How to disable MMU for arm64 platforms like imx8 series

[haamnath]

I tried to disable MMU before control gives to Linux kernel.

So the flow is,

U-boot Spl -> ATF -> U-boot -> Bootloader -> Payload -> Linux kernel

End of payload we give control to Linux kernel. Before giving control kernel we need to disable MMU.

I use the below code to disable MMU and the results, kernel gives warning and hang.

// Disable MMU

mrs x0, sctlr_el1 // Read the System Control Register (EL1)

and x0, x0, #1 // Clear the M (MMU enable) bit

msr sctlr_el1, x0 // Write back the modified value to SCTLR_EL1

isb

dsb sy

ret

Any suggestion on this ?

[Bio_TICFSL · Accepted solution]

Hello,

You can disable from kernel menu config or  variable CONFIG_MMU (default value y)in the Kconfig file.

Regards