[Arm-netbook] rev0 a10 eoma68 board bringup

[Henrik Nordström]

fre 2012-12-21 klockan 22:15 +0000 skrev luke.leighton:

>  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".

Hmm.. have maybe d+/d- been switched? Or shorted? Or perhaps connected
to the wrong pins?

The only parameters FEL should depend on are
- Sufficient CPU voltage
- Correct 3.3V I/O voltage
- Correct clock crystal frequency

>  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.

No sign of life from the UART either?

sunxi-current u-boot SPL activates UART very early. If that too is
failing then it is not a good sign. Early UART operation depends on
- Sufficient CPU voltage
- Reasonable 3.3V I/O voltage
- Reasonable clock crystal frequency

Regards
Henrik