Ok, here's some steps to reproduce/debug the issue we are seeing.

1. get latest image from http://cdimage.ubuntu.com/ports/daily-
live/current/ and flash it to a SD card following the instructions at
https://help.ubuntu.com/community/Installation/FromImgFiles.

2. After booting, Run "Install Ubuntu 9.10" by double clicking on the
icon on the desktop.  Follow the prompts for time zone and locale.  Use
the entire drive for install.  To switch to ext3, select "Specify
partitions manually" and create two partitions (root and swap).

3. Once the system is done installing, reboot.  System will startup and
hang once it gets into X.  To get dmesg output, change the fconfid
script by removing "quiet splash" and adding "console=ttymxc0,115200
console=tty0".  To get into a console, add "single" to the kernel
cmdline to boot into rescue mode.

Booting into rescue mode will give you several options including
networking.  This way, you can download and install additional tools
like bonnie++ to run some benchmarking.  YOu can run in this mode
reliably for days without failure.  It is only when starting X that you
will start seeing errors like "end_request: I/O error, dev sda, sector
12859015".

-- 
io/fs errors when launching gdm on imx51 with sata
https://bugs.launchpad.net/bugs/431963
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