Making small executables from arm-elf-gcc

Yes.

Make your own startup module and instruct the linker to ignore the default startup code. The bulk is coming in due to the startup modules crtbegin.o and crt0.o.

I'm using a module to create an ARM AIF header to the executable and do the necessary initialisation for the C runtime. It needs also a tailored linker script (which is needed for stand-alone code anyway).

BTW, you ought to get a compiler warning about uninitialised variable 'j'.

In my experience, -O2 produces code best suited for embedded use.

HTH

Tauno Voipio tauno voipio @ iki fi

Well, I wrote a book about it, does that help? ;) Seriously, email me privately and I'll dig into my backups and send you the code (Monday).

All the I/O is memory mapped. You just coerce a pointer into containing the correct address. The sample source I'll send you illustrates it simply.

There seems to be a social request for a very simple ARM board, e.g. an AT91R40008 with a single Flash chip (e.g. AM29DL163) , crystal, RS-232 buffers, reset chip and connectors for the PIO and JTAG pins.

I could provide a draft schematic, if somebody is interested to make the thing.

Tauno Voipio tauno voipio @ iki fi

I recommended the AT91EB40 in my book, for that specific reason. It was $179 at the time (it's now more expensive!). It has been superseded by the EB40A, which costs $198.00 at Digi-Key (cat #AT91EB40A-ND). Very reasonably priced kits, I highly recommend them.

Of course, it is almost trivial to make up a simple demo board for these cheap ARMs. Personally I'd like to make a little board with a Cirrus EP7312 or Sharp LH79520, a socket for a DIP flash chip, and a socket for a standard RAM DIMM, and everything else brought out to headers. The production cost of such an item would be about $100-$120 (in tiny quantity). But I never seem to find time to sit down and finalize such a project.

Oh, by the way: also look at , but it still doesn't appear to be shipping yet and there's no guarantee as to support/availability. So the EB40A is still a safer bet.

I've done a lot of PCB designs before, so I could make up the PCB design and everything, and then I could release it to whoever wants it and give them the names of a few reasonably priced PCB-manufacture companies.

Also, like one of the previous posters, I was looking to step way up from a Atmel AVR. I'm looking at the AT91s, but also there is a new chip coming out from TI, the TMS320F281x series. Pretty fast chip, for about $20 each. Problem is you have to pay for development tools, etc....

I searched on the Atmel website and found a few different AT91 eval boards like AT91EB42, AT91EB55, AT91EB63.

Does someone know the differences ? What are the prices of them ? Perhaps buying is cheaper than making it ourself (especially if you add to get all the parts, perhaps from different distributors ?).

Can someone point me to a (up-to-date) website, where i can download the arm-gcc ?

Greetings,

Martin

You can try mine, of course ;) My goal is to get in the top 25,000 selling SKUs on amazon, and I've got a long way to go yet (currently #70,711 - up a long way from where I started at 2,000,000th!). But at least I outsell bulk packs of Oberto beef jerky, and also such memorable tomes as "DB2 Universal Database for OS/390: An Introduction to DB2 for OS/390 Version 7" and "Squids Will Be Squids: Fresh Morals, Beastly Fables".

I have made the sourcecode for the book example projects available at

- this source is intended for the EB40 but should easily be adaptable to the 40A. I have NOT yet analyzed exactly what would need to be changed (I don't own an EB40A) so please don't ask :)

(I haven't linked this file on zws.com yet; I'll do that when I get time to write some decent text; patience!).

I bought an AT91EB55 and it was about $200 or maybe $250. You need to check with distribution or Atmel for pricing. This stuff can vary and they obsolete boards from time to time.

I believe different CPU chips. I know the AT91EB55 uses the AT91M55800A which has a lot of IO functions on chip.

Building your own board is a PITA. Some of the more commone boards like the EB40 are defacto standards with a lot of third party support like board support packages for OS, etc.

Try this link...

You will have to register. I normally use a yahoo account for this sort of thing.

--

Rick "rickman" Collins

rick.collins@XYarius.com
Ignore the reply address. To email me use the above address with the XY
removed.

Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design      URL http://www.arius.com
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Stupid! The URL is actually:

Sorry, all!

Dang -- might have to take a short trip at lunchtime tomorrow. Thanks for the pointer, looks like a good hack (in the original sense).

--
Rich Webb   Norfolk, VA

Hello,

S3C4510B

Great idea ! Can you give me the manufacturer and perhaps complete name of this part ? I am from Germany and want to try to get it in Germany.

Do someone know of equivalent things containing an ARM processor and flash memory ?

Greetings,

Martin (mailto:newsgroup snipped-for-privacy@clibb.de)

: Great idea ! Can you give me the manufacturer and perhaps complete name of : this part ? I am from Germany and want to try to get it in Germany.

: Do someone know of equivalent things containing an ARM processor : and flash memory ?

Item number 290331 Cable/DSL Broadband Router w/4 port 10/100Mbps Switch

Direct Link:

You can order it online with the link above.

-- Greg Holdren greg holdren com