Hi, Le 01/03/2016 06:00, Alexandre Belloni a écrit : > I also have that branch for preempt-rt on at91: > > https://github.com/alexandrebelloni/linux/tree/at91-rt I've not been able to apply the 13 patches on 4.4.3-rt9 due to conflicts, and then kernel would not compile. So I tried your at91-rt branch, Alexandre, and I'm pleased to report that it works! I'm just getting this warning: at91_i2c f8014000.i2c: using dma1chan0 (tx) and dma1chan1 (rx) for DMA transfers at91_i2c f8014000.i2c: AT91 i2c bus driver (hw version: 0x402). clocksource: Switched to clocksource tcb_clksrc ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at kernel/locking/rtmutex.c:2008 rt_mutex_trylock+0x28/0xec() Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.1-rt5 #1 Hardware name: Atmel AT91SAM9 [<c000ecf4>] (unwind_backtrace) from [<c000cf18>] (show_stack+0x10/0x14) [<c000cf18>] (show_stack) from [<c0016720>] (warn_slowpath_common+0x80/0xa8) [<c0016720>] (warn_slowpath_common) from [<c00167d8>] (warn_slowpath_null+0x18/0x20) [<c00167d8>] (warn_slowpath_null) from [<c03b0574>] (rt_mutex_trylock+0x28/0xec) [<c03b0574>] (rt_mutex_trylock) from [<c03b1a08>] (rt_spin_trylock_irqsave+0x10/0x1) [<c03b1a08>] (rt_spin_trylock_irqsave) from [<c0317524>] (clk_enable_lock+0x10/0xe4) [<c0317524>] (clk_enable_lock) from [<c03188e8>] (clk_disable+0x1c/0x34) [<c03188e8>] (clk_disable) from [<c0304d74>] (tc_shutdown+0x2c/0x3c) [<c0304d74>] (tc_shutdown) from [<c0304da4>] (tc_set_oneshot+0x20/0x50) [<c0304da4>] (tc_set_oneshot) from [<c0058d98>] (clockevents_switch_state+0x8c/0x12) [<c0058d98>] (clockevents_switch_state) from [<c0059cbc>] (tick_switch_to_oneshot+0) [<c0059cbc>] (tick_switch_to_oneshot) from [<c004e220>] (hrtimer_run_queues+0x34/0x) [<c004e220>] (hrtimer_run_queues) from [<c004cde8>] (run_local_timers+0x8/0x14) [<c004cde8>] (run_local_timers) from [<c004ce20>] (update_process_times+0x2c/0x5c) [<c004ce20>] (update_process_times) from [<c0059480>] (tick_handle_periodic+0x10/0x) [<c0059480>] (tick_handle_periodic) from [<c0304e60>] (ch2_irq+0x20/0x28) [<c0304e60>] (ch2_irq) from [<c003ff78>] (handle_irq_event_percpu+0x40/0x138) [<c003ff78>] (handle_irq_event_percpu) from [<c00400d8>] (handle_irq_event+0x68/0x9) [<c00400d8>] (handle_irq_event) from [<c0042ff4>] (handle_fasteoi_irq+0xa8/0x1a4) [<c0042ff4>] (handle_fasteoi_irq) from [<c003f820>] (generic_handle_irq+0x18/0x28) [<c003f820>] (generic_handle_irq) from [<c003fa68>] (__handle_domain_irq+0x7c/0xa0) [<c003fa68>] (__handle_domain_irq) from [<c000d8f0>] (__irq_svc+0x50/0x98) [<c000d8f0>] (__irq_svc) from [<c000f0dc>] (printascii+0x2c/0x58) [<c000f0dc>] (printascii) from [<c000f178>] (early_console_write+0x30/0x214) [<c000f178>] (early_console_write) from [<c003ca2c>] (call_console_drivers.constpro) [<c003ca2c>] (call_console_drivers.constprop.13) from [<c003e608>] (console_unlock+) [<c003e608>] (console_unlock) from [<c003ec64>] (vprintk_emit+0x448/0x484) [<c003ec64>] (vprintk_emit) from [<c003edb4>] (vprintk_default+0x1c/0x24) [<c003edb4>] (vprintk_default) from [<c006987c>] (printk+0x6c/0x80) [<c006987c>] (printk) from [<c0055b88>] (__clocksource_select+0x12c/0x14c) [<c0055b88>] (__clocksource_select) from [<c051038c>] (clocksource_done_booting+0x2) [<c051038c>] (clocksource_done_booting) from [<c00097a0>] (do_one_initcall+0x104/0x) [<c00097a0>] (do_one_initcall) from [<c0509d0c>] (kernel_init_freeable+0xfc/0x1c0) [<c0509d0c>] (kernel_init_freeable) from [<c03ae1c4>] (kernel_init+0x8/0xe4) [<c03ae1c4>] (kernel_init) from [<c000a378>] (ret_from_fork+0x14/0x3c) ---[ end trace 0000000000000001 ]--- But the arietta seems to run fine. I'm getting about 100 - 250 µs latencies on a simple GPIO test. Thanks, -- Jean-Denis Girard SysNux Systèmes Linux en Polynésie française http://www.sysnux.pf/ Tél: +689 40.50.10.40 / GSM: +689 87.79.75.27 -- 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
