Flashing a CFE to the router without jtag?

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imix7
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PostPosted: Tue Mar 10, 2009 18:31    Post subject: Flashing a CFE to the router without jtag? Reply with quote
hi,

i was wondering if it would be possible to flash the cfe without jtag? cuz, i jtaged mine with the same cfe without changing the MAC. since i'm using it on the same network, i'm haveing a conflict.

please let me know.


thanks
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barryware
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PostPosted: Tue Mar 10, 2009 18:41    Post subject: Reply with quote
Not possible. You can change yur mac via telnet or the admin, command tab.

The macs will stick unless you do a hard reset. A reboot or a power cycle will not change the macs back to the wrong ones.

If you do a hard reset, then you will have to run the commands again.

Or.. My favorite, edit the macs in the cfe with a hex editor and jtag it back into the router.
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redhawk0
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PostPosted: Tue Mar 10, 2009 18:49    Post subject: Reply with quote
There is one other option...it involves the Serial terminal.

If you have serial cable (with +3.3V capability) AND a linux box running tftp server you can do it. (otherwise, JTAG is the best option)

To flash it using Serial port

At the CFE prompt (CFE> )

CFE> flash -noheader 192.168.1.X:cfe.bin flash1.boot


where 192.168.1.X is your linux box address.

This will only work if the CFE is working currently....for those that stumble onto this thread.....

YOU CAN NOT FLASH THE CFE IF YOU DON'T HAVE A WORKING CFE ALREADY ON THE UNIT.


Since you have a working CFE ...just with the wrong MAC address this should work fine.

redhawk
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Donny
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PostPosted: Tue Mar 10, 2009 20:02    Post subject: Reply with quote
Depending on the router, it might be possible to do the cool CFE compressor trick...
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soulstace
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PostPosted: Tue Mar 10, 2009 23:15    Post subject: Reply with quote
may be able to do it with the mtd command.

http://wiki.openwrt.org/OpenWrtDocs/Customizing/Firmware/CFE#1.2.4._Flashing_new_CFE_image
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RolF
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PostPosted: Tue Mar 10, 2009 23:22    Post subject: Reply with quote
soulstace wrote:
may be able to do it with the mtd command.

http://wiki.openwrt.org/OpenWrtDocs/Customizing/Firmware/CFE#1.2.4._Flashing_new_CFE_image



yes, tested and working on wl-500gp :

Code:
mtd unlock cfe
mtd write -f /tmp/cfe_new.bin cfe

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redhawk0
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PostPosted: Tue Mar 10, 2009 23:24    Post subject: Reply with quote
I learn something new everyday....thanx for this information soulstace and RolF


redhawk
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soulstace
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PostPosted: Tue Mar 10, 2009 23:28    Post subject: Reply with quote
thanks RolF, it is interesting to see that it worked Smile
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RolF
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PostPosted: Tue Mar 10, 2009 23:34    Post subject: Reply with quote
soulstace wrote:
thanks RolF, it is interesting to see that it worked Smile


that's why i asked in earler posts why dd-wrt kernel is compiled with writable cfe patrition :)

R.
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soulstace
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PostPosted: Tue Mar 10, 2009 23:36    Post subject: Reply with quote
it's a good question.

seems risky but useful at the same time.

maybe so routers like the ones that run vxworks can be reverted.
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barryware
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PostPosted: Tue Mar 10, 2009 23:38    Post subject: Reply with quote
So I'm clear...

You have to have a working cfe on the unit so it will accept the commands... Yes?

If your router is fubar, can't ping, lan lights all lit, you still need jtag right?

The op just wants to change his macs so if the router has a working cfe, he could use the procedure.
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RolF
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PostPosted: Tue Mar 10, 2009 23:40    Post subject: Reply with quote
@soulstace

yes, i got exactly same answer from redhawk0 earler , but we always can hawe simple "service" build for this purposes and all other "normal" builds with protected cfe :)

R.
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redhawk0
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PostPosted: Tue Mar 10, 2009 23:43    Post subject: Reply with quote
barryware wrote:
So I'm clear...

You have to have a working cfe on the unit so it will accept the commands... Yes?

If your router is fubar, can't ping, lan lights all lit, you still need jtag right?

The op just wants to change his macs so if the router has a working cfe, he could use the procedure.


Yes...must be a working CFE to get this to work.

The OP just has a few undesireable variables...they can be changed then dumped back on using this method.

JTAG otherwise.

redhawk
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imix7
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PostPosted: Thu Mar 12, 2009 13:04    Post subject: Reply with quote
thanks guys... i tried it and it worked. i've got one more question. how do i edit the MAC address in the cfe? i tired to search for the MAC using hex edit, but i couldn't find it. thanks again.
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redhawk0
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PostPosted: Thu Mar 12, 2009 13:08    Post subject: Reply with quote
imix7 wrote:
thanks guys... i tried it and it worked. i've got one more question. how do i edit the MAC address in the cfe? i tired to search for the MAC using hex edit, but i couldn't find it. thanks again.


All CFEs are a little different. You never said what router it is.

If you send me your CFE and your MAC address in a PM...I'll embed it for you.

redhawk
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