Hi !
We are observing that we get 2-3 interrupts every second on an AM3358 custom board configured for 1 sec periodic timer interrupt when operated at > 300 MHz.
The 1 sec periodic timer interrupt works good when operated at 300MHz.
The original kernel driver did not support the Interrupts from the internal RTC, but we modified the driver (rtc-omap.c, interface.c, rtc-dev.c) to configure the 1sec periodic interrupt (Register 0x48). We are toggling a GPIO when the 1sec interrupt occurs and we observed on O-scope that at 300Mhz we get only 1 interrupt but when we change the frequency to more than 300 MHz we observe 2-3 interrupts a second.
Clock Source: We are setting the 6th bit and clearing the 4th bit in the RTC_OSC_REG(0x54) to use the rtc_32k_clk_rtc_32k_aux_clk clock.
Kernel: Linux-3.12.10-rt15
Harsha Kiran KJ |