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ARMv8 EL1 MMU

Hi,

    I am working on bootloader porting to ARM v8 platform. I am facing a problem in enabling MMU in execution level-1 EL1.

I am not able to set sctlr_el1.M bit when ever i try to set this bit the instruction won't complete. I think it is raising an exception where as i have not enabled the interrupts to capture. apart form sctlr_el1.M

bit i am able to set all other bits like sctlr.C, sctlr_el1.I.  Can some one please help regarding this issue? thanks in advance.