Enable CSU in imx6

[kajalsabhani]

Hi all,

As per CSU_CSL registers default value ,it has secure read /write permission by default .(CSU_CSL=0x00330033)

I am not getting that even though it has secure read/write access permission then how that peripheral can be accessed from linux kernel.

is it that linux kernel is operating in secure mode?

i want to add CSU for secure and non secure access of peripherals .

so help me on how to enable CSU in imx6.

Thanks

[art]

Q. is it that linux kernel is operating in secure mode?

A. The Linux kernel code is executed in the ARM hardware Supervisor mode, so, it has the Secure level of access.

Q. i want to add CSU for secure and non secure access of peripherals . so help me on how to enable CSU in imx6.

A. Please refer to the Chapter 3 of the i.MX6 Series Security Reference Manual document, available for download on the NXP web site (check the "Reference Manuals" section):

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

Have a great day,
Artur

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[kajalsabhani]

As linux is in supervisor mode and has secured level of access then how i configure linux for user mode and non secure access

[art]

It is not possible to make the Linux kernel run in User mode.

[kajalsabhani]

Ok .

so using CSU we can provide non secure accesss .

for that SMC (secure monitor calling) is required . right?