I followed your advice and tried my flux pen and dragging the iron across the pins. It was definitely much easier and quicker than the solder paste and heat gun I had been using.
I just got both of them working. ;D
I must have removed and re-soldered the SoC 5 times on each board and I still kept getting the same error.
In total frustration I took one of the boards to the kitchen sink and gave it a good scrub with soapy water and a toothbrush.
You would scarcely...
Thankyou that is a huge help. I'm going to go back and very carefully redo the SoC pins.
Ive been looking for the problem on the software/firmware side. The problem occurred in both boards that I made and my thinking was that it would be difficult to repeat the same problem twice on both...
I recently decided to try and make my own scsi2sd v4.2 from the project shared on github. I've managed to build 2 boards and flash a hex file to the cypress chip and then upgrade the firmware.
It's at this stage I've come unstuck. I have not been able to get the board to work on a compact mac...