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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