Resolved! After unplugging ST-Link and reconnecting it I get: Error in initializing ST-LINK device. Reason: (4) No device found on target.
I'm using the STM32H735G DK eval board. Was able to load my code and use the FDCAN ok, when I went on to get the SD-Card going, I found that when reading a block the first 12 bytes would not be transferred. Since I have two boards and so tried the se...