Linux/AM3359: UART boot shows 's' instead of 'C'

of course it is 115200-8-N-1

anymore idea?

Is this a custom board?

yes,
but the CCCC was working... i don't know why it stopped.

Have you done any changes to the board? Especially crystals or SYSBOOT configuration?

actually the HW guys made changes.
i don't know about the crystals but the sysboot is something fixed with EMMC and UART.

again, it was working last week. with "CCCCC". i don't know why it started to have "ssssss" instead.

bit 15 is 0
bit 14 is 1

is it ok?

all sysboot from 15 to 0 is: 0100-0101-0011-1100

01b means a 24MHz crystal. Is this correct? Have you checked that these two signals are really 01b at reset release time?

the board passed HW checking.
as i said, the "CCCCC" worked up untill last weekend.
starting today, it shows "sssssCsssssssssssssssCsssss".

any idea why? i didn't changed the cystals. it not something that didn't worked from the start. i'm working with the board for the last few weeks and everythime the boot was fine with "CCCCCC...."

You mentioned that your HW people have worked on the board. This behavior can be caused by unstable/wrong crystal frequency, bad UART connection or some problem with the Host PC. The AM335x itself seems to be OK.

the board is already in it final version. i got it after the HW guys finished to worked on it and it passed all their checking.
i guess something happened to the board :-(
i don't see how it changed from last week to today.
i will try to get a new board.