0_BETA, still same issue :(

You can build a kernel on Linux. Cross builds are no problem.

Go somewhere on the Linux machine, and do this:

mkdir src tools obj
cvs -d :pserver:[email protected]:/cvsroot checkout -PA =
-rnetbsd-5 src

This will get you the latest 5.x source tree.

From there you need to cross build a kernel. I'm short on time, so =
briefly:

go to src/sys/arch/cobalt/conf/

copy GENERIC to some other name, and edit it and save it.

go back to src

./build.sh -m cobalt -T ../tools -O ../obj kernel=3DGENERIC (but not =
GENERIC, whatever you called it)

After a while it will end up in the obj/sys/..... path called netbsd.

Put it in / on the cobalt, and rename the old kernel netbsd.old

Have your serial cable ready for when it doesn't boot. You can interrupt =
the netbsd bootloader and tell it to boot the old kernel something like:

boot hd0a:netbsd.old

Andy