tiomap-dev team mailing list archive

[Ming Lei <633227@xxxxxxxxxxxxxxxxxx>]

Anyone who has panda A1 board may try to reproduce the issue. 

If at least two guys may observe no such issue on A1, we can
confirm it is a hardware-dependent issue.

Also we can run memory test in uboot or linux(use memtester) to
see if any hardware related issue can be found about DDR on EA1.
Bryan has one EA1 board, maybe can try it.

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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.