[Arm-netbook] CT-PC89E - success replicating boot from SDcard with switch in NON-factory-default setting

[Luke Kenneth Casson Leighton]

On Wed, Mar 24, 2010 at 1:17 PM, Adam Gill <madallig at gmail.com> wrote:
> are you saying now i can recover my machine ...?

 yes as long as it's not damaged.  follow the instructions below, as a
first test.  perform the three commands (actually you only need the
one - the dd command - because you already have the copy bunzip'd 96mb
file).

l.

>
>
> Luke Kenneth Casson Leighton wrote:
>
> you MUST use a 2gb SDcard for this to work, so if you use fdisk, it
> must show the same params as here:
>
> # fdisk /dev/mmcblk0
>
> Command (m for help): p
>
> Disk /dev/mmcblk0: 1977 MB, 1977614336 bytes
> 61 heads, 62 sectors/track, 1021 cylinders
> Units = cylinders of 3782 * 512 = 1936384 bytes
>
>
> if you have exactly that, then the following will work.
>
> # wget http://lkcl.net/arm_systems/CT-PC89E/mmblk0p1.bz2
> # bunzip2 mmcblk0p1.bz2
> # dd if=/opt/cross-tools/mid-linux/
> mmcblk0p1 of=/dev/mmcblk0 seek=3672000 bs=512
>
>
> you can basically do that _without_ formatting the SDcard.  no
> partitions required, nothing, because the hardware actually reads
> directly from the SD card.
>
> the only reason for creating the "top" partition is for safety
> reasons, to make sure that nobody overwrites the u-boot, kernel etc.
>
> but - fuckit.  if you want to do a quick test, grab the copy of
> mmcblk0p1 which someone made (teis?  can't remember) a while back,
> shove it on the 2gb SD card, and go.
>
> this is _extremely_ good news, because it means that it's now possible
> to a) safely begin reverse-engineering u-boot b) safely recover any
> bricked machine
>
> l.
>
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