Dear David Kaplan,

In message 62564a490910270526yf6e831bt869695b71a70c229@mail.gmail.com you wrote:

Yesterday I was a JTAG newbie - today I'm a u-boot newbie as well and I was wondering if anyone could help me out.

By extrapolation you will be a Linux newbie tomorrow, an apprentice in a week and an expert in a month from now. Or so.

I've managed to get my hands on a surplus gps board (have no idea what gps).

Isn't there _any_ name or type code on that board?

The board has a samsung s3c2410 chip (arm9), samsung k9f5608u0d 32M flash mem and two Qimonda HYB25L256160AF-7.5 (SDRAM) chips (16Mbit x 16 organisation I think).

My JTAG interface works fine and I can communicate with the chip (I have managed to dump the flash too - i think).

Then try to find out what's in the flash. Use hexdump and "strings -a" etc. - with any luck, there was U-Boot and Linux running on that box, and you can ask the manufacturer for the source code.

I would like to know where to begin in regards to building a u-boot config for this setup. Is there a ready-made config I could use (or edit?) Or some documentation on how to build a config from first principles?

There is a porting guide in the README. Not joking.

But keep in ming that an essential prerequisite for performing a port in a somewhat efficient manner is a thorough understanding of both the processor architecture and the board design. Normally you will need schematics for the board (unless you are lucky in such as the board was derived from some well-known evaluation kit, and you manange to guess from which one - and manage to get the documentation for this).

Also, once the u-boot has been compiled - where do I flash it to? (which location in the flash mem - apparently it's not a good idea to overwrite the first 4k???)

We cannot tell you. You must know the design of this board, with all these little details, probably including many more things - like how to set (and eventually enable) clocks and outputs, how to power on and/or reset and/or initialize the peripherals on your boards, etc. You need detailed hardware documentation. And experience.

Alternatively, you need a LOT of time (after which you eventually may have gathered some experience).

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de No problem is insoluble. -- Dr. Janet Wallace, "The Deadly Years", stardate 3479.4