[jornada] bootrom?

Hi,

Yes most of the datasheet(s) I already have. The only problem is that I
can't find any for the ROM chips used. As I remember correctly MX23L......
something.
Another problem is that the connector pin-out on the flashboard does'nt seem
to be complete. when i look at the original and compare it with the
flashboard there are some connections missing. for example the CS0 it's not
connected at the original or i have miscounted. :)

But I think this idea could work else the flashboard design would not work.
am i wrong? that also gives me the idea that there probbably is'nt any boot
rom on the jornada it self.

The main reason for modifying the original flashboard is that you don't need
to redesign/build/sell it. I think lots of people have tried it. they
begain, figured out its hard to get the components and that making a PCB
isnt that cheap/easy as it seems. don't even mention the molex connector. I
tried at molex, but they gave no anwser or samples to me.

Could you help me with the datascheet of the ROM? what chip number is on
your ROM. (maybe it's different and more easy to find)

Cheers,

Ernest.

----- Original Message -----
From: "Sebastian Hesselbarth" <sebastian.hesselbarth_at_stud.uni-hannover.de>
To: <e.houtzager2_at_chello.nl>
Sent: Friday, January 21, 2005 5:07 PM
Subject: Re: [jornada] Schematics

> e.houtzager2_at_chello.nl wrote:
>> Hi,
>> I'am looking if it would be possible to modify the original flashboard.
> > When starting the jornada 720 it starts looking in RomBank 0 "CS0 is
> enabled".
>> I would like to see if it's possible to disable rom Bank 0 and reroute
>> the CS0 signal to an new small reprogrammable rom at address 0x0000 which
>> contains the bootloader of somesort to refer to the first address of the
>> Flash. you could even put in a switch to select from which you want to
>> load.
>>
>> I don't know if it's possible anyway but thats what i am figuring out.
>>
>> Cheers,
>> Ernest.
>
>>>http://www.handhelds.org/download/projects/jornada/720/
>
> Now I understand! ;)
> Default behavior of the SA1100 is to jump at "address 0" (logically mapped
> somewhere else) if I remember what I have read in the dev manual. Cannot
> assure that j720 does not contain a small "pre-boot" ROM itself but if you
> want to try take a look at the flashable board design. the pins of the
> molex connector are documented there, so you know where to find
> CE-signals.
> Additionally it would be helpful to get all device's datasheets from web
> to know where some of the signals go to. I once had all of the datasheets
> here but my hdd crashed some weeks ago.
> Some problem you might encounter is that j720 wants 32-bit data so you
> have to use two 16bit or four 8bit ROMs to provide full data. Another
> possibility would be to redesign the current flashboard with some more
> recent flash devices. it quite impossible to get your hands on those
> strata flashes...
>
> Sebastian
>
Received on Fri Jan 21 2005 - 14:28:38 EST