Creating a configuration for my custom MPC875 board

Some days ago I was told on this mailinglist I needed to create a custom configuration in order to get linux running on my custom hardware.

So I did as I was told and created an own <name>_defconfig and entries in the menu via editing arch/ppc/config.in and so on.

Well, every board seems to include it's custom header file from platforms/<NAME>.h in the include/asm/mpc8xx.h header file. Now I'm curious if I also need to include something?

It seems there usually isn't much stuff in the <name>.h file, only an IMAP_ADDR define and the definition of struct bd_info.

Do I need this stuff - or how do I find out?

Best regards,

Peter Asemann

You'll definately need to find out what _your_ IMAP_ADDR is, that is something which is almost certainly going to be unique to your own PCB.

Aside from that depending on what bootloader you are using, you may or may not have to do things to enumerate a bd structure.

In the case of Redboot, you would probably have to take the board descriptor given by redboot and parse it, else, with u-boot, I think you have _less_ maintenance on that front.

Do you have a working bootloader for your board, something that will try to execute a *image ? If you do, then getting Linux booting should be relatively trivial.

Bod

Actually the location of the IMMR area i just a part of the system's memory map, which you just make up yourself - i. e. you can chose it pretty freely, and in many cases you just copy te mapping of some existing, similar board.

Of course you have to understand what you are doing, but this is always the case, isn't it?

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
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