[U-Boot] [PATCH 2/3] tools: mkimage (type=kwbimage) kirkwood boot image support

[Wolfgang Denk <wd@denx.de>]

Dear Prafulla Wadaskar,

In message <73173D32E9439E4ABB5151606C3E19E202DDF272E2@SC-VEXCH1.marvell.com> you wrote:
>
> > > +		lineno++;
> > > +		if (!(line[0] != '#' && strlen(line) != 1))
> > > +			continue;
> > 
> > This is a bit simple-minded. This will for example fail on 
> > DOS-formatted files, and for lines that contain only white 
> > space (which still look "empty" to most users and are thus 
> > hard to spot). 
> To take care of Dos formatted file I should use "strlen(line) <= 1" right

Hm...

Normally the use of lex (and eventually yacc) is recommended if you
need a parser - writing parsers in C is a typical "programming" task
(see definition in signature below :-)

If you have an extremely simple syntax, you might for example proceed
like this:

1) drop all lines starting with '#' as comment lines.
2) use strtok_r() to split your lines of input into white-space
   separated tokens.
3) drop all lines with zero tokens (= empty lines)
4) process the rest

[See example in the strtok()/strtok_r() man page).

> As explained in doc.README.kwimage,
> any other line apart from above will be considered as valid configuration l> ine.
> This is bare minimal parsing provided here which is sufficient
...

> > Hmm... it seems you add only image creation code. But "mkimage -l"
> > should work on such an image, too. And "imls" in U-Boot 
> > should be working, too.
> Well I will disable other generic mkimage options including -l for kwbimage ;-)

This makes little sense to me. When we have one command to  build  an
image,  I  definitely want to have a command to check and display the
contents of an image, too, and/or to verify it's integrity.

> Can we add this in second part which is not required too?
> For me great thing is that we can support kwimage generation through mkimage.

I understand your position. I guess you  agree  that  _full_  support
(i.e.  including the ability to check and list and image, both on the
host and on the target) would be even better, and more in  line  with
existing U-Boot code?

Best regards,

Wolfgang Denk

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