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

[Tom Cubie]

On 02/10/2012 01:35 PM, Tom Cubie wrote:
> 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.

I can get the lcd console either. I have reported to the girl who
workson the display driver the problem. She is not interested and
will not look at it. She said it's no use in products :(

>
>> 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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>
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