[U-Boot-Users] Ethernet Address

Wolfgang Denk wd at denx.de
Sat Jun 28 09:57:55 CEST 2003

In message <2692A548B75777458914AC89297DD7DA026FADA0 at bronze.dolby.net> you wrote:
> When I first started up my board (ebony) with u-boot, I set the Ethernet
> address incorrectly. Instead of using the colon format
> (00:04:ac:e3:1c:4c) I entered the hex values all together(0004ace31c4c).
> So I think now the Ethernet address environment variable is permanently
> wrong. When I use the command bdi it says ethhaddr =3D 4c:00:00:00:00:00.
> Is there a way to fix this, may be by using the JTAG hardware debugger
> or something?

Assuming you store your environment in flash:

- use "protect off" command to make sector containing the environment
- use "erase" to erase sector containing the environment
- "reset", and the board will come up with it's default environment

Just using "mw 0 0;cp 0 <addr> 1" instead of  the  erase  will  work,
too, as it will overwrite the CRC32 checksum.

If you don;t want to lose  your  existting  environment  definitions,
trickier  approaches  are possible, too: copy the environment to RAM,
edit it using "mm", compute a new checksum and store it to the  start
of  the envrionment (easy to be done with "crc32" command), and write
it back to where you store it (flash, eeprom, etc.).


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Please delete this nonsense, at least when posting to publich mailing

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And *please* do not post HTML!

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
core error - bus dumped

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