Re: [microblaze-uclinux] netflash, checksum, and u-boot

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Jim,

Jim Van Vorst wrote:

> I'm looking at netflash to upgrade my kernel and I wanted to add the 
> hmacmd5 hash to the image, but there seems to be an order of operations 
> problem.  The vendor common.mak file appends version info to image.bin, 
> then runs the hmacmd5 tool, THEN prepends the u-boot header to create 
> image.ub.  Now u-boot wants to load image.ub from flash (i.e. needs the 
> 64 byte u-boot header) but when I run netflash on the image.ub image the 
> signature check fails since the u-boot header was added AFTER the 
> signature.  I can netflash image.bin but u-boot doesn't like it.
>
> Should the makefile be changed to sign the image.ub file, or should 
> netflash skip the u-boot header before the signature or what?

One way around this is to tell netflash not to do checksum validation - 
just run it without any parameters and the help output will show you the 
right option.

Another option is to tweak your u-boot boocmd so that it does a copy of 
the image.bin from flash to the correct address in memory, and jumps 
directly (u-boot 'go' cmd).

It may be possible to change the order of the operations, so the 
netflash checksum is appended to the image.ub, however that may make 
u-boot unhappy.

Regards,

John

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