We have a custom board and every component is spec'd to operate at -40C. At temperatures above -30C, I get CCCCCCCC on uart, so I know that it's trying to boot. At lower temperatures I don't get anything on uart.
I have SYSBOOT[5] set to output the clock on CLKOUT1 and it's there. If it's there, does that mean that the AM335X is 'alive' and I should be looking elsewhere for the problem?
I have already taken the SD card out of the equation and that's why I am only looking at the uart output.
The cpu is powered by a tps65217c and it has the right output on LDO_PGOOD and PGOOD. I measured out all the power rails and everything looks good.
Any ideas on what to check next?
Thanks!
