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Jornada 720 Resources (flashboard?)

stingraze Page Icon Posted 2020-10-09 9:40 PM
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I was looking at some things today, and I found this site, which has some files for Jornada 720.

In it, I found a directory called flashboard.
I honestly don't know what it is, but some of you might find it useful.

https://wwwcip.informatik.uni-erlangen.de/~simigern/jornada-7xx/flas...

Lots of Linux stuff till 2008 here:
https://wwwcip.informatik.uni-erlangen.de/~simigern/jornada-7xx
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hpcboy Page Icon Posted 2020-10-10 12:59 AM
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Great find!

Looks like they are for the JLime project

And here in particular there are lots of hardware info and documentations. Maybe useful for the incubating projects (debian/retrofit)?

https://wwwcip.informatik.uni-erlangen.de/~simigern/jornada-7xx/docs...
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_dev-null Page Icon Posted 2020-10-10 12:16 PM
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These flashboard files are for the flashboard PCB.
I already made a few of those, but for initial flashing you need a device that can program the flash chips or the JTAG interface of the SA1110.
I try to trace these pads if i get a faulty mainboard, because i need to desolder the CPU.
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stingraze Page Icon Posted 2020-10-10 12:47 PM
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Thanks for the explanation.

I have a Japanese ARM book that had some things about JTAG. I'll look if it can help. I think it has a really detailed manual of the StrongARM chip in a PDF...
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stingraze Page Icon Posted 2020-12-01 8:30 AM
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Does anyone know what this picture is of the Jornada 720? Is this the flashboard everyone was talking about? I found a zip file containing PCB stuff, so if someone's interested, let me know.

Edited by stingraze 2020-12-01 8:32 AM




(jornada720_memory.jpg)



Attachments
----------------
Attachments jornada720_memory.jpg (107KB - 0 downloads)
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ntware Page Icon Posted 2020-12-01 12:18 PM
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This is HP's original ROM board. The flashboard project was aimed to replace this ROM board with flash chips that could be erased and, for example, hold Linux filesystem instead of WinCE.
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stingraze Page Icon Posted 2020-12-01 2:30 PM
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Thank you for your information.

I found a PDF of all the pinouts of the flashboard or ROM board and it's attached below.

Edited by stingraze 2020-12-01 2:32 PM




Attachments
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Attachments mem720.pdf (19KB - 4 downloads)
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joval Page Icon Posted 2020-12-01 3:15 PM
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Are those the 2 Ram chips that need replacing for the 128Mb upgrade? I purchased 4 of those upgrade chips many months ago...still in their packing wrap...a bit timid on going forward. Any tips on how to de-solder and resolder safely would be appreciated! Thanks in advance!

(Posted from my Jornada 720 running on Devuan/RasPi/Firefox).
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stingraze Page Icon Posted 2020-12-02 12:26 AM
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I believe the PDF I attached above is for the flashboard / ROM board.

28F128J3A x 2 is the Flash chip by Intel.

K4S281632B x 2 is the 128Mbit SDRAM.
(You can buy this here in Japan for 299 JPY)
https://wakamatsu.co.jp/biz/products/detail.php?product_id=17010435

As for how to desolder, a video is here on YouTube at: (Time: 2:18)


I've never desoldered surface mount IC chips before, only experienced in larger DIP ICs.
I think it's best to try it out on other chips first.
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_dev-null Page Icon Posted 2020-12-02 10:28 AM
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Hi!
Samsung K4S511632C-KC75 work! I also use them for my upgrades.
There are also Chips from Micron that work, i got a few from Notebook RAMs. I have to look for the exact model number.

http://www.sp-net.at/wiki/doku.php?id=jornada_j720:memory_upgrade

And for the soldering process: try to practice on old SDRAM sticks. And use Flux!

Stefan

Edited by _dev-null 2020-12-02 10:28 AM
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