xref: /OK3568_Linux_fs/u-boot/tools/gen_eth_addr.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun  * (C) Copyright 2001
3*4882a593Smuzhiyun  * Murray Jensen <Murray.Jensen@cmst.csiro.au>
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * SPDX-License-Identifier:	GPL-2.0+
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun #include <stdio.h>
9*4882a593Smuzhiyun #include <stdlib.h>
10*4882a593Smuzhiyun #include <unistd.h>
11*4882a593Smuzhiyun #include <time.h>
12*4882a593Smuzhiyun 
13*4882a593Smuzhiyun int
main(int argc,char * argv[])14*4882a593Smuzhiyun main(int argc, char *argv[])
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun     unsigned long ethaddr_low, ethaddr_high;
17*4882a593Smuzhiyun 
18*4882a593Smuzhiyun     srand(time(0) + (getpid() << 8));
19*4882a593Smuzhiyun 
20*4882a593Smuzhiyun     /*
21*4882a593Smuzhiyun      * setting the 2nd LSB in the most significant byte of
22*4882a593Smuzhiyun      * the address makes it a locally administered ethernet
23*4882a593Smuzhiyun      * address
24*4882a593Smuzhiyun      */
25*4882a593Smuzhiyun     ethaddr_high = (rand() & 0xfeff) | 0x0200;
26*4882a593Smuzhiyun     ethaddr_low = rand();
27*4882a593Smuzhiyun 
28*4882a593Smuzhiyun     printf("%02lx:%02lx:%02lx:%02lx:%02lx:%02lx\n",
29*4882a593Smuzhiyun 	ethaddr_high >> 8, ethaddr_high & 0xff,
30*4882a593Smuzhiyun 	ethaddr_low >> 24, (ethaddr_low >> 16) & 0xff,
31*4882a593Smuzhiyun 	(ethaddr_low >> 8) & 0xff, ethaddr_low & 0xff);
32*4882a593Smuzhiyun 
33*4882a593Smuzhiyun     return (0);
34*4882a593Smuzhiyun }
35