On Wed, Aug 04, 2010, Daniel Kahn Gillmor wrote:
> when i try to use fw_setenv for the ethaddr variable on a Marvell
> guruplug, i get this error (mac address is anonymized):
> 0 root@moo:~# fw_setenv ethaddr 00:f0:43:XX:XX:XX
> Can't overwrite "ethaddr"
> 1 root@moo:~#
I'm not sure why that's the case, but the latest version of the code in
u-boot seems to be enforcing that you can't change this, nor serial#.
This might be to protect users from shooting themselves in the foot by
destroying potentially valuable data?
/*
* Delete any existing definition
*/
if (oldval) {
/*
* Ethernet Address and serial# can be set only once
*/
if ((strcmp (name, "ethaddr") == 0) ||
(strcmp (name, "serial#") == 0)) {
fprintf (stderr, "Can't overwrite \"%s\"\n", name);
errno = EROFS;
return -1;
}
in which case, maybe we need a force flag
--
Loïc Minier
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