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In lugnet.robotics.nxt.nxthacking, Juergen Stuber wrote:
> Hi Christian,
>
> "Christian Mock" <chrimo-@-moccy.xdsnet.de> writes:
> >
> > yes this is a trivial job, but what should I learn from this packets ?
>
> if you have an endianness problem it should be visible.
> The easiest would be to compare it with a little-endian machine.
>
> > fwflash returns no error back to commandline ...
> >
> > Does this mean fwflash works blindly and returns no
> > protocol or packet errors ?
>
> It uses the SAM-BA protocol, which is rather simple and without
> error checking, more like what a human would type on a command line,
> except that some parts are in binary.
> It is documented in the AT91SAM7S data sheet.
> Basically it allows to access memory and start programs on the device.
>
> Flashing is done by loading a small program into memory
> for flashing a page, then for each page the data is loaded
> and the routine for flashing is executed on the data.
>
> > Why is the result "success" ???
>
> As far as I remember there is no error checking,
> which explains why error sometimes go undetected
> and the NXT doesn't boot.
> Error checking could be added, though.
>
> > I hoped that anybody of the "creators" have done this
> > before, or is nobody using fwflash with the NXT ?
>
> I used the version in NXJ successfully both for the NXT and
> for an AT91SAM7S-EK evaluation board, which uses the same processor.
>
> But you could be the first to use it on a big endian machine ...
>
>
> Jürgen
Hi Jürgen,
just for information:
nxjflash has the same problems at PPC and SPARC ;-(
Next week I try to get a little endian machine and try it again...
Thanx for your detailed informations
Bye
Christian
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Message is in Reply To:
 | | Re: Alternate NXT-Firmware flashing tools
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| Hi Christian, (...) if you have an endianness problem it should be visible. The easiest would be to compare it with a little-endian machine. (...) It uses the SAM-BA protocol, which is rather simple and without error checking, more like what a human (...) (17 years ago, 28-Jul-07, to lugnet.robotics.nxt.nxthacking)
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