linux-kernel - linux-3.6.11-rt30 smoke test on ARM

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Date:	Thu, 7 Mar 2013 19:55:47 -0800
From:	Frank Rowand <frank.rowand@...sony.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>, <linux-rt-users@...r.kernel.org>
Subject: linux-3.6.11-rt30 smoke test on ARM

linux-3.6.11-rt30 builds and boots on some ARM boards (PandaBoard, Realview) for:

  - SMP, PREEMPT_RT_FULL
  - SMP, PREEMPT_NONE
  - UP, PREEMPT_RT_FULL
  - UP, PREEMPT_NONE


The PandaBoard frequently fails to boot with an eth0 error.  I have
only seen this for SMP, PREEMPT_NONE.  This same error also occurs
in 3.6.7 without the RT_PREEMPT patches applied, so this does not
appear to be an RT_PREEMPT issue.

This error also occurred in the previous smoke test of linux-3.6.7-rt18

   http://permalink.gmane.org/gmane.linux.rt.user/9202

The boot error starts with the USB time out on ep0out:

[    3.264373] smsc95xx 1-1.1:1.0: usb_probe_interface
[    3.269500] smsc95xx 1-1.1:1.0: usb_probe_interface - got id
[    3.275543] smsc95xx v1.0.4
[    8.078674] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, 82:b9:1d:fa:67:0d
[    8.091003] hub 1-1:1.0: state 7 ports 5 chg 0000 evt 0002
[   13.509918] usb 1-1.1: swapper/0 timed out on ep0out len=0/4
[   13.515869] smsc95xx 1-1.1:1.0: eth0: Failed to write register index 0x00000108
[   13.523559] smsc95xx 1-1.1:1.0: eth0: Failed to write ADDRL: -110
[   13.529998] IP-Config: Failed to open eth0


The boot error can be avoided with a workaround that simply retries
the failed USB command.  I will reply to this email with the patch.

-Frank

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