Re: [microblaze-uclinux] Changing ethernet MAC for production (speeding up the process)

[hoefle marco <marco.hoefle@xxxxxxxxxxxxx>]

Hi Michal,
> > Imagine if we need 100 or even more :-)
> > 
> > 
> > The idea would be to get the u-boot image + u-boot configuration on the
> > board via xmd/JTAG and the rest via tftp. If possible everything should
> > be automated.
> 
> yes, it is possible to do it. Passing MAC via command line to board from u-boot
> and u-boot stores mac in variables.
> There is also way when you store mac in any (spi/i2c/normal)flash and your bootloader/kernel
> will read this value from this place.
> 
> All options are possible.
> You have to connect every board to your PC, JTAG + serial, eth if is avaliable(just for speedup)
> and load u-boot, kernel, fs, setting to your board, everything what you need and after "beep"
> un-plug and plug new board.
> It is recommended to do running tests of course.
> 
Hello Michal,
the system is partitioned that way:
mtdblock0 : FPGA config data
mtdblock1 : U-Boot
mtdblock2 : U-Boot env
mtdblock3 : config (I am wondering what config data is stored in there)
mtdblock4 : image
mtdblock5 : jffs2 data


looking at mtdblock2:
# cat /dev/mtdblock2
��sJbaudrate=115200ethaddr=00:00:AF:FE:00:02clobstart=0xa0000000netstart...

So I thought I could use this u-boot environment data as a "golden
image". Thus I copied its content to my PC and edited ethaddr with a hex
editor.
Afterward I copied the environment data with xmd back to the flash.
Booting the board results in a CRC error:

ETHERNET: MAC:00:00:AF:FE:00:02

*** Warning - bad CRC, using default environment

u-boot seems to have a "backup" environment compiled into by the
petalogix tools.

I suppose I need to find out how the CRC is composed or even better how
the whole environment partition needs to be generated.
When ethaddr and macaddr are set correctly the ethernet lite driver
should use the "new" mac address, right?

Cheers,
Marco

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