Are there any operations may influence WFI instruction?

Are there any operations may influence WFI instruction?

[jameszxj]

Hi,
  I run rtems6 on my imx6ull board, just initialize a GPT timer to flash a LED.  I load rtems with barebox, after output some initialized messages, system enters shell and stalls, interrupt(GPT timer, arch7 timer for tick) do not happen again. Shell (connect to UART1,interrupt mode) still works, when I type something, the LED flashes. It seems that system only responses to UART1 interrupt, and triggers the other interrupts respones. I remove wfi instruction from idle task, system runs ok.
And when I replace barebox with uboot, everything seems OK. I think maybe some initialized differences between barebox and uboot, but I haven't find any clues that  may influence WFI.


Any suggestion?
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Re: Are there any operations may influence WFI instruction?

[Ahmad Fatoum]

Hi,

On 01.05.21 15:20, jameszxj wrote:
> Hi,
>   I run rtems6 on my imx6ull board, just initialize a GPT timer to flash a LED.

You can describe heartbeat LED in the barebox device tree just as you'd do in
Linux and barebox will take care to blink it during bootstrap. No need to involve
interrupts.

> I load rtems with barebox, after output some initialized messages, system enters shell and stalls, interrupt(GPT timer, arch7 timer for tick) do not happen again. Shell (connect to UART1,interrupt mode) still works, when I type something, the LED flashes. It seems that system only responses to UART1 interrupt, and triggers the other interrupts respones. I remove wfi instruction from idle task, system runs ok.
> And when I replace barebox with uboot, everything seems OK. I think maybe some initialized differences between barebox and uboot, but I haven't find any clues that  may influence WFI.

barebox on i.MX uses one of the available GPT timers as clocksource.

HTH,
Ahmad

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