[PATCH] commands/crc32: add compare 2 files crc

[Jean-Christophe PLAGNIOL-VILLARD]

On 18:08 Wed 22 Sep     , Sascha Hauer wrote:
> On Wed, Sep 22, 2010 at 05:25:49PM +0200, Peter Korsgaard wrote:
> > >>>>> "Sascha" == Sascha Hauer <s.hauer at pengutronix.de> writes:
> > 
> >  Sascha> On Wed, Sep 22, 2010 at 12:36:25PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> >  >> add -F options to compare to file crc
> >  >> 
> >  >> it's usefull to compare what you flash in a partition
> > 
> >  Sascha> Why don't you use memcmp?
> > 
> >  Sascha> memcmp -s uImage -d /dev/nand0.kernel.bb 0 0
> > 
> > It's sometimes interesting to be able to compare a checksum with a file
> > on the host (E.G. output of cksum/md5sum/sha1sum/..)
> 
> crc32 can output the crc checksum of a file using the -f option. What
> Jean-Christophe added is an option to calculate the checksum of two
> files (one given with -f and the other with -F). I just fail to see why
> this must be done in a single step instead of using a crc32 followed by
> a memcmp.
it's faster btw

Best Regards,
J.