[U-Boot-Users] Accessing mkimage checksum

Wolfgang Denk
2006-04-28T07:38:43Z

In message <20060428070721.31282.qmail@web15909.mail.cnb.yahoo.com> you wrote:
>
> > mkimage does not display the checksum, but it checks
> > it, and you get error messages and appropriate
> > exit code in case of error.
>
> That's not enough in some cases. Factory engineers
> need CRC32 checksum of a ROM image for programming

Both of the checksums stored with the U-Boot image are internal
checksums, which are computed over certain areas in the image. None
of these checksums is goot for use with a programmer.

On the other hand, all programmers I know are capable of computing
the checksum themself.

> verfication. Besides,a stuff like U-Boot/Kernel/
> Rootfs combination cannot be checked by mkimage -l.

Obviously not. But nobody ever clamined that.

> So seems an utility which can check the image's
> CRC32 checksum is better. I used to download the
> stuff to RAM in u-boot and got the result with
> crc32 command:-)

You have different purposes, so other tools are more appropriate for
you. But these tools also exist, i. e. there is no need to write any
new code.

Best regards,

Wolfgang Denk

--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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