Architectures and Processors forum Uboot Hang after sctlr_el3.M is set to 1

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Uboot Hang after sctlr_el3.M is set to 1

VishalChopra over 3 years ago

Hi Expert,

I have ARMv8 A65.

I'm enabling MMU from uboot. Uboot hang on setting sctlr_el3.M bit to 1.

So my question is Can i enable MMU with EL3?

if not when exactly i need to move to EL1 to enable MMU?

Thanks in advance

Regards,

Vishal

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Zhifei Yang over 3 years ago in reply to VishalChopra +1 suggested

Yes, you can enable MMU for EL1/EL2/EL3 independently. Please refer to this source code example about how we enable the MMU for different ELs. - https://git.trustedfirmware.org/TF-A/trusted-firmware...

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0 VishalChopra over 3 years ago in reply to Zhifei Yang

Hi Zhifei,

Thanks for the reply. This is very helpful.

I'm able to enable MMU in EL3.

Next Question:-

Is there any way to check MMU is enabled and working properly or not? (SCTLR_EL.M bit is 1 i verified any other way)

Regards,

Vishal
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0 VishalChopra over 3 years ago in reply to Zhifei Yang

Hi Zhifei,

Thanks for the reply. This is very helpful.

I'm able to enable MMU in EL3.

Next Question:-

Is there any way to check MMU is enabled and working properly or not? (SCTLR_EL.M bit is 1 i verified any other way)

Regards,

Vishal
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0 42Bastian Schick over 3 years ago in reply to VishalChopra

Provoke an exception (writing to un-mapped memory) .
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