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2.6 kernel on Alpha ?
Re: 2.6 kernel on Alpha ? [ In reply to ]
Hi mathew:

mathewt@lucent.com wrote:
> I am able to compile and boot a UP kernel, but I continuously
> get these messages on screen during boot and later in the
> system logs
>
> [kernel] sd 0:0:0:0: M_REJECT to send for : 1-2-3-1.
>
> seems to come from the SCSI SYM53C8XX_2 driver which handles the
> Symbios 53c810 controller chip. I am using these settings in
> the kernel config
> CONFIG_SCSI_SYM53C8XX_2=y
> CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0
> CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS=16
> CONFIG_SCSI_SYM53C8XX_MAX_TAGS=16
> # CONFIG_SCSI_SYM53C8XX_IOMAPPED is not set
> (I tried using IOMAPPED and different DMA modes and number of TAGs
> also, but the message still shows up)
>
> in 2.4.30, the driver version is sym-2.1.17a and it works fine
> (without any of these REJECT messages), while 2.6.12.5, the
> driver version is 2.2.x I believe.
>
> does anyone on the list know of an issue which could cause this ?
> is the REJECT message a cause for concern ? (system seem to work
> fine as before)

Ferdy and me are also suffering a similar problem using 53c810
controller on AS2100. On our alpha, if you try to boot the installcd
using a 2.6 kernel you will see a lovely kernel dump.

2.6 kernel 53c810 driver seems to be completely broken for us, and
indeed, 2.4 driver works just fine.

After some investigations, i found (on red-hat alpha mailing list) they
patched 2.6 53c810 in some way for the next release of AlphaCore 2.0.
After unpacked the patches from red-hat kernel, I saw a lovely
linux-2.6.12-ncr810-alpha.patch[1] which could be what we are looking
for. If you can give it a try and report the feedback would be c00l.

I'm installing a testing machine to work on this problem but still don't
have time to check if it works.

>
> also, I have udev, though I have not disabled/removed devfs since
> I was not sure if 2.6 is ready for this HW yet

I think the problem comes from the kernel driver, udev/devfs have
nothing to do with this (imho).

>
> BTW, SMP kernel does not boot. the system goes into a kernel panic
> along with machine check and invalid FP emulation instruction etc.
>
> Can 2.6 SMP work on gentoo alpha ? (or only on the newer models ?)

2.6 SMP kernels are still broken on alpha. I think there are some people
mainly from red-hat trying to fix this at the moment. May be kloeri or
agriffis can tell us a bit more about this issue.

>
> I also see that gcc-3.4.4-r1 is marked stable. can that be used for
> kernel, glibc, etc. or its only for specific packages ? (I see that
> its slotted)

A stable gcc should be ready to compile everything!! you can use
3.4.4-r1 to compile all your system.

>
> thanks for any comments, pointers or experiences that you could share
>
> thanks, Mathew
>

Always welcome, np

--------------------------------
[1] http://dev.gentoo.org/~yoswink/tmp/linux-2.6.12-ncr810-alpha.patch

YosWinK @ gentoo.org
Gentoo Alpha Team

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Re: 2.6 kernel on Alpha ? [ In reply to ]
Quoting mathewt@lucent.com:

> Hello All,
>
> I have a couple of questions regarding 2.6 kernels for Alpha
> and also gcc-3.4.4-r1
>
> I have an AS 2000 4/233 running on Gentoo, 2.4.30 SMP-kernel.
> Things work fine except I cannot use all the hardware (DAC960).
> any case, I was trying to move to 2.6 series kernel (vanilla
> sources 2.6.12.5 as picked up by portage)
>

DAC960 issue:

Under the 2.4 kernel there is a simple fix for the DAC960. The OEM version of
the DAC960 (Called a SWXCR) from DEC used a slightly different firmware
release. The standard linux DAC960 driver doesn't recognize these firmware
revisions as valid and hangs.

A simple patch of the DAC960 driver corrects this problem. I've submitted it as
a bug in the 2.4 gentoo kernels in the past and it has been patched for the
liveCD. The 2.6 kernel revision of this driver didn't have this problem.

Brian Parkhurst
Brianp-at-spamcop.net


>
> --
> gentoo-alpha@gentoo.org mailing list
>
>


--
Brian Parkhurst
brianp-at-spamcop-dot-net
Re: 2.6 kernel on Alpha ? [ In reply to ]
Hello Matthew,

>I am able to compile and boot a UP kernel, but I continuously
>get these messages on screen during boot and later in the
>system logs
>
>[kernel] sd 0:0:0:0: M_REJECT to send for : 1-2-3-1.
>
>seems to come from the SCSI SYM53C8XX_2 driver which handles the
>Symbios 53c810 controller chip. I am using these settings in
>the kernel config
>CONFIG_SCSI_SYM53C8XX_2=y
>CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=0
>CONFIG_SCSI_SYM53C8XX_DEFAULT_TAGS=16
>CONFIG_SCSI_SYM53C8XX_MAX_TAGS=16
># CONFIG_SCSI_SYM53C8XX_IOMAPPED is not set
>(I tried using IOMAPPED and different DMA modes and number of TAGs
>also, but the message still shows up)
>
>in 2.4.30, the driver version is sym-2.1.17a and it works fine
>(without any of these REJECT messages), while 2.6.12.5, the
>driver version is 2.2.x I believe.
>
>does anyone on the list know of an issue which could cause this ?
>is the REJECT message a cause for concern ? (system seem to work
>fine as before)
>
>
I have this problem with my SYM53C810 controller too, and the only
solution I've found (that worked) was to manually modify the kernel's
SCSI driver. See this page for the details :
http://lists.debian.org/debian-alpha/2005/05/msg00041.html

From what I understand (which may well be a simplistic understanding of
the real situation), the problem is that the drive connected to the
controller is FAST-WIDE SCSI 2, but the controller can't do WIDE. The
driver tries to set it to WIDE, then send some data to see if it works,
and should fail (the second if in the code in the above page) but
doesn't, so the controller is left in WIDE mode even though it doesn't
support it and that's why it gives those messages. The mystery is why
the WIDE mode transfer doesn't fail as it should.

What I've done is comment out the whole section of code (starting with
the if right after the /* test width */ comment and ending with the
closing curly brace for that if) and then compile the kernel. That way
the driver never sets the controller to WIDE mode at all. Works great.
I'd really like someone to find a more sophisticated solution that
commenting out the whole lot, maybe fixing the test that should fail but
doesn't? Unfortunately my knowledge of Linux kernel drivers is too
limited to do that.

This modification affects the SCSI driver, though, which in my case
isn't a problem since I'm only using this controller, but if your
machine has another controller that should support WIDE mode, then this
change will probably affect it too... Watch out for that.

I wonder also why the patch YosWinK pointed to affects a totally
different source file... I'm not sure it's the same problem, because I'm
on the RedHat-Alpha mailing list too and haven't heard of this specific
problem. Perhaps it addresses another problem in the 53C810 code on Alpha.

Other than that minor problem, I've been running a 2.6 kernel for a
couple months now on my AlphaXL 366 with a 50GB SCSI-2 drive. Runs
great. Of course, it's a single processor machine so I can't help you
with the other problem you're having.

Hope this helps,

J-S

--
___________________________________________
Jean-S├ębastien Guay jean_seb@videotron.ca
http://whitestar02.webhop.org/

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Re: 2.6 kernel on Alpha ? [ In reply to ]