45 lines
1.1 KiB
Bash
45 lines
1.1 KiB
Bash
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#!/bin/sh
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#
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# Set Ethernet MAC address based on EEPROM settings.
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#
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start() {
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# Read "ethaddr" variable from U-Boot environment in EEPROM.
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#
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# Environment starts at address 0x1800 and is 1024 bytes long.
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# The environment consists of "key=value" pairs, separated by 0x00 bytes.
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#
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ethaddr_pair="$( dd if=/sys/bus/i2c/devices/0-0050/eeprom bs=1k skip=6 count=1 status=none | tr '\000' '\n' | grep ^ethaddr= )"
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if [ -z "${ethaddr_pair}" ]; then
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echo "ERROR: ethaddr not found in EEPROM enviroment" >&2
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exit 1
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fi
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ethaddr="${ethaddr_pair#ethaddr=}"
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# Check that ethaddr variable is well-formed.
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if [ -n "${ethaddr##[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]:[0-9a-fA-F][0-9a-fA-F]}" ]; then
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echo "ERROR: Invalid ethaddr found in EEPROM enviroment" >&2
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exit 1
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fi
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echo "Setting MAC address ${ethaddr}"
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# Configure MAC address
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ip link set dev eth0 addr ${ethaddr}
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}
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case "$1" in
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start)
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start
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;;
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stop|restart|reload)
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;;
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*)
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echo "Usage: $0 start"
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exit 1
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esac
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