Patch merged into coreboot/master: pcengines/apu1: Add RS485 configuration

the following patch was just integrated into master:
commit e1c36aecd8c5ad580595da58e180b06195df5f00
Author: Kyösti Mälkki 
Date:   Tue Oct 13 15:01:15 2015 +0300

pcengines/apu1: Add RS485 configuration

In RS485 mode RTS line acts as a transceiver direction control.

The datasheet is not very clear about the polarity but register setting
    here is tested to drive nRTS line high when transmitting.

Also note revision of B of the super-IO has errata and 8N1 setting does
    not work properly, you would need revision C of the chip assembled to
    fix this.

Change-Id: I705fe0c5a5f8369b0a9358a64c74500238b5c4ba
    Signed-off-by: Kyösti Mälkki 
    Reviewed-on: https://review.coreboot.org/14998
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Felix Held

See https://review.coreboot.org/14998 for details.

-gerrit