Date: Wed, 19 Aug 2020 10:13:23 +0200 From: Johnny Sorocil <jsorocil@gmail.com> To: freebsd-arm@freebsd.org Subject: Disabling internal RTC ends up in hang Message-ID: <CADxA8Sr%2Bmkx1GvgabFWOCaN3nURy=LoOH9VM9DduynWbW%2Bo_Mg@mail.gmail.com> In-Reply-To: <CADxA8Sq6TrjDBW0PH_HoywrKDjT=mKxH0F27XYLxDN=d=QHHyw@mail.gmail.com> References: <CADxA8Sq6TrjDBW0PH_HoywrKDjT=mKxH0F27XYLxDN=d=QHHyw@mail.gmail.com>
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I wan't to have the correct date on my ARM SBC (armv7 Orange Pi Zero board which doesn't have an RTC battery socket). Got an external I2C RTC module (DS3231) which is recognized and works (after adding device tree overlay): root@arm2:~ # sysctl dev.ds3231 dev.ds3231.0.32khz_enable: 1 dev.ds3231.0.sqw_mode: interrupt dev.ds3231.0.sqw_freq: 1024 dev.ds3231.0.bbsqw: 0 dev.ds3231.0.temp_conv: 0 dev.ds3231.0.temperature: 30.0C dev.ds3231.0.%parent: iicbus0 dev.ds3231.0.%pnpinfo: name=ds3231@68 compat=maxim,ds3231 dev.ds3231.0.%location: addr=0xd0 dev.ds3231.0.%driver: ds3231 dev.ds3231.0.%desc: Maxim DS3231 RTC dev.ds3231.%parent: Setting a date works - the system will have the correct date until power is disconnected. After power is connected again, system time is not read from RTC. After powercycle: root@arm2:~ # date Fri Jan 1 00:22:25 UTC 2010 root@arm2:~ # ./ds1307 -a 0x68 -r 09:37:59 12/08/2020 NTP is not used. ds1307 <https://raw.githubusercontent.com/vzaigrin/ds1307/master/DS1307.C>; program is used to directly read registers from the I2C module. Disabling internal rtc (via device tree overlay) results in kernel panic & hang: ---<<BOOT>>--- Copyright (c) 1992-2019 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 12.1-RELEASE r354233 GENERIC arm FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM 8.0.1) VT: init without driver. module_register: cannot register ofwbus/pcib from kernel; already loaded from kernel Module ofwbus/pcib failed to register: 17 module_register: cannot register simplebus/pcib from kernel; already loaded from kernel Module simplebus/pcib failed to register: 17 CPU: ARM Cortex-A7 r0p5 (ECO: 0x00000000) CPU Features: Multiprocessing, Thumb2, Security, Virtualization, Generic Timer, VMSAv7, PXN, LPAE, Coherent Walk Optional instructions: SDIV/UDIV, UMULL, SMULL, SIMD(ext) LoUU:2 LoC:3 LoUIS:2 Cache level 1: 32KB/64B 4-way data cache WB Read-Alloc Write-Alloc 32KB/32B 2-way instruction cache Read-Alloc Cache level 2: 512KB/64B 8-way unified cache WB Read-Alloc Write-Alloc real memory = 536289280 (511 MB) avail memory = 509890560 (486 MB) No PSCI/SMCCC call function found FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs random: unblocking device. random: entropy device external interface kbd0 at kbdmux0 ofwbus0: <Open Firmware Device Tree> ofw_clkbus0: <OFW clocks bus> on ofwbus0 clk_fixed0: <Fixed clock> on ofw_clkbus0 clk_fixed1: <Fixed clock> on ofw_clkbus0 simplebus0: <Flattened device tree simple bus> on ofwbus0 regfix0: <Fixed Regulator> on ofwbus0 regfix1: <Fixed Regulator> on ofwbus0 regfix2: <Fixed Regulator> on ofwbus0 regfix3: <Fixed Regulator> on ofwbus0 ccu_h3ng0: <Allwinner H3/H5 Clock Control Unit NG> mem 0x1c20000-0x1c203ff on simplebus0 ccu_h3ng0: Clock apb2 have unknown parent: osc32k ccu_h3ng0: Clock ahb1 have unknown parent: osc32k ccu_h3ng0: Clock cpux have unknown parent: osc32k panic: cannot finalize clkdom initialization cpuid = 0 time = 1 Uptime: 1s Automatic reboot in 15 seconds - press a key on the console to abort Rebooting... Reset: watchdog device has not been initialized Reset failed! The same happens with -CURRENT with custom kernel compiled without aw_rtc device: % cat usr/src/sys/arm/conf/MYKERNEL include GENERIC ident MYKERNEL nodevice aw_rtc # Allwinner On-chip RTC Device tree overlay for disabling internal RTC is not enabled and after connecting serial console and booting that kernel: ... simplebus0: <Flattened device tree simple bus> on ofwbus0 regfix0: <Fixed Regulator> on ofwbus0 regfix1: <Fixed Regulator> on ofwbus0 regfix2: <Fixed Regulator> on ofwbus0 regfix3: <Fixed Regulator> on ofwbus0 ccu_h3ng0: <Allwinner H3/H5 Clock Control Unit NG> mem 0x1c20000-0x1c203ff on simplebus0 ccu_h3ng0: Clock apb2 have unknown parent: osc32k ccu_h3ng0: Clock ahb1 have unknown parent: osc32k ccu_h3ng0: Clock cpux have unknown parent: osc32k panic: cannot finalize clkdom initialization cpuid = 0 time = 1 KDB: stack backtrace: db_trace_self() at db_trace_self pc = 0xc0578934 lr = 0xc0079eb0 (db_trace_self_wrapper+0x30) sp = 0xc0d14b98 fp = 0xc0d14cb0 db_trace_self_wrapper() at db_trace_self_wrapper+0x30 pc = 0xc0079eb0 lr = 0xc02bf54c (vpanic+0x174) sp = 0xc0d14cb8 fp = 0xc0d14cd8 r4 = 0x00000100 r5 = 0xc0a42b20 r6 = 0xc06a0af6 r7 = 0x00000000 vpanic() at vpanic+0x174 pc = 0xc02bf54c lr = 0xc02bf308 (doadump) sp = 0xc0d14ce0 fp = 0xc0d14ce4 r4 = 0x000008c0 r5 = 0xd02f9800 r6 = 0x00000071 r7 = 0xc0d14d18 r8 = 0xc0d14d08 r9 = 0x00000001 r10 = 0x00000000 doadump() at doadump pc = 0xc02bf308 lr = 0xc05be870 (aw_ccung_write_4) sp = 0xc0d14cec fp = 0xc0d14d50 r4 = 0x00000000 r5 = 0xc0d14ce4 r6 = 0xc02bf308 r10 = 0xc0d14cec aw_ccung_write_4() at aw_ccung_write_4 pc = 0xc05be870 lr = 0xc02fc1b8 (device_attach+0x50c) sp = 0xc0d14d58 fp = 0xc0d14da0 r4 = 0x00000000 r5 = 0xc0ae30a4 r6 = 0x80040001 r10 = 0x80000803 device_attach() at device_attach+0x50c pc = 0xc02fc1b8 lr = 0xc02fbc10 (device_probe_and_attach+0x8c) sp = 0xc0d14da8 fp = 0xc0d14dc0 r4 = 0xd00de400 r5 = 0xc2471f80 r6 = 0x5e4a6f28 r7 = 0x00000000 r8 = 0xc0a615a8 r9 = 0xc0a615ac r10 = 0xc0a4278c device_probe_and_attach() at device_probe_and_attach+0x8c pc = 0xc02fbc10 lr = 0xc02fdf5c (bus_generic_new_pass+0xb0) sp = 0xc0d14dc8 fp = 0xc0d14de0 r4 = 0xd00de400 r5 = 0xc0848ef8 r6 = 0xc088cba0 r10 = 0xc0a4278c bus_generic_new_pass() at bus_generic_new_pass+0xb0 pc = 0xc02fdf5c lr = 0xc02fdfa8 (bus_generic_new_pass+0xfc) sp = 0xc0d14de8 fp = 0xc0d14e00 r4 = 0xd00df980 r5 = 0xc0848ef8 r6 = 0xd00e0000 r7 = 0x00000000 r8 = 0xc0a615a8 r10 = 0xc0a4278c bus_generic_new_pass() at bus_generic_new_pass+0xfc pc = 0xc02fdfa8 lr = 0xc02fdfa8 (bus_generic_new_pass+0xfc) sp = 0xc0d14e08 fp = 0xc0d14e20 r4 = 0xd00dfc00 r5 = 0xc0848ef8 r6 = 0xd00e0000 r7 = 0x00000000 r8 = 0xc0a615a8 r10 = 0xc0a4278c bus_generic_new_pass() at bus_generic_new_pass+0xfc pc = 0xc02fdfa8 lr = 0xc02fdfa8 (bus_generic_new_pass+0xfc) sp = 0xc0d14e28 fp = 0xc0d14e40 r4 = 0xd00dfc80 r5 = 0xc0848ef8 r6 = 0xd00e0000 r7 = 0x00000000 r8 = 0xc0a615a8 r10 = 0xc0a4278c bus_generic_new_pass() at bus_generic_new_pass+0xfc pc = 0xc02fdfa8 lr = 0xc02f9490 (bus_set_pass+0x54) sp = 0xc0d14e48 fp = 0xc0d14e60 r4 = 0xd00e78a0 r5 = 0xc0848ef8 r6 = 0xd00e0000 r7 = 0xc0a615a8 r8 = 0x7fffffff r10 = 0xc0a4278c bus_set_pass() at bus_set_pass+0x54 pc = 0xc02f9490 lr = 0xc0255904 (mi_startup+0x2a4) sp = 0xc0d14e68 fp = 0xc0d14e90 r4 = 0xc08a48b4 r5 = 0xc0a42788 r6 = 0x00800001 r7 = 0x00000000 r8 = 0x03800000 r9 = 0xc0a42794 mi_startup() at mi_startup+0x2a4 pc = 0xc0255904 lr = 0xc00002c4 (_start+0x144) sp = 0xc0d14e98 fp = 0x00000000 r4 = 0xc00003f8 r5 = 0xc0b1c000 r6 = 0x00000000 r7 = 0x00c52078 r8 = 0xc0cdd000 r9 = 0x5af1e780 r10 = 0x00000000 _start() at _start+0x144 pc = 0xc00002c4 lr = 0xc00002c4 (_start+0x144) sp = 0xc0d14e98 fp = 0x00000000 KDB: enter: panic [ thread pid 0 tid 100000 ] Stopped at kdb_enter+0x58: ldrb r15, [r15, r15, ror r15]! It is possible to run at boot script which will fetch time from an external module and set system clock, but I am wondering if that can be done automatically (disabling internal rtc and using external)? Should it be possible to boot an ARM SBC without an internal RTC device?
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