Fwd: Re: Linux Kernel for ARM and SATA problems

Zygmunt Krynicki zygmunt.krynicki at canonical.com
Wed Mar 21 00:08:04 UTC 2012

Forwarding a post from debian-arm. I think I may be affected by this 
bug. Could anyone help me check if this still applies to 

Best regards

------ Wiadomość oryginalna ------
Temat: 	Re: Linux Kernel for ARM and SATA problems
Odesłano-Data: 	Tue, 20 Mar 2012 01:25:53 +0000 (UTC)
Odesłano-Od: 	debian-arm at lists.debian.org
Data: 	Mon, 19 Mar 2012 18:25:03 -0700
Nadawca: 	Mike Thompson <mpthompson at gmail.com>
Adresat: 	Phil Endecott <spam_from_debian_arm at chezphil.org>
Kopia: 	debian-arm at lists.debian.org

On Sun, Mar 18, 2012 at 1:38 PM, Phil Endecott
<spam_from_debian_arm at chezphil.org
<mailto:spam_from_debian_arm at chezphil.org>> wrote:

     It works for me.  I seem to recall a small amount of agro getting
     the kernel
     config right, but u-boot was always able to recognise the device.  I
     that you find (borrow) another SATA device to test with.
     Good luck!

I was able to borrow another SATA drive and that works, thank heaven.  I
thought I was going crazy for a while -- don't ask how many times I
re-compiled the kernel.

I did trace the problems I having to the ahci code in the kernel not
properly handling an ahci CONINIT event generated by my WD5000BEVT
drive.  Seems this drive has extra SATA features implemented so that it
can be used in hot-plug arrays and these features aren't recognized by
the kernel driver so it just seems to shut down the drive and ignore
it.  The other SATA drive that I do have working with the kernel doesn't
implement the extra features so the kernel is happy.  Presumably these
problems were fixed in later kernels and the patches didn't make it into
Freescales branch.  On the other hand, the kernel might be fine
and the firmware in the drive isn't conforming to the ahci specs, but I
think that wold cause problems with the drive on other systems.  I'm
going to keep looking into this as I do want to get my 500GB SATA drive
working with the iMX53 Quick Start.


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