RE: [jornada] Jornada 720 flashable board status

Thanks for all of the replies that I have received on this thread.

I was curious since it seemed to be a good way to save on valuable RAM. I
was aware of the performance penalty of running out of Flash but I was
thinking that RAM was smaller then 32MB. For some reason I was thinking
16MB which makes saving the RAM footprint for the kernel much more
important.

Todd Smith <todd.smith@camc.org>

-----Original Message-----
From: John Ankcorn [mailto:jca@hp.com]
Sent: Monday, February 09, 2004 12:08 PM
To: Smith, Todd
Cc: 'jornada@handhelds.org '
Subject: Re: [jornada] Jornada 720 flashable board status

Todd,

For almost all of the handheld systems that I know (Jornada and all
the models of the iPaq), flash memory is quite scarce. This is mainly
due to the fact that you must put all programs that you MIGHT want
to run in flash, but only the programs you are ACTUALLY running
go into RAM.

Because of this, the kernel is gzipped when it is put in flash, reducing
it's size from 1Mb to 500kb. The actual code foot print in main memory
for the kernel itself seems minimal (1Mb out of 32Mb), and it runs much,
much faster from RAM than flash (several times faster).

For both speed and size, unfortunately the kernel is not normally
run Execute-in-place.

Thanks
jca

"Smith, Todd" wrote:

> Hello Noah,
>
> One question about the flashable board. Will it feature Execute-In Place
so
> that the kernel image doesn't have to loaded to RAM?
>
> Thanks for your time.
>
> Todd Smith
> _______________________________________________
> jornada mailing list
> jornada@handhelds.org
> https://handhelds.org/mailman/listinfo/jornada
Received on Mon Feb 09 19:06:52 2004