[U-Boot] Download the u-boot from flash back to PC

[Detlev Zundel <dzu@denx.de>]

Hi Rishi,

> I have a board which has a version of u-boot on it that I would like
> to save before overwriting. I did not flash this version so I do not
> have the source code for it.
>
> I am trying to figure out is there away to essentially do a 'tftp get'
> of the u-boot.bin that was originally written to flash.  I do not see
> any methods to "read" data from U-boot back to the PC.  Is there any
> method to do this?

The only thing that I know of is CONFIG_CMD_SAVES which does a "save S
record over serial line" (check common/cmd_load.c).  It is likely that
your binary U-Boot does noe have this feature though (it is not in
config_cmd_default, so the board maintainer has to define it
explicitely).

When I needed to do this, I could either attach a BDI3000 which can do a
tftp put (remember to create the file on the host first, otherwise it
will fail silently!), or I used a linux kernel that was able to read
U-Boot through the mtd interface.

If you decide to implement a "tftpput" command, I for one would find
this a very nice addition indeed ;)

Cheers
  Detlev

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