Could you share to me the method how to boot a uboot at EL1 mode not EL2 mode ?

[dongjoo99kim]

Dear all.

I have developed imx8mq including cortex a53, gicv3 controller.

As i know, uboot can boot at EL2 mode by bl31 bootloader.

If my understand is not correct, Please. correct me.

I have a problem to enable gicv3 interrupt init, interrupt trigger, interrupt handler at uboot ( EL2 mode ) 

So, I try to change a uboot from EL2 mode to EL1 mode as like kernel using bl31 bootloader.

After changing the uboot to EL1 mode as like kernel using bl31 bootloader,

I want to enable gicv3 interrupt init, interrupt trigger, interrupt handler at uboot ( EL1 mode ).

If my idea have a problem,

Please, correct me.

And, Please share to me the method how to change uboot to EL1 mode by bl31 bootloader.

Thanks.

[joanxie]

pls refer to the link as below:

"https://github.com/ARM-software/arm-trusted-firmware/blob/master/bl1/aarch64/bl1_arch_setup.c"

“https://gitlab.com/bztsrc/bootboot/-/blob/master/aarch64-rpi/boot.S#L43”