Subject:
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RE: legOS ... really a stack question
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 2 Jan 1999 23:38:31 GMT
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Original-From:
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Allen Martin <arm@rendition.com^spamcake^>
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Viewed:
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1527 times
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> One problem I noticed with LegOS is that it does not zero the .bss
> section, which I believe contains uninitialized global data.
.bss also contains global data initialized to 0, which is even worse if it's
not cleared.
-Allen
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | RE: legOS ... really a stack question
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| (...) Good point, I will add the code to clear it to my crt0.s before calling constructors: mov.w #__bss,r2 mov.w #__end,r3 sub.b r0l,r0l cmp.w r3,r2 bhs .Lbss_done .Lmore_bss: mov.b r0l,@r2 adds #1,r2 cmp.w r3,r2 blo .Lmore_bss .Lbss_done: ... John (...) (26 years ago, 3-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: legOS ... really a stack question
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| (...) All off-chip accesses to f000 or higher are memory mapped to the motors. Because accesses to addresses above fb7f are all on-chip or invalid, the motors are effectively memory mapped to f000-fb7f. (...) What are your symptoms again? One (...) (26 years ago, 2-Jan-99, to lugnet.robotics)
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