Hi Marcin,

Suppose you use ubuntu rootfs, usb(ehci-omap) does not work on my pandaboard 
with
the kernel and modules(even with ubuntu 10 and 11 release for omap4), but is OK 
if I run
the same kernel and modules on Angstrom.

I guess some Ubuntu applications does some special things which may casue usb 
exception
on my pandaboard.

Maybe your issue is related with it.

If you'd like to, you may test the kernel and modules on Angstrom rootfs, which 
can be
built with the link below.

http://narcissus.angstrom-distribution.org/

-- 
You received this bug notification because you are a member of TI OMAP
Developers, which is a direct subscriber.
https://bugs.launchpad.net/bugs/633227

Title:
  instabilities with highmem activated

Status in “linux-ti-omap4” package in Ubuntu:
  Confirmed
Status in “linux-ti-omap4” source package in Maverick:
  Fix Released
Status in “linux-ti-omap4” source package in Natty:
  Confirmed

Bug description:
  Seen on Maverick: 2.6.35-903.9
  HW: pandaboard ES2.0

  Using following kernel memory allocation (in bootargs):
  mem=460M@0x80000000 mem=512M@0xA0000000

  Instabilities have been observed in 2 different ways:

  1) The following memtester test:
  sudo memtester -p 0xb0000000 120
  Fails in few seconds with a "illegal instruction” error.
  Then various behaviors can be seen:  the UI can freeze, shell commands be 
unavailable. The systems works well again after a reboot.

  2) By doing a native build of a kernel package (with file-system on SD card, 
and kernel sources on an NFS mount):
  After 15mins to 1h30, a "compiler error: bus error" triggers and the build 
stops (and the platform hangs).

  
  This issue cannot be reproduced if using mem=460M@0x80000000 
mem=256M@0xA000000.
  This issue cannot be reproduced with highmen deactivated from the kernel 
config.
  This issue can be reproduced with 'nosmp' in kernel command line.



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