There is suspicion that the 32kHz input clock to the OMAP may be noisy on BeagleBoards. On OMAP2/3 GPTIMER1, this can cause the timer counter register to warp to unknown values or miss interrupt conditions. So, use GPTIMER12 instead, which apparently has its own secure 32kHz oscillator and will hopefully not be prone to the suspected sys_32k glitches.
This is only a workaround. If sys_32k is noisy, other system peripherals may be affected. This workaround is a collective product of several people, most notably Philip Balister <[EMAIL PROTECTED]>, Dirk Behme <[EMAIL PROTECTED]>, Koen Kooi <[EMAIL PROTECTED]>, Tony Lindgren <[EMAIL PROTECTED]>, Steve Sakoman <[EMAIL PROTECTED]>, Khasim Syed Mohammed <[EMAIL PROTECTED]> Richard Woodruff <[EMAIL PROTECTED]>. I apologize if there is anyone whom I've missed. Signed-off-by: Paul Walmsley <[EMAIL PROTECTED]> Cc: Khasim Syed Mohammed <[EMAIL PROTECTED]> Cc: Koen Kooi <[EMAIL PROTECTED]> Cc: Steve Sakoman <[EMAIL PROTECTED]> Cc: Richard Woodruff <[EMAIL PROTECTED]> Cc: Tony Lindgren <[EMAIL PROTECTED]> Cc: Philip Balister <[EMAIL PROTECTED]> Cc: Dirk Behme <[EMAIL PROTECTED]> --- arch/arm/configs/omap3_beagle_defconfig | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/configs/omap3_beagle_defconfig b/arch/arm/configs/omap3_beagle_defconfig index e1b16d0..7805995 100644 --- a/arch/arm/configs/omap3_beagle_defconfig +++ b/arch/arm/configs/omap3_beagle_defconfig @@ -182,8 +182,8 @@ CONFIG_OMAP_BOOT_REASON=y # CONFIG_OMAP_MCBSP is not set # CONFIG_OMAP_MMU_FWK is not set # CONFIG_OMAP_MBOX_FWK is not set -CONFIG_OMAP_MPU_TIMER=y -# CONFIG_OMAP_32K_TIMER is not set +# CONFIG_OMAP_MPU_TIMER is not set +CONFIG_OMAP_32K_TIMER=y CONFIG_OMAP_DM_TIMER=y # CONFIG_OMAP_LL_DEBUG_UART1 is not set # CONFIG_OMAP_LL_DEBUG_UART2 is not set @@ -198,6 +198,7 @@ CONFIG_ARCH_OMAP3430=y # CONFIG_MACH_OMAP_3430SDP is not set # CONFIG_MACH_OMAP3EVM is not set CONFIG_MACH_OMAP3_BEAGLE=y +CONFIG_OMAP_TICK_GPTIMER=12 # # Boot options -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
