[ECOS] RE: [iPAQ] Restore CE (or bootldr) from Redboot?

["Hicks, Jamey" <Jamey dot Hicks at compaq dot com>]

That might be the ideal dual boot scenario, but the PocketPC images for
the iPAQ will not run from a flash card -- you have to install them in
flash.

The dual boot configuration that I think is feasible is to be able to
boot either WinCE, installed in Flash, or another operating system such
as Linux from external media such as CF, SD, etc.  

One difficulty in doing this is being able to implement suspend/resume.
The firmware has to be able to decide whether it is resuming WinCE or
Linux before it turns DRAM back on.  (If it is resuming WinCE, the
firmware does not turn on DRAM -- WinCE does).  We need a SA1100
register that we know is used differently by PocketPC and Linux that the
firmware can examine.

Jamey


> -----Original Message-----
> From: Ted Serreyn [mailto:ted@serreyn.com]
> Sent: Tuesday, February 05, 2002 10:15 PM
> Cc: ipaq@handhelds.org; eCos Discussion
> Subject: Re: [iPAQ] Restore CE (or bootldr) from Redboot?
> 
> 
> Ok, how about this,  Given that you ahve redboot installed, is there a
> mechanism to
> just put linux on a flash card and wince on a flash card then 
> switch as
> needed?
> 
> How is this affected by the PocketPC 2002 parrot loader?
> 
> Ted Serreyn
> 
> 
> Gary Thomas wrote:
> 
> > On Tue, 2002-02-05 at 12:12, Hicks, Jamey wrote:
> > > >
> > > > So how does this work?  Is there some way to load the 
> WinCE image into
> > > > RAM and then "boot" it (i.e. run it)?
> > >
> > > The only way to test whether it runs is to load it into 
> flash and jump
> > > to it.
> >
> > Do you load it to some FLASH address other than the start 
> and then run
> > it?  I'm just trying to understand the process so we can 
> work towards an
> > optimal solution/recommendation.
> >
> > >
> > > > For what it's worth, I agree whole-heartedly.  This is 
> exactly why we
> > > > moved to keeping the Parrot (HTC) loader in place, so at
> > > > least the unit
> > > > doesn't become a total brick.  Buying a $50 CF RAM card 
> seems like a
> > > > pretty good investment for such a unit IMHO.
> > >
> > > I agree with this as well, but many of the people who try 
> out Linux on
> > > the iPAQ do not spend the extra money on a sleeve and 
> cards.  If they
> > > did, they might be less inclined to reinstall WinCE.  It's a good
> > > argument for putting USB support into redboot and/or bootldr.
> >
> > What sort of USB support would you expect?  We have the 
> framework ready
> > to be able to make it be a usb-ethernet compatible device.  
> Making it
> > be usb-serial might also be useful.
> >
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> 
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