Subject:
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LegOS bug - firmware unlock string not below CC00h in some circumstances
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sat, 28 Apr 2001 18:35:39 GMT
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Viewed:
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1376 times
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Just thought I'd better report this...
Firmdl3 is unable to download very large statically linked programs
(with a .text segment greater than 4c00h bytes). Unlike previous size
related bugs, this is *not* caused by firmdl, but rather by kmain.c.
Because the firmware unlock string is declared as a string constant, it
is placed in the data segment, which comes after the text segement. As a
result, it may lie after CC00h in RAM and hence will not be found by the
RCX ROM firmware checking routine. A simple fix (which I am using) is to
rewrite kmain.c so that the string is included in a small assembly
routine near the start of the entry point. There is probably a better of
way of solving this problem, but I'm not familiar with gcc compiler
directives + c tricks in general.
Admittedly this bug probably affects very few people apart from myself,
and I've only recently come across it now my program has reached approx
18k in size (too big to dynamically link). I would report it to
sourceforge, but I don't have web access right now.
Kieran Elby
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