 | | Re: malloc() bug found -- BAD MEMORY REGION :-(
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(...) made some tests, and - Yep, it works ! I'd strongly encourage everybody experiencing strange hangups to apply the little fix to mm_init() i suggested. For me, it makes malloc() and dll work perfectly. BTW, there are some minor flaws in dll[x], (...) (25 years ago, 2-Mar-00, to lugnet.robotics.rcx.legos)
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| | malloc() bug found -- BAD MEMORY REGION :-(
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It looks like it's not a bug in legOS, but in the RCX hardware: Memory from 0xfb80 to 0xfd7f is simply NOT WRITEABLE, or more exactly, always read as 0xff, at least on my RCX ! Try the following little test: // // memory test // #include <conio.h> (...) (25 years ago, 1-Mar-00, to lugnet.robotics.rcx.legos)
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| | malloc() bug haunt: getting closer..
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Yesterday evening i found something, that might be the reason for some of the crashes reported lately: The chain of memory blocks used by malloc() has a broken entry, say: the reserved block at 0xfd7c has a length word of 0xfffe. This will cause (...) (25 years ago, 1-Mar-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) afaik, with vanilla legOS-0.2.3, lnp_addressing_write and lnp_integrity_write are not thread-safe, there is a little patch fixing this in the lnpd tarball. (25 years ago, 29-Feb-00, to lugnet.robotics.rcx.legos)
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| | Never mind
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Well, my so-called "working" program crashed again, after adding two sleep statements and two sound calls, neither of which my program actually got to. So, I guess there are other causes behind my hangs as well. Ah the joys. :) -- "Though I am not (...) (25 years ago, 29-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) For me, at least, it's not hanging during dll. My earlier problem was that dll just wouldn't complete with my program, but it didn't crash the RCX. By the way, I think I've found my crashing problem. It looks like I had some LCD calls that (...) (25 years ago, 29-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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Luis Villa <liv@duke.edu> : (...) box (...) for (...) Wow Thanks! Here is the error I am getting-> loading cache ./config.cache checking if compiler cc1obj has been built... yes checking for gcc... h8300-hitachi-hms-gcc checking whether the C (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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I've also been struggling with building the cross compiler. I'm trying to create a DJGPP hosted version. Once I am successful, we will be able to use Markus's legOS on DOS/Windows as-is. Currently, I have to rewrite Makefile.Common, Makefile.Kernel, (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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(...) This may not be the case- the cross-compiler will try to compile something, but at least with the directions most of us use, there is no standard C library created and so the compiler thinks it doesn't work. The trick (then) is to use Markus's (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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"Markus L. Noga" <markus@noga.de> : (...) Thanks! In one of the sections under this document there is a short paragraph explaining that cross compilers may not like having 32 bit ints (Like BeOS uses) turn into 16 bit ints (Like I bet the RCX uses) (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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Jim Jackson <jjackson@jnjackson.com> : (...) GCC-2.95.2 (...) --host=i586-pc-beos (...) This gave me the Idea to tell the configure that I was running a Linux box (instead of a bebox) It almost worked too. At the end of the make the machine says I (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) currently i believe there is some really subtle bug in malloc(), that shows up only under special circumstances. I experience similar problems with a fat kernel/application that disappear after adding one cputw(), making the binary a little (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) Or worse, MacOS. I use and love my Macs, but lord they sure don't have much crash protection right now. I just wish there was a way to avoid having to reload the firmware every time it breaks, but I suppose that without an MMU, that's a bit (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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Are you using gcc-2.95 or the earlier egcs? What's your host machine? I'm running an Intel Pentium (pre-MMX) and Linux and had to specify the additional parameter: --host=i586-pc-linux Not sure whether BeOS is supported where linux is specified (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) I'm afraid that mysterious hangs may be a permanent part of the life of a legOS user- in almost any serious program that I have written, perfectly legitimate code- simple code!- has occasionally caused weird hangs and needed hard reboots. (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) I'm not so sure about my problem either. In fact, I'm getting some mysterious hangs much like you describe now that things are working. Maybe I'll try putting in some cputs or similar. -- "Our doubts are traitors, and make us lose the good we (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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(...) I don't think this was my problem, since other, shorter programs would download fine, just not my 5k monster. -- "Our doubts are traitors, and make us lose the good we oft might win by fearing to attempt." - William Shakespeare Mike Ash - (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Directions to compile GCC
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Hi Bill, this page is captioned "Using and Porting GNU CC". It should give you an overview of the process. (URL) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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I saw the same behavior some time ago when I worked on a pretty fat program (about 6KB compiled code). Sometimes it worked OK, then I removed my debug code (some cputs defined by macros) and it hanged miserably... I thought it was some kind of (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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| | Re: Odd behavior
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I think you may have had the same problem that I did, but if you did, you have answered the question yourself. (...) I had a bright light over the tower, and the batteries in the tower were running low. Redirect the light and install a new battery (...) (25 years ago, 28-Feb-00, to lugnet.robotics.rcx.legos)
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