[Arm-netbook] rev0 a10 eoma68 board bringup

[luke.leighton]

On Fri, Dec 21, 2012 at 9:47 PM, Henrik Nordström
<henrik at henriknordstrom.net> wrote:
> fre 2012-12-21 klockan 18:31 +0000 skrev luke.leighton:
>> ok, after rather a lot of poking about with my little £70 maplin's
>> oscilloscope i've been able to confirm that the power's all ok, so i
>> decided to just wing it and, in the very early spl bootloader code
>> (thanks to henrik et al) i set one of the GPIO pins to 0 on one boot
>> then modified it to 1 on the next boot, from SD/MMC.  guess what: the
>> pin changed, yaay.
>
> So SD is booting. That's a step forward.
>
> I am still very confused on why FEL mode is not working for you.

 it's going into FEL mode all right - it's that when it's in FEL mode
and you plug it in you get "USB device not accepting address, error
-77" or something like that, which is a definite "oops".

 what i'm going to do is to use this to find out the point at which
loading is failing.  keep moving the GPIO set to a point in the code
where it stops happening.  repeat and use binary search to find the
function which goes tits-up.

> If SD
> booting is working then there is an image forcing FEL mode in
> sunxi-tools.

 ah hmm i wonder if that's worth trying.

> Debugging the board from FEL mode is a whole lot easier than swapping SD
> cards all the time.

 tell me about it!