[U-Boot] DreamPlug bootloader replacement

[Jason]

On Wed, Apr 20, 2011 at 12:57:10PM -0700, Drassal, Allan wrote:
> I have posted instructions in the following place, please take a look.
> I have been able to do a full dump and reload of the DreamPlug.
> I would be more than happy to entertain any questions.
> 
> http://www.newit.co.uk/forum/index.php/topic,1977.0.html
> 

Awesome!  Thanks for the help.  

> I have also built a current version of openocd (0.4.0) with the
> correct config files.  The trick with the DreamPlug is that openocd
> does not know how to write to the SPI NOR flash, however, you can
> startup off a previous bootloader using the JTAG, and also use the
> JTAG to place the bootloader you want to replace in memory at a
> location, then use the "sf erase" "sf write" commands to replace it.
> 

Yes, that's my backup plan.  It would be nice if openocd could write SPI
flash.

Apparently, they don't know how either (.../target/board/dreamplug.cfg):

proc dreamplug_burn_uboot { } {

        # load u-Boot into RAM and execute it
        sheevaplug_init
        load_image ./u-boot
        load_image u-boot.kwb 0x6400000
#       load_image u-boot.kwb 0x900000
        resume 0x00600000

}

hehehe...

> Please take a look at the post, let me know if you need any of the
> original files from it, or the openocd.  What I would REALLY like to
> do is know how to get U-Boot to build me a new bootloader, if you have
> accomplished this, please share.  I don't know how to edit the
> board/guruplug.cfg file in the U-Boot source tree to match the
> configuration on the DreamPlug, It always freezes on boot right after
> detecting the DRAM size (and it is incorrect).
> 

I'm going to fire off an email to them now.  They usually don't respond,
but it gives me an excuse to call them. ;-)

thx,

Jason.