Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

mpfgregory — Mon, 03 Aug 2015 15:09:25 GMT

I have a PIT running every millisecond on my Cortex-M4. This works fine while a Linux with kernel 3.0 is running on the A5. However, after switching to kernel 3.13 the PIT interrupt on the M4 is not triggered anymore.

When I enable the PIT in Linux(

System Type-> Freescale i.MX family-> Freescale i.MX support->Vybrid Family VF610 support->Clocksource for scheduler clock (Use PIT timer)

) the interrupt is also triggered on the M4, but Linux crashes regularly. The shell simply doesn't react anymore. I guess it doesn't like that the scheduler clock is used by someone else.

How can I prevent Linux from disabling interrupts that it doesn't use? Linux should only touch the registers of the interrupts it uses and leave all other vectors to the M4.

Re: Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

karina_valencia — Mon, 03 Aug 2015 17:19:07 GMT

timesyssupport can you help with this case?

Re: Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

mpfgregory — Wed, 05 Aug 2015 10:09:37 GMT

I have exchanged the hwtimer driver in the MQX 4.0.1 BSP with the one from the MQX 4.1 BSP. Now it works with the 3.13 kernel.

Vybrid ProcessorsのトピックRe: Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

Re: Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052

Re: Linux kernel 3.13 blocks PIT interrupt on M4 on PCM052