Subject:
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Re: RCX Boot
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 17 Jun 2003 17:51:34 GMT
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Original-From:
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Fauze Valerio Polpeta <fauze@lisha.#Spamcake#ufsc.br>
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Viewed:
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721 times
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Allright but check if I'm right in my concepts!
Compiling a program, just text code, no data, and removing its elf reader
makes that we have instructions at the first byte. So if we upload this
file to RCX it should run. Allright?! (I have the key string in the code!)
At the same way I compiled the same program in srec format and changing
the code of the upload program I saved the image of the data that is
really uploaded to the rcx! (This code runs!!!)
Camparing the elf code and the saved image I see no diference at the start
of the files. Just at the end: the elf file has some bytes more than the
saved image?!
Can you understand me?! Both codes has the key string but I don't know why
the first dont run!!!
Regards
Fauze
On Tue, 17 Jun 2003, Dick Swan wrote:
> "Fauze Valerio Polpeta" <lego-robotics@crynwr.com> wrote in message
> news:Pine.LNX.4.44.0306170818020.10294-100000@sv2.lisha.ufsc.br...
> > However I'm in trouble with the RCX unlock. I thought that the key • string
> > "Do you byte, when I knock?" was just a string searched by a state
> > machine of the RCX firmware download protocol. Is it?! I'm starting • to
> > think not because compiling a program with the gcc, removing the its • elf header
> > and uploading this code to the RCX I've got unlock error. Must be • the
> > key string at the end of the file?
>
> A quirk in the RCX ROM loader is that it only checks address range
> 0x8000 - 0xCC00 for the "Do you byte, when I knock" string. You will
> get unlock failure (i.e. specifically a low buzz sound) if it is not
> found. The download file checksum (sent in the "start firmware
> download" message) is also only calculated for this range so you may
> have to modify this as well.
>
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Message is in Reply To:
 | | Re: RCX Boot
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| "Fauze Valerio Polpeta" <lego-robotics@crynwr.com> wrote in message news:Pine.LNX.4.44.0...ufsc.br... (...) string (...) to (...) elf header (...) the (...) A quirk in the RCX ROM loader is that it only checks address range 0x8000 - 0xCC00 for the (...) (21 years ago, 17-Jun-03, to lugnet.robotics)
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