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[Bryan Wu <bryan.wu@xxxxxxxxxxxxx>]

This config file is based on Ubuntu Natty TI OMAP4 config file

** Attachment added: "mainline_config"
   https://bugs.launchpad.net/ubuntu/+source/linux-ti-omap4/+bug/633227/+attachment/1791242/+files/mainline_config

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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.