"Patrick .." oc3an@gmx.net schreibt:
I applied your patches to the 1.1.3 version of U-Boot - they all apply fine except for the main csb637 patch, which complains about patching a Makefile and MAKEALL.
Hi, that's probably due to other boards having been added in the meantime.
This is not the main problem however,
In the AT91RM9200 initialisation code, PMC_MCKR is written incorrectly. This register *MUST* be written in two separate steps (see the errata sheet for the AT91RM9200 for more details).
You're referring to Errata #28, right? Reading the text it seems you're right; however, this is not special to the CSB637 board - the code in question (cpu/arm920t/at91rm9200/lowlevel_init.S) was _not_ touched by my patch.
In my case i write 0x201, followed by 0x202.
OK, please provide a patch to lowlevel_init.S then.
Also, it is safe to use a divisor of 3 for the Master Clock, this gives 61.44MHz from a core of 184.32Mhz which is fine for the CSB637 (master clock limit is 80MHz), users should see a decent improvement in performance by doing this as it will increase the SDRAM bandwidth by a substantial amount.
Well, I got the clock values from linux 2.6.12 board-csb637.c; does Linux still boot correctly with your change?
Cheers Anders
CC'ed to the list, since this is relevant to ALL at91rm9200 users