Greetings! You have got a great community here.
I was trying to modify the sx710 camera code by making permanent patches in the firmware. I have replaced some strings and patched some code sucessfully, but (of course!) at the end I did screw up. My camera does not react to any buttons now.
I have looked at the bootloader code and (as far as I understand) there is a thing called "Rescue Loader" that tries to boot DISKBOOT.BIN/ROMWRITE.BIN/UPGRADER.BIN from an SD-card if
(1) "UART loopback switch ON" and then "UART loopback switch OFF"
(2) main ''gaonisoy" code starts with 0xFFFFFF word (e.g. was "erased" or not present at all) ("Signature is OFF" message)
if booting DISKBOOT.BIN fails it should start some sort of interactive shell "\n>> debug shell startted <<\n"
Therefore, there are my questions to people who have UART console soldered:
1) Does camera show something on UART when the power is on (e.g. at the moment when a battery is inserted, not on "power" button _press_)
2) What happens if you have UART's RX<->TX shorted (in a loopback). Does it really try load DISKBOOT.bin or shows some sort of a commandline shell?