upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/tools/gen_eth_addr.c

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/*
* (C) Copyright 2001
* Murray Jensen <Murray.Jensen@cmst.csiro.au>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
int
main(int argc, char *argv[])
{
unsigned long ethaddr_low, ethaddr_high;
srand(time(0) + (getpid() << 8));
/*
* setting the 2nd LSB in the most significant byte of
* the address makes it a locally administered ethernet
* address
*/
ethaddr_high = (rand() & 0xfeff) | 0x0200;
ethaddr_low = rand();
printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
ethaddr_high >> 8, ethaddr_high & 0xff,
ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
(ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);
return (0);
}