Hi
I have a couple of boards using AM3352 that ramdom stopped @ CCCCCCC
The board have a Valid NAND Flash properly programmed.
Lifting and turning on/off the power for 10 times; for 3 of this the board do not start and locks to CCCCCCC
So far, I have checked:
1. Power up power sequencing is correct and power is stable;
2. Boot mode selection voltages are correct;
3. SYSBOOT[4:0] = 00010b
4. TRST is locked low
5. The reset line looks OK on the scope happening a fair amount of time after the power si applied and stable
6. AM3352 do not Move any lines of Nand Flash.
PS:
Changing SYSBOOT[4:0] = 10010b
I do not Have this problem (board always starts!!)
but
with not programmed Nand AM3352 do not seek a valid interface for booting ( NAND--> NANDI--> USB0--> UART0 ) and therefore does not allow me to flash NAND over UART.
Where else should I be looking ? Is there an easy way to read the AM3352's mind as to why it doesn't want to begin the boot sequence ?
Many Thanks
M.