The ethernet address of the HiFive Unmatched board is determined here:
board/sifive/unmatched/hifive-platform-i2c-eeprom.c:534:
eth_env_set_enetaddr("ethaddr", e.mac_addr);
According to the code in hifive-platform-i2c-eeprom.c you can write the
MAC address to the device eeprom using the mac command:
mac read_eeprom
mac mac_address 01:02:03:04:05:06
max write_eeprom
I have not tested this!
The code first appeared in commit 946afdf6209e ("board: sifive:
unmatched: add initial support for a platform ID EEPROM") dated June
30th, 2021 and is not contained in release v2021.07.
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https://bugs.launchpad.net/bugs/1937376
Title:
u-boot in impish has unstable mac address
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