Update to fix serial port reads

The old serial port read method lost characters from the boot log. This
method works better for me.

- Put get_serial_bootlog arguments into variable names for clarity.
- Fully configure the serial port with stty: disable parity and flow control.
- Change serial port read from reading with 'cat' to reading with 'read'.
- Update help to show current default speed from the variable.

tested under dash, bash, and zsh on several platfoms.

Change-Id: I91ae63a3c226e61019dbdf69c405c3f20ba7db54
Signed-off-by: Martin Roth <>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <>
1 file changed