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User Guide

COMe-bP5020

6.5.4 Using the Network

6.5.4.1 Interface Selection

U-Boot provides support for multiple Ethernet interfaces for transferring files from a file server. This is accomplished using the

environment variables: “ethprime”, “ethact” and “ethrotate”.

The following table indicates the assignment of the Ethernet interfaces to the COM Express® SerDes signals depending on the

active “sconf” base configuration.

Table 49: Ethernet Interface Assignment Depending on the Base Configuration

6.5.4.1.1 ethprime

“ethprime” is used to select the required interface after power-up or reset. During boot-up, the U-Boot checks if “ethprime” is

set. If set, “ethprime” is used as the first active Ethernet interface (“ethact”). Please note that the setting of the “ethprime”

is lost after a reset. To retain the environment permanently, use the command “saveenv”, which saves the complete environ-

ment to flash.

Example:

BASE CONFIGURATION ETHERNET INTERFACE COM EXPRESS® SIGNALS

1, 4, 5 FM1@DTSEC1 SERDES_TX/RX10+/-

FM1@DTSEC2 SERDES_TX/RX11+/-

FM1@DTSEC3 SERDES_TX/RX12+/-

FM1@DTSEC4 SERDES_TX/RX13+/-

2 FM1@DTSEC1 SERDES_TX/RX10+/-

FM1@DTSEC2 SERDES_TX/RX11+/-

FM1@DTSEC3 SERDES_TX/RX12+/-

FM1@DTSEC4 SERDES_TX/RX13+/-

FM1@TGEC1 SERDES_TX/RX[14..17]+/-

3 FM1@TGEC1 SERDES_TX/RX[10..13]+/-

=> setenv ethprime FM1@DTSEC3

=> saveenv

Saving environment to SPI Flash...

2 MiB

SF: Detected AT25DF161 with page size 256 Bytes, total 2 MiB

Erasing SPI flash...Writing to SPI flash...done

=> reset

...

=> printenv ethact

ethact=FM1@DTSEC3

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 70 71

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Kontron COMe-bP5020 Bedienungsanleitung Seite 58