Disable MMU

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Disable MMU

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1405872605
Contributor I

Hi, everyone, recently I tried to change physical memory address's value on my i.MX 28 EVK(with OpenWrt operating system) but kept failing.

I found that their is a "MMU" in arm926ej-s so that value were not actually write into the physical memory, so I want to disable it. According to ARM offical DOC:"To disable the MMU, clear bit 0 in CP15 c1." 

I use OpenOCD and run "arm mrc 0 0 0 0",but only get a strange number and MMU didn't disable.

Any advisory can be given?

Thanks.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Jack

for examples with disabled mmu one can look at i.MX28 OBDS baremetal tests

On-Board Diagnostic Suit for the i.MX28

Best regards
igor
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