[ECOS] In-built shell for Redboot

[wang cui]

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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