u-boot/board/eets/pdu001
Felix Brack 551f426011 arm: pdu001: Setup pinmux for console UART as early as possible
To make sure we get a working console as soon as possible in the SPL the
UART pins require to be configured earlier. This is especially
true for the pins of UART3, since the PDU001 board uses this UART for
the console by default.

Signed-off-by: Felix Brack <fb@ltec.ch>
2022-02-28 10:33:11 -05:00
..
board.c arm: pdu001: Setup pinmux for console UART as early as possible 2022-02-28 10:33:11 -05:00
board.h SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
Kconfig board: eets: pdu001: Fix wrong default value in Kconfig 2018-05-31 08:53:11 -04:00
MAINTAINERS arm: pdu001: Exend the list of maintained files 2022-02-03 12:15:34 -05:00
Makefile arm: pdu001: Fix early debugging UART 2022-02-28 10:33:11 -05:00
mux.c arm: pdu001: Fix order of include files 2019-02-28 14:21:46 -05:00
README arm: add support for PDU001 2018-01-28 12:27:32 -05:00

# Copyright (C) 2018 EETS GmbH - http://www.eets.ch/
#
# SPDX-License-Identifier: GPL-2.0+
#

Summary
=======

This document covers the PDU001 target.

Hardware
========

The PDU-001 (Processor and Display Unit) is a plugin card for 19" racks. It is
manufactured by EETS GmbH (https://www.eets.ch). The core of the board is a m2
SOM from bytes at work (https://www.bytesatwork.ch) which in turn is based on
AM3352 SOC from TI (http://www.ti.com).

Customization
=============

As usual the console serial interface is set by CONFIG_CONS_INDEX. Best choice
is 4 here since UART3 is wired to the connector K2.
The Run LED on the PDU-001 can be turned on red by setting CONFIG_RUN_LED_RED
or green by setting CONFIG_RUN_LED_GREEN. Setting CONFIG_RUN_LED_OFF will turn
off the Run LED.

Booting
=======

The system boots from either eMMC or SD card cage. It will first try to boot
from the SD card cage. If this fails (missing or unbootable SD card) it will
try to boot from the internal eMMC. The root file system is always expected to
be located in the second partition of the device (eMMC or SD card) that pro-
vided the boot loader.