Execution stops while enabling MMU

[Krassimir Slavchev]

Make sure that you are configured the RAM memory properly.
Also, can you give us more info about your board?

Björn König wrote:
> Hello,
>
> I try to use FreeBSD with an AT91RM9200-based board similar to KB920X. I
> use an existing boot loader (U-Boot running at 0x00000000) to copy the raw
> binary kernel (not ELF) to the beginning of the SDRAM (0x20000000) and
> execute it with the "go" command. But suddenly the execution stops while
> enabling the MMU in src/sys/arm/arm/locore.S:
>
>   /* Enable MMU */
>   mrc     p15, 0, r0, c1, c0, 0
>   orr     r0, r0, #CPU_CONTROL_MMU_ENABLE
>   mcr     p15, 0, r0, c1, c0, 0
>
> Code behind these lines won't be executed anymore. Here are some variables
> that I use:
>
> KERNPHYSADDR=0x20000000
> KERNVIRTADDR=0xc0000000
> PHYSADDR=0x20000000
> STARTUP_PAGETABLE_ADDR=0x20800000
>
> Does anybody have a hint for me? My knowledge about ARM architecture is
> still superficially (literature already ordered ;-).
>
> Regards
> Björn
>
>
>
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