What do you mean by the SMI refuses to POST?
I had plans to dig into OpenBMC to try and make it work on the H12SSL-i. As well as modifying the BIOS. As far as I understand there are 3 pieces of firmware. The BIOS, BMC, and the CPLD/FPGA which handles the glue logic?
Supermicro doesn’t “vendor lock” the CPU through the PSB right? I wasn’t the one to fire up this motherboard for the first time so I don’t know if the screen asking to lock the CPU appears.