Re: [ECOS] In-built shell for Redboot

["wang cui" <iucgnaw at msn dot com>]

I am not a expert in Shell technology, but I'd like to see a general 
purpose shell functionality can be used both in Redboot and app. :-)
Andrew described many necessary requirement of shell in another mail, I 
strongly agree with him.
Could we port a common shell from GNU world? That will be fantastic.

> Would we like to follow the subject "In-built shell for RedBoot" ...
>
> Ah, this idea does scratch the RedBoot body (or spirit? :)! I 
> saw/see
> neither LiloShell nor GrubShell, but, with TAB button on LILO start,
> for example, it's possible to select an `init' process as a 
> parameter.
> Sometimes, they add to parameters 'init=/bin/sh'. It looks like that
> it's possible to add same choice on RedBoot startup to replace 
> default
> RedBoot's CLI loop. It would be a cool feature, but, what do they
> (RedBoot experts) think about?
>
> Though, looking the RedBoot's 'cyg_start' entry, it seems that was 
> done.
> There is one conditional call of the 'cyg_plf_redboot_startup' 
> there. That
> piece has been called before a start of the RedBoot's event loop, 
> while
> (true) {...}. And RedBoot had madden a lot of initial work (all 
> needed
> things for most of us) since a reset. More that, RedBoot gives us an
> abstract I/O with virtual channels (serial, ethernet), TFTP/HTTP 
> clients,
> FLASH support, etc. Therefore, everybody can just put his own event 
> loop
> in his own redboot platform startup function and using the 
> '_rb_gets'
> will have a fun with a lovely interpreter (= shell).
>
> I had a fun with an embedded Tcl shell in RedBoot from that point, 
> for
> example.  Though, there was 'malloc' evil there. Another limitation 
> of
> such "In-built shell for Redboot", there won't be any kernel things 
> there.
> But, for some tasks that's a solution.  Ah, if I would have an 
> objloader
> for ARM like Anthnony has for PowerPC (services/objloader) ...
>
> There is yet another issue with such a tweak, that's the RedBoot's
> 'do_version' call. We cannot hide the RedHat's copyright notice, can 
> we?
>
> Sergei

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