upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/doc/README.serial_multi

1.3 KiB

The support for multiple serial interfaces as implemented is mainly
intended to allow for modem dial-in / dial-out while still being able
to use a serial console on a (different) serial port.

At the moment, the ports must be split on a SMC and a SCC port on a
8xx processor; other configurations are not (yet) supported.

Support for hardware handshake has not been implemented yet (but is
in the works).

*) The default console depends on the keys pressed:
- SMC if keys not pressed (modem not enabled)
- SCC if keys pressed (modem enabled)

*) The console can be switched to SCC by any of the following commands:

setenv stdout serial_scc
setenv stdin serial_scc
setenv stderr serial_scc

*) The console can be switched to SMC by any of the following commands:

setenv stdout serial_smc
setenv stdin serial_smc
setenv stderr serial_smc

*) If a file descriptor is set to "serial" then the current serial device
will be used which, in turn, can be switched by above commands.

*) The baudrate is the same for all serial devices. But it can be switched
just after switching the console:

setenv sout serial_scc; setenv baudrate 38400

After that press 'enter' at the SCC console. Note that baudrates <38400
are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in
include/configs/lwmon.h).