[U-Boot-Users] Questions about the U-Boot README, esp. CFG_IMMR
Wolfgang Denk
wd at denx.de
Wed Dec 8 13:12:56 CET 2004
In message <41B6EC48.8050909 at web.de> you wrote:
>
> About CFG_IMMR the README says: DO NOT CHANGE! (MPC8xx systems only)
This is a bit of strong language to scare off thos who don't
unterstand what they are doing.
> This confuses me. As the IMMR is a SPR (special purpose register) in the
> MPC8xx, assigning it an address seems to make no sense.
Read this as: special register which holds the address of the
Internem Memory.
> Nevertheless CFG_IMMR is used everywhere in the U-Boot code, so there
> must be a preset for it, which I can't find in the source. Also, almost
RTFM - the 'M' is the MPC8xx User's Manual here.
> any config in include/configs sets this to 0xFF000000.
> So what is it good for and what should I choose?
This depends on the memory map you chose for your board. Remember:
it's _you_ who defines the memory map.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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