Sorry about the off-topic email. I sincerely felt that the people on this mailing list are the only ones who can help me.

About the problem itself: Yes, I am a little comfortable with the u-boot source code now, and I planned on using most of the code in cpu/mpc8260/start.S for making this 'micro monitor'

I definitely plan to make it available under the GPL, as I feel it will be a really good test tool for people bringing up their new hardware for the first time. They can use the processor to test crucial parts of the system, and use LEDs to report status. From my (limited) experience in board bring-up, everything right from the power supply to bad buffers, JTAG connections to bus noise are suspect when the board dosen't work. Atleast this tiny code will help clear up doubts from the processor's point of view. Developers will have one definite ally on the board who keeps sending status reports no matter what else is failing.

The only help I need is with gcc, or ppc_82xx-gcc, to be precise. I have no idea how to give it a single .S or .asm file and tell it to create a .bin. Makefiles? I only know how to use readymade ones, not to how to create one.

You said I will also need a .lds, and I don't know how to tell gcc to use that either.

Can anyone please send the complete process of compiling such a source (only 1 or two source files) along with the .lds and creating a .bin?

Waiting, Nishant

PS. Sorry again if its still off-topic. But I feel it can be a good addition to u-boot as a separate tool. This will also be independent of the board, and most people will simply have to change the addresses of the LEDs to get it working for their board.

-----Original Message----- From: wd@denx.de [mailto:wd@denx.de] Sent: Wednesday, January 26, 2005 3:05 PM To: Nishant Galange Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] really really tiny code

In message 1106684792.3804b95cnishant.subs@myrealbox.com you wrote:

I want to write a really tiny program - just init core, MMU and stop. Preferably, (if possible) I would like to start out with a blank file, type in the code, and give the compile command at the good old command prom= pt.

Is it possible? If yes, can anyone please tell me the command?

Yes, it is poossible. You will need more than one command, at least "vi" and "ppc_82xx-gcc".

Would any other files (.lds, etc) be necessary? What else will be required?

Yes, you will most probably need a linker script.

One of the most important requirements is an in-depth understanding of your hardware environment and how to write software for it.

I need a micro development environment like this from where I can do all my work out of the cosy little (really limited, I know) DPRAM, and try out some experiments with the processor's registers and config. I might even be adventurous and try initializing the ports and glowing some LEDs :-)

What do I do? How do I proceed? Please help.

U-Boot includes all the init stuff you will probably re-0invent, so feel free to copy and re-use this code (and make your program available under GPL), but please understand that you are on your own with such a project.

Sorry, but this is off topic here.

Best regards,

Wolfgang Denk