On 11:19 Tue 17 Mar , Dirk Behme wrote: > Fix OMAP3 timer handling to 1ms tick and CONFIG_SYS_HZ to 1000. > Clean up macros and comments. > > Signed-off-by: Dirk Behme <dirk.be...@googlemail.com> > Signed-off-by: Manikandan Pillai <mani.pil...@ti.com> > --- > > Changes from Mani's original patch which is replaced by this [1]: > > * Don't remove overflow handling in get_timer_masked() > * Update omap3_zoom1.h, too. > * Clean up timer related comments and macros in config files > * Don't touch reset_timer_masked() > * Switch divider clock divider from 256 to 8 to be able to get 1000Hz > * Remove unused udelay_masked() > * Minor clean up of get_tbclk() > > [1] http://lists.denx.de/pipermail/u-boot/2009-March/049012.html > > This patch is against U-Boot mainline commit > 'b3dd629e78870ba2dc9f8032978721c0fa02a856' > 'Prepare 2009.03-rc2' > > cpu/arm_cortexa8/omap3/interrupts.c | 50 > +++++++++++------------------------- > include/configs/omap3_beagle.h | 11 +++---- > include/configs/omap3_evm.h | 15 +++++----- > include/configs/omap3_overo.h | 11 +++---- > include/configs/omap3_pandora.h | 11 +++---- > include/configs/omap3_zoom1.h | 11 +++---- > 6 files changed, 43 insertions(+), 66 deletions(-) > > Index: u-boot-main/cpu/arm_cortexa8/omap3/interrupts.c > =================================================================== > --- u-boot-main.orig/cpu/arm_cortexa8/omap3/interrupts.c > +++ u-boot-main/cpu/arm_cortexa8/omap3/interrupts.c > @@ -169,7 +169,16 @@ static ulong timestamp; > static ulong lastinc; > static gptimer_t *timer_base = (gptimer_t *)CONFIG_SYS_TIMERBASE; > > -/* nothing really to do with interrupts, just starts up a counter. */ > +/* > + * Nothing really to do with interrupts, just starts up a counter. > + * We run the counter with 13MHz, divided by 8, resulting in timer > + * frequency of 1.625MHz. With 32bit counter register, counter > + * overflows in ~44min > + */ It will be better to use the 12Mhz source clock and set the divider to 4 so you will a a timer frequency to 3MHz and a perfect Match clock it will overflow ealier but the timer will be exact
Best Regards, J. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot