Re: Flashboard for a 720

Dnia 27-06-2006, wto o godzinie 09:37 +0200, Adam Pribyl napisał(a):
> On Fri, 23 Jun 2006, Filip Zyzniewski wrote:
> 
> > How about using tiny 32kB flash just for a bootloader capable of loading
> > second stage bootloader from a CF card?
> 
> This is interesting option. In first 32k of ROM now resides the WinCE 
> boot/resuume loader. I do not think wince will survive replacing this 
> part.

Why would we want wince survival? I bought a spare ROM board for
experiments.

> Moreover - we do not have suitable bootloader for linux to boot from 
> CF. I've read something bootldr maybe can boot from CF, but its size is 
> more than 200kB. 

Even dumb one utilizing only first CF slot? The most space-eating thing
would be a PCMCIA init and IDE-cs interface... Do you think that such
bootloader cannot fit in 32kB?

> Also, if we make a flash to J720, then the main reason 
> should be to have suspend/resume working. Otherwise it makes not much 
> sense, as wince is also a kind of semiinteligent linux loader.

How is suspend/resume achieved with HP's flash boards and linux?
Does jornada always start at 0x0 after resume? Maybe we could put a flag
somewhere like "system is in memory, jump -> here to resume it" for a
bootloader?

> 
> 
> BTW: the boards in J720 are pretty fragile, with lot of layers in very 
> thin PCB.

I am aware of that and already scared ;).


What do you think about already mentioned here idea in my other mail
(memory mapped CF on a flashboard)?


bye,
Filip Zyzniewski