Re: Disabling internal RTC ends up in hang
Johnny Sorocil <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.arm |
|---|---|
| Message-ID | <CADxA8SpD9qZEL=4GN=opcztjRN3NWSV+3bqxkhvG3fp0WwuHfg@mail.gmail.com> |
On Wed, Aug 19, 2020 at 7:55 PM Ian Lepore <[email protected]> wrote: > I think you may be running into a problem Andriy (avg@) described on > irc the other day: the allwinner RTC hardware has no way to detect > whether it lost power, so it always supplies the time, even if it's > incorrect. When there are multiple RTCs in the system, the kernel asks > them in the order they registered until one provides the time. > > I suspect the panic is happening because the internal RTC also provides > the system 32khz clock, which is needed by other devices. > > He cooked up this patch: http://paste.ubuntu.com/p/6hhtQbJC85/ > > With that patch in place, the 32khz clock would be available, but the > RTC would not supply the time unless it was correct. > Attempt #1: Booting GENERIC kernel and loading patched "aw_rtc.ko" - already present in kernel - system date not correct Attempt #2: Booting custom kernel with option "nodevice aw_rtc" and loading patched "aw_rtc.ko" - same panic & hang as in previous message Attempt #3: Booting GENERIC kernel which has builtin patched "aw_rtc": mmc0: No compatible cards found on bus aw_mmc1: Spurious interrupt - no active request, rint: 0x00000004 mmc1: <MMC/SD bus> on aw_mmc0 Cannot set frequency for clk: mmc0, error: 34 aw_mmc0: failed to set frequency to 50000000 Hz: 34 uhub2: 1 port with 1 removable, self powered uhub0: 1 port with 1 removable, self powered ugen2.2: <Realtek 802.11n NIC> at usbus2 mountroot: waiting for device /dev/ufs/rootfs... Mounting from ufs:/dev/ufs/rootfs failed with error 19. Loader variables: vfs.root.mountfrom=ufs:/dev/ufs/rootfs vfs.root.mountfrom.options=rw Manual root filesystem specification: <fstype>:<device> [options] Mount <device> using filesystem <fstype> and with the specified (optional) option list. eg. ufs:/dev/da0s1a zfs:zroot/ROOT/default cd9660:/dev/cd0 ro (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /) ? List valid disk boot devices . Yield 1 second (for background tasks) <empty line> Abort manual input mountroot> aw_mmc0: controller timeout aw_mmc0: timeout resetting DMA/FIFO aw_mmc0: timeout updating clock aw_mmc0: controller timeout aw_mmc0: timeout resetting DMA/FIFO aw_mmc0: timeout updating clock aw_mmc0: controller timeout aw_mmc0: timeout resetting DMA/FIFO _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-arm To unsubscribe, send any mail to "[email protected]"