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How to Put IMX6 solo in WFI mode in uboot.

Question asked by Mohamed Thalib Haja on Apr 4, 2016
Latest reply on Apr 6, 2016 by Mohamed Thalib Haja

How to Put IMX6 solo in WFI mode in uboot.


I am trying to put the IMX6 solo processor in WFI interrupt mode, when there is not operation.

But when a button is pressed it should exit for WFI mode.


I have created a command wfi which executes wfi asm instruction.



int do_wfi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
    printf("Entering WFI mode\n");
    __asm__ volatile("wfi");
    printf("Exiting WFI mode\n");

    return 0;

From command mode I am setting the registers to configure the interrupt.


For configuring GPIO as interrupt


mw.l 0x20AC010 0x100000 1


mw.l 0x20AC014 0x100000 1


mw.l 0x20AC018 0xFFFFFFFF 1


Set the mask on GIC


mw.l 0x20DC010 0x800 1


Then run the command wfi on uboot command line, the processor appears to enter wfi mode , but not waking up from wif mode when the button is pressed.


Am I missing any steps or is there any mistake. Please help