Hi im trying to change my mini's mac address (because i found that if i have two mini 2440 on the same network i have problems with the connection ) until now i have try with this command lines: ifconfig eth0 down ifconfig eth0 hw ether 00:11:AA:BB:CC:DD but i have this mistake: ifconfig: siocsifhwaddr operation not supported, what can i do to solve this problem? i hope someone can help me thanks!
MAC addresses are hardwired into the media controller on an ethernet device, usually in a eeprom. they are made to be unique to the device, and are immutable(cannot be changed). try changing the IP addresses instead. the IP addresses are tied to the mac address of the device, and they can be changed.
But, don't the MAC addresses have to be different for the two mini2440s on the same network? Having the same problem!
yes i bought two mini2400 and they have the same mac and differents ip address, if both of them are turn on i have problems when i try to access to one of them Help please !!
The DM9000 does not store a MAC address internally. In the mini2440, the MAC address is typically stored on the onboard I2C EEPROM, and read by the bootloader. Check the documentation of the bootloader, depending on what you are using (vivi, u-boot, barebox). Guillermo
MAC addresses are programmed into the device by the manufacturer. they are tightly controlled so they are guaranteed to be unique per device. if you have two devices with the same MAC then something is very, very wrong. IP addresses are mapped to the MAC address of a particular device and are assigned by the user or by the network software, such as DHCP. ethernet MAC addresses are 6 bytes and usually look like this: 01:23:45:67:89:ab the values between the colon are hexadecimal and are in the range 00:ff IP addresses are four bytes, and are usually written like this: 192.168.0.1 the values between the dots are in decimal and range between 0 and 255. hope this helps!
> if you > have two devices with the same MAC then something is very, very wrong. This topic has come many times in the past. There seem to various workarounds, most of which don't seem to be explained well enough for others to replicate. My understanding is that all mini2440s come with the MAC address of 08:08:11:18:12:27 because the manufacturer did not buy a block of MAC addresses. They used some obsolete Oscilloscope MAC address. Looking forward to be corrected or advised how to actually change the MAC address.
grodriguez, > Check the documentation of the bootloader, depending on what > you are using (vivi, u-boot, barebox). Even changing the MAC address in barebox and saveenv, on re-powering the MAC address reverts to the original. Is there some other way of changing the MAC address using barebox? Thanks, Dave
If you look at the datasheet of DM9000, you will see that MAC address is stored in an optional EEPROM which is not present on the mini. Instead, the MAC address is hardcoded in the kernel. You can change it with your bootloader (u-boot, for the others I don't know)
davef: > Even changing the MAC address in barebox and saveenv, on re-powering the MAC address reverts to the original. What do you have in your Barebox's env/config ? Guillermo
Guillermo, Originally, I had the line "ip=dhcp" commented out. Then because of another issue it was suggested to change that to "ip=none". I see now that doing that also "skips kernel ip configuration". Looks like I need to understand better the implications of changes to this line! ************** #!/bin/sh machine=mini2440 user= # use 'dhcp' to do dhcp in barebox and in kernel # use 'none' if you want to skip kernel ip autoconfiguration ip=none # or set your networking parameters here eth0.ipaddr=192.168.1.230 eth0.netmask=255.255.2555.0 eth0.gateway=192.168.1.1 eth0.serverip=192.168.1.3 eth0.ethaddr=08:08:11:18:12:27 *************** Thank you. Dave
Dave, Actually ip=none should not have any effect on the MAC address. I have just verified that if I change the MAC address in env/config, even with ip=none, the DM9000 gets properly configured: [...] dm9000 Ethernet Driver, V1.31 eth0: dm9000e at c485e300,c4860304 IRQ 51 MAC: aa:bb:cc:dd:ee:ff (chip) [...] Doesn't this work for you? Guillermo
@strgezer: > MAC addresses are hardwired into the media controller on an ethernet > device, usually in a eeprom. they are made to be unique to the device, > and are immutable(cannot be changed). [...] > MAC addresses are programmed into the device by the manufacturer. they are > tightly controlled so they are guaranteed to be unique per device. if you > have two devices with the same MAC then something is very, very wrong. Normally MAC addresses are not hardwired on the Ethernet device itself (this would require on-chip non-volatile storage, thus increasing cost), but actually stored on some kind of onboard non-volatile memory (flash, EEPROM, battery backed SRAM -- depends on the board). While it is true that MAC addresses are not meant to be "configured" or changed by end users, in most cases they are not "immutable" at all. Also on dev boards like the mini2440 it is kind of normal that the MAC address is not pre-programmed, so depending on how the bootloader is configured you may very well end up with a "fallback" MAC address which may be the same for all boards. Guillermo
> Doesn't this work for you? Well, it didn't the first time I tried . . . using the Pengutronix distro, just edit /env/config, CTRL D and saveenv and this time it works! Would be nice to know why, however thank you for persisting. With ip=none when I changed the ip address in /env/config that didn't work. I had to go into /etc/network/interfaces and change it there. Now two mini2440s talk to each other using a cross-over cable. Cheers, Dave
Dave, Yes, the MAC address and IP configuration are handled differently: IP configuration: This is passed by Barebox to the kernel via the kernel command line (bootargs). If you pass ip=none to the Linux kernel, then it will skip IP configuration at boot time, which then needs to be done after the boot process completes (for example in a startup script that reads /etc/network/interfaces) MAC address: If I understand correctly Barebox will configure the DM9000 registers with the specified MAC address. Then, when Linux boots, the Linux DM9000 device driver will use the MAC address that is already configured in the chip. Guillermo
HI the solution that you found, does it only works on barebox? "I change the MAC address in env/config, even" im using supervivi and i need to change that mac, for now im going to read documentation about supervivi. at least someone have already done it. i wait for advices thanks!
Guillermo, Thank you for explaining the process in more detail. When I said, "Would be nice to know why . . ." I was referring to the frustration caused by not knowing what fixed a particular problem :) Andres, http://groups.google.com/group/mini2440/browse_thread/thread/9d458655b9f... and there are about 10 pages of hits on this site. Good luck
hi i have been looking for where supervivi store the mac and i found the
file on
vivi/drivers/cs8900.c
the function its this:
void cs8900_get_enetaddr (uchar *addr)
{
int i;
/* verify chip id */
if (get_reg_init_bus(PP_ChipID) != 0x630e)
return;
eth_reset();
if ((get_reg(PP_SelfST) & (PP_SelfSTAT_EEPROM | PP_SelfSTAT_EEPROM_OK))
==
(PP_SelfSTAT_EEPROM|PP_SelfSTAT_EEPROM_OK)) {
/* Load the MAC from EEPROM */
for (i=0; i<6/2; i++) {
unsigned int Addr;
Addr = get_reg(PP_IA+i*2);
addr[i*2] = Addr & 0xFF;
addr[i*2+1] = Addr >> 8;
}
}
}
how ever im not very good on c language so any help could be useful for me,
im going to study what do i have to change and how super vivi works firts.
i think that im step on where i have to work
Thanks for the help
hi i try to change the mac address from u-boot, i fail on that but here are the steps i did, may be someone find some mistake or giveme some ideas. my mini2440 has already install supervivi and qtopia (normal installation ) after that i enter to bios (to this menu) ##### FriendlyARM BIOS for 2440 ##### [x] bon part 0 320k 2368k [v] Download vivi [k] Download linux kernel [y] Download root_yaffs image [c] Download root_cramfs image [a] Absolute User Application [n] Download Nboot [e] Download Eboot [i] Download WinCE NK.nb0 [w] Download WinCE NK.bin [d] Download & Run [f] Format the nand flash [p] Partition for Linux [b] Boot the system [s] Set the boot parameters [t] Print the TOC struct of wince [u] Backup NAND Flash to HOST through USB(upload) [r] Restore NAND Flash from HOST through USB [q] Goto shell of vivi Enter your selection: q then: load ram 0x31000000 242332 u and after that i upload teh file uboot.128 bin go 0x31000000 and after that i am on the uboot menu then i enter this comand line MINI2440 # set ethaddr 08:00:2f:00:00:02 #i saved my configuration: MINI2440 # saveenv after that i reboot my mini2440, but when i checked my mac (ifconfig) i found that i didnt change anything. i hope that someone can help me, thanks!
MAC address setting was stored inside the file "/etc/eth0-setting", the settings will use to set the eth0 device during boot by script "/etc/init.d/ifconfig-eth0" (called from "/etc/init.d/rcS"). you just edit the MAC address value inside the file, that's all.
thanks for the idea but it doesnt work, i modified that file and change the line: ifconfig eth0 hw ether $mac for this ifconfig eth0 hw ether 00:00:11:33:AA:BB But it continues with the same mistake: siocsifhwaddr operation not supported
hi read all the eeprom but i didtn find the mac address, then where i can change it? help my boot system its supervivi
Hi finally i found the solution, i have to modified the driver cs8900 on drivers/net and after that compile my kernel again i hope this can be useful for someone else THanks for the help
Although solved, did you try this without the :'s? su ifconfig eth0 down ifconfig eth0 hw ether 0011AABBCCDD