[AT91RM9200-DK] Can't overwrite "ethaddr"

katolecho · **Posted:** Wed Mar 09, 2005 10:53 am

hi all
being a newbie in the use of the AT91RM9200-DK, i have to install a linux distrib that support the ethernet connection and use an OSGI on he bord (and after make our selfboard)
so i build the kernel, use a ramdisk
all is right at this time
next, i tried to set up the eth0 interface and i have a problem:

Code:

[root@AT91RM9200DK /root]$ifconfig eth0 172.25.1.100 up
SIOCSIFFLAGS: Cannot assign requested address
SIOCSIFFLAGS: Cannot assign requested address

so i checked with ifconfig -a the interface

Code:

[root@AT91RM9200DK /root]$ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          Interrupt:24 Base address:0xc000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0

the interface have a slight problem with its adress Mac
next i checked it up under Uboot and I saw something strange

Code:

Uboot> printenv
bootdelay=3
baudrate=115200
env=ethaddr 01:02:03:04:05
ethaddr=01:02:03:04:05
filesize=5591e6
fileaddr=21100000
bootargs=root=/dev/ram rw initrd=0x21100000,6000000 ramdisk_size=15360 console=ttyS0,115200 mem=32M
serverip=172.25.1.11
ipaddr=172.25.1.100
stdin=serial
stdout=serial
stderr=serial

so
how can i delete "env=ethaddr 01:02:03:04:05" and after configure ethaddr because if i try a setenv on this variable, i have an errore

Code:

Uboot> setenv ethaddr = 00:0E:99:02:02:29
Can't overwrite "ethaddr"

excuse me for my lack of english and thanks for your help

katolecho

JPMORENO · **Joined:** Tue Feb 24, 2004 6:27 pm **Posts:** 161

Hello,

to overwrite this variable "ethaddr", you must delete first all the environment variables!

> protect off 0x1000E000 0x1000FFFF
> erase 0x1000E000 0x1000FFFF
> protect on 0x1000E000 0x1000FFFF

Of course, it will delete all evironment variables but then you will be able to change the ethaddr variable.

Rgds
JP

katolecho · **Posted:** Thu Mar 10, 2005 10:25 am

thanks for this information
I'll try it as soon as possible

nat · **Posted:** Thu Mar 10, 2005 5:44 pm

Hello,

1)on u-boot the ethernet PHY is not initialised.
You need to made some changes on u-boot:
In lib_arm/board.c source file
In start_armboot() function, set the following lines just before the main
loop (at the end of the function)
#ifdef CONFIG_AT91RM9200DK
eth_init(gd->bd);
#endif

Or enable a tftp download before run your Linux appplication.

2) EMAC address overwrite
on u-boot, include/configs/at91rm9200dk.h file enable the variable:
#define CONFIG_ENV_OVERWRITE 1
Care should be taken as emac physical address is single.

3) FYI: released u-boot version on
http://sourceforge.net/projects/u-boot
on u-boot 1.1.2 version you are able to configure uboot to boot through flash or dataflash:
accordingly update the file include/configs/at91rm9200dk.h

Ciao

katolecho · **Posted:** Thu Mar 17, 2005 10:25 am

due to a lack of time, I found a totally experimental solution

i tryed to overwrite the "ethaddr 01:02:03:04:05" variable
i use the command next line :

Code:

Uboot> setenv ethaddr=01:02:03:04:05:06

and have the result

Code:

Uboot> printenv
bootdelay=3
baudrate=115200
[color=red]env=ethaddr 01:02:03:04:05[/color]
filesize=5591e6
fileaddr=21100000
bootargs=root=/dev/ram rw initrd=0x21100000,6000000 ramdisk_size=15360 console=t
tyS0,115200 mem=32M
serverip=172.25.1.11
ipaddr=172.25.1.100
stdin=serial
stdout=serial
stderr=serial

the variable is still here but now there is no more ethadd variable
so i can write it on the board

Code:

Uboot> setenv ethaddr 01:02:03:04:05:06
Uboot>
Uboot> printenv
bootdelay=3
baudrate=115200
env=ethaddr 01:02:03:04:05
filesize=5591e6
fileaddr=21100000
bootargs=root=/dev/ram rw initrd=0x21100000,6000000 ramdisk_size=15360 console=t
tyS0,115200 mem=32M
serverip=172.25.1.11
ipaddr=172.25.1.100
stdin=serial
stdout=serial
stderr=serial
ethaddr=01:02:03:04:05:06

here we go with linux
ifconfig now show us a real mac adress for eth0 and i can now ping some hosts on the network

i don't know how my solution works and why but by the way, i'll try the other if i still have the problem on our homemade board

thanks for all, i've now to resolv a problem with my own ramdisk
life is obstacles-paved

[AT91RM9200-DK] Can't overwrite "ethaddr"

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