[U-Boot] howto write uboot to nand

[U-Boot] howto write uboot to nand

[kqt4at5v at gmail.com]

I thought I should ask before I screw this up. I have a new uboot that I 
load with kwboot. It works fine and I want to write it to nand. I see many 
references to write it after loading with tftp but not kwboot. Can I do 
this? How? This is to a Guruplug. Using tftp

tftp 0x6400000 u-boot.kwb
nand erase 0x00000000 0x0100000
nand write 0x6400000 0x0000000 0x80000

Richard

[U-Boot] howto write uboot to nand

[Scott Wood]

On 06/28/2013 03:15:03 PM, kqt4at5v at gmail.com wrote:
> I thought I should ask before I screw this up. I have a new uboot  
> that I load with kwboot. It works fine and I want to write it to  
> nand. I see many references to write it after loading with tftp but  
> not kwboot. Can I do this? How? This is to a Guruplug. Using tftp
> 
> tftp 0x6400000 u-boot.kwb
> nand erase 0x00000000 0x0100000
> nand write 0x6400000 0x0000000 0x80000

I'm not familiar with guruplug or kwboot (if you want an answer from  
someone who is, you should put it in the subject line) -- but assuming  
the image is supposed to be written to the beginning of NAND, the  
commands look good.

I'm curious why you erase 1 MiB but only write 512 KiB, though.  Even  
if your erase block size really is that large, the "nand erase" command  
will round up (so you can use $filesize if you want).

-Scott

[U-Boot] howto write uboot to nand

[Jason Cooper]

On Fri, Jun 28, 2013 at 03:15:03PM -0500, kqt4at5v at gmail.com wrote:
> I thought I should ask before I screw this up. I have a new uboot
> that I load with kwboot. It works fine and I want to write it to
> nand. I see many references to write it after loading with tftp but
> not kwboot. Can I do this? How? This is to a Guruplug. Using tftp
> 
> tftp 0x6400000 u-boot.kwb
> nand erase 0x00000000 0x0100000
> nand write 0x6400000 0x0000000 0x80000

Well, I typically use openocd and the jtag board to do the same thing.
I'll use openocd to load and execute the new version of u-boot that I
built, and then from that new u-boot, I'll transfer the .kwb image I
want to burn to flash.

So, basically, you can just use tftp like you outlined above, but from
the new image you loaded and executed via kwboot.

Ultimately, you're responsible if it breaks.  No response here is going
to mitigate that ;-)

hth,

Jason.