Hello Michael We have encountered the same warnings with the Atmel SAMA5D35 processor when using the RT_PREEMPT patch. We get the same warnings with both 3.6.9-rt21 and 3.10.9-rt5 kernels. However, the 3.6.9-rt21 kernel boots just fine, and we also had problems booting the 3.10.9-rt5 kernel. Therefore these warnings and boot hanging might be unrelated. What's causing these warnings is still unknown, but at least we got the 3.10.9-rt5 kernel to boot. The boot problem seems to be caused by the TCB clock source (tcb_clksrc). You could try to unset the CONFIG_ATMEL_TCB_CLKSRC option, but this is not optimal configuration for rt. I have attached a patch which goes on top of the rt5 patch that seems to fix the boot hang issue. Could you please report the results if you have time to test this patch? Please note that I have not yet done any rt-tests with this patch. BR, Sami Pietikäinen Software Developer Wapice Ltd. --- a/drivers/clocksource/tcb_clksrc.c 2013-08-29 16:14:14.611335823 +0300 +++ b/drivers/clocksource/tcb_clksrc.c 2013-08-29 16:16:28.129657272 +0300 @@ -192,9 +192,13 @@ clkevt.clk = t2_clk; tc_irqaction.dev_id = &clkevt; - timer_clock = clk32k_divisor_idx; + timer_clock = divisor_idx; - clkevt.clkevt.cpumask = cpumask_of(0); + if (!divisor) + clkevt.freq = 32768; + else + clkevt.freq = clk_get_rate(t2_clk)/divisor; + clkevt.clkevt.cpumask = cpumask_of(0); clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff); -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
