Re: [Ppcboot-users] Question about IMMR

[Wolfgang D. <wd...@de...>]

Hi,

> Can someone tell me why all documentation suggests use of address 0x0470000

You must be reading the wrong documentation. I think I remember there
aresome clear words in the Embedded PPC HOWTO, but I don't have access
at the moment.

> for IMMR? This is in BDI2000 example, Motorola ADS8260 board documentation
> and in the 8260 based card we have.

It's inherited from the "reference" design of the (F)ADS.

> I understand that this is just a convention, but where did it came from?

No, it's a bad joke, and will break miserably under Linux.

> When MPC8260 loads its HRCW it can not set IMMR to 0x04700000. It has to be
> done manually after booting. Why go to the trouble and remap it if hardware
> architecture allows for it to sit in one of 8 standard locations specified
> in HRCW (ISB)?

Maybe Mot doesn't understand how to prograsm their own chips? Or build
systems with it? At least the FADS designs supports thyat speculation...


Best regards,

Wolfgang Denk