Thread by @rqou_

I procrastinated for way too long and apparently now I'm running low on time to do some frivolous stunt hacking

step 0: my microsd card died??

status: I downloaded the wrong image, because apparently an x86 raspbian exists for some reason?

I am good engineer I swear

a bunch of waiting for slow SD cards and connecting wires later and I'm back to where I left off *checks calendar* over a year ago

RPi3B+ acting as JTAG adapter talking to the PXA255 on the target

status: I copied the SDRAM init code from the existing bootloader. it seems to work? I should in theory be able to load a custom binary into RAM using GDB at this point. (debugging this chip is extremely unreliable and I'm not sure why yet)

I can run my own code! I can't output anything yet, but I can use a classic embedded debugging technique of "write debug strings into a memory buffer."

one objective is to access the internal sd card slot so I can load more code faster and with fewer bit errors than via jtag