On Sun, 10 May 1998, Neil A. Carson wrote:

> David Brownlee wrote:
> 
> >         How feasible would a port to an arm7100 based PDA (such as the
> >         psion 5 or geofox1 ) be?
> 
<snip>
> 
> How would you bootload the thing: Does the GeoFox have some sort of
> device driver interface? Chatting to a guy who aws going to do a Linux
> port to the machines... Certainly with the Psion it was possible to buy
> an EPOC32 developers kit from Psion and then do a device driver to start
> booting stuff, because they run in SVC mode. Is this possible with the
> Geofox too?
> 

Check out 'www.redhat.com/~ed/linux-7110.html'. This is the project home 
page for a Linux port to the EPOC32 platform (ie. Psion Series 5, Geofox 1).

The bootloader (called Arlo) has been written already. It allows 
interrupts to be disabled, and a binary image to be run in SVC mode. As a 
bonus the bootloader also currently allows you to map between physical 
and virtual addresses, and read the contents of memory. The only binary 
I've seen to load writes to the display and then soft-resets the Psion :)

Note that I'm not speaking in any official capacity, I just happen to own 
an S5 and came across the project site a month or two back.

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Howard Johnson  AKA
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