Hi Prafulla!
I see the complications and understand that it might be difficult to get it running.
On Thu, 3 Sep 2009 07:15:48 -0700 Prafulla Wadaskar prafulla@marvell.com wrote:
I think it could also be useful to be able to produce just the boot header without the U-boot image. For example if you want to place U-boot at some other location on the flash or (as a developer) frequently re-flash U-boot, but don't want to write to the first block all the time (you only need to rewrite it when moving U-boot).
This is not possible. Boot Header is a part of Kirkwood boot image, Header contains u-boot imagesize so for this, first block need to be written each time.
Understandable. On the other hand, it should be possible to pad the U-boot image to some specific size to keep the size constant. Typically to the erase size.
Secondly u-boot header is of 512bytes only whereas minimum sector size could be 4kbytes (typical), so rest part of first sector will be a waste.
I'd be prepared to waste a couple of bytes :-)
Also at the end of boot image checksum need to be calculated on entire image including header.
This is not how I read the documentation. I thought the 32-bit checksum is for the image only, not the headers? Anyway, if it does include the headers, then I see why this would be impossible.
Thanks for the explanation!
// Simon