Currently, I’m evaluating the Colibri T20 (1.1 C) on Iris (1.1 A) base board, and I’m facing some problems with the UART-A (X13).
I tried to connect to the target board from my linux (arch) host system over UART, to flash new system images (Colibri_T20_LinuxImageV2.6) into the on-board flash, after executing u-boot with the provided USB flasher (tegrarcm / with “sudo ./update.sh -r 512 -v V1_1 -b nand -d”).
In recovery mode (jumper JP1 set) I can load and run u-boot as it seems, but when I try to connect to the serial console, I only can see “garbage characters” coming in on the console.
I’ve tried this with 5V Sparkfun FTDI breakout board, by connecting only RX/TX, and in a second test, also with all “null modem” wires hooked up. I’ve assumed 115200/8-N-1 (“picocom --baud 115200 /dev/ttyUSB0”), but tested it with other settings as well, but with no luck yet.
The behavior is this: I can see an infinite stream of scrabled characters after power cycling the board. With all null modem lines connected, it stops after loading u-boot (assumingly). Sending keystrokes has no effect… either my USB-to-serial hardware is broken (unlikely, it works in other situations), the connections are wrong or the there’s problem on the Iris/Colibri board. No idea yet…
Any suggestions would be appreciated a lot.
EDIT: The board itself works, before trying to update the OS, it ran an older version of Windows CE without any problems whatsoever.