I am booting dev-4.3 and dev-4.4 on a palmetto using a simple buildroot userspace. I do not see any output on the serial console after rebooting. Using an openbmc userspace this works fine.
The differences in the SCU and SMC (flash) registers are:
| Name |
Address |
openbmc |
buildroot |
| System Reset Control/Status |
0x1e6e203c |
0x00000001 |
0x00000003 |
| Watchdog Reset Selection |
0x1e6e209c |
0x001FDFF3 |
0x003FFFF3 |