README
1# Copyright (C) 2018 EETS GmbH - http://www.eets.ch/
2#
3# SPDX-License-Identifier: GPL-2.0+
4#
5
6Summary
7=======
8
9This document covers the PDU001 target.
10
11Hardware
12========
13
14The PDU-001 (Processor and Display Unit) is a plugin card for 19" racks. It is
15manufactured by EETS GmbH (https://www.eets.ch). The core of the board is a m2
16SOM from bytes at work (https://www.bytesatwork.ch) which in turn is based on
17AM3352 SOC from TI (http://www.ti.com).
18
19Customization
20=============
21
22As usual the console serial interface is set by CONFIG_CONS_INDEX. Best choice
23is 4 here since UART3 is wired to the connector K2.
24The Run LED on the PDU-001 can be turned on red by setting CONFIG_RUN_LED_RED
25or green by setting CONFIG_RUN_LED_GREEN. Setting CONFIG_RUN_LED_OFF will turn
26off the Run LED.
27
28Booting
29=======
30
31The system boots from either eMMC or SD card cage. It will first try to boot
32from the SD card cage. If this fails (missing or unbootable SD card) it will
33try to boot from the internal eMMC. The root file system is always expected to
34be located in the second partition of the device (eMMC or SD card) that pro-
35vided the boot loader.
36