[ECOS] Init sequence for enabling MMU at mpc5xx fails

Gary Thomas gary@mlbassoc.com
Tue Jul 22 15:46:00 GMT 2008


Andrey Baboshin wrote:
> Hi, all.
> 
> I find following problem.
> I enable the MMU in eCos and it executes next code
> 
>         # Initialize MMU.
>         bl      hal_MMU_init
> 
>         # Enable MMU (if desired) so we can safely enable caches.
>         lwi     r3,CYG_MSR              # interrupts enabled later
>         sync
>         mtmsr   r3 (*)
>         sync
> 
>         # Enable caches
>         bl      hal_enable_caches
> 
> I have found it fails after (*).
> In additional
> CYG_MSR = (CYG_MSR_COMMON | IP_BIT | IR_DR_BITS)
> CYG_MSR_COMMON = (MSR_FP | MSR_ME | MSR_RI)
> IP_BIT = 0
> IR_DR_BITS = (MSR_IR | MSR_DR)
> 
> Do have anyone some problem?
> It works only when I comment mtmsr r3 and followed by it sync.

Which only means that it works with the MMU turned off :-(

How did you setup the MMU?
What target/platform are you working with?

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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