[Arm-netbook] microSD breakout board, suitable for debugging using tablets.

Tom Cubie tangliang at allwinnertech.com
Fri Feb 10 05:35:54 GMT 2012

On 02/09/2012 04:02 AM, Alejandro Martínez wrote:
>>> You need to modify script.bin for serial output as well. Default for
>>> those pins are SD.
> I know, see the page I linked to :) I also made a tool that will also
> decompile the script.bin back into the .fex plain-text format so it
> can be easily modified and then rebuilt, see
> https://github.com/zenitraM/a10tools

Good job : )

>>> Anyway, after some (failed) attempts of making the tablet boot using the SD
>>> card as boot (so no Chroot needed), and trying it to show a framebuffer
>>> console, became stuck with no output at all from the kernel.
>> can you document this?
> It is easy, the Gingerbread ROMS don't use u-boot but a custom
> bootloader which has the route to the kernel and the parameters passed
> to it on .ini and plain-text files.
> I modified the kernel parameters for the recovery kernel (on a file
> called params_r) to make it use /dev/block/mmcblk0p2 as root instead
> of /dev/block/nandX (can't remember the original letter). But when I
> do so, nothing appears on the screen. I probably need to insert some
> kernel modules (lcd.ko), but as the only possible output (the display)
> is off, I have no way to know what is going on.

Let me check how to get the lcd console on my evb board.

> Compiling my own kernel was easy, though - found a tarball with
> everything and the default configuration worked on the tablet. Anyway,
> the kernel seems to have device-specific stuff on it (regarding
> screen, etc) because other tablet kernel and modules don't work
> properly on mine...
>> considering you can solder (I can not :-/) you may also try
>> http://www.tuxbrain.com/en/oscommerce/products/1898 ... they are here
>> in Spain so shipping will be much faster than sparkfun :)
> Oh, I hadn't seen that one.. anyway the contacts seem too small for my
> limited soldering skills :( The Sparkfun one is easier as I can just
> solder some headers and forget about it.
> And I can also reuse it for talking to a MicroSD with an Arduino.. or
> even use some unused pins on the SD to get serial output with a SD
> inserted.
> Anyway, I ordered it last week so it should come here this week or the next one.
> People on Slatedroid are already working on decrypting and
> reencrypting the boot images/bootloaders for the tablets:
> http://www.slatedroid.com/topic/28942-50-to-the-first-person-to-figure-this-out/page__st__20
> so I think EOMA software development efforts will be quite useful for
> the tablet-hacking community :)
> ---
> Alejandro Martínez
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