22 lines
778 B
Bash
Executable File
22 lines
778 B
Bash
Executable File
#!/bin/sh
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#Assign specified interface a fixed, unique Ethernet MAC address constructed
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#from given prefix byte followed by five byte RK3308 CPU serial number
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#Ethernet prefix byte value less 2 should be exactly divisible by 4
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#e.g. (prefix - 2) % 4 == 0
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[ "$2" ] || {
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echo "Specify network interface and first Ethernet address byte in hex" >&2
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exit 1
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}
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cpuSerialNum() {
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#output first 5 bytes of CPU Serial number in hex with a space between each
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#nvmem on RK3308 does not handle multiple simultaneous readers :-(
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nvmem=/sys/bus/nvmem/devices/rockchip-otp0/nvmem
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serNumOffset=20
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/bin/flock -w2 $nvmem /bin/od -An -vtx1 -j $serNumOffset -N 5 $nvmem
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}
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Id=`cpuSerialNum` || exit #fail if Rockchip nvmem not available
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/sbin/ifconfig $1 hw ether $2:`echo $Id | tr ' ' :`
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