Hello Arvid,
you don't need change start.s to boot from NOR. If shold set the #define CONFIG_SYS_TEXT_BASE 0x00000000
But that's just the thing, I *do* need this change for the board to boot. CONFIG_SYS_TEXT_BASE is 0x10000000 (this is the base address for the flash memory).
YES and NO: The nor is physical mapped to 0x1000000 that's right. But during boot from nor the Memory is also mapped to address 0x0. U-Boot is relocate to ram after ram init. The calculations of the reclocation process are based on "delta between PC and CONFIG_SYS_TEXT_BASE".
Without my patch above, I only get this:
U-Boot 2012.10 (Oct 09 2013 - 02:28:44)
DRAM: 64 MiB
So at this position u-boot try to jump to a wrong address or code in ram.
I thought this was a known problem with at91rm9200 booting from NOR flash? There's at least one other board that I know of with the same problem (the Artila Matrix-500).
Please see the configuration for eb_cpux9k2 board. This board does boot from NOR with u-boot 2012.10.
Hmm, you are right. This config does boot my card (after I modify it to suit, of course). Besides the different CONFIG_SYS_TEXT_BASE, I think the main differences to the at91rm9200ek config that I based my earlier config on are these things:
#define CONFIG_SYS_BOOT_SIZE 0x00 /* 0 KBytes */ #define CONFIG_SYS_U_BOOT_BASE PHYS_FLASH_1 #define CONFIG_SYS_U_BOOT_SIZE 0x60000 /* 384 KBytes */
None of these are declared in the at91rm9200ek config.
This are old items, which needs a clean up.
Regards Jens