Bug 212185 - The aarch64 EFI kernel does not get/set the EFI clock
Summary: The aarch64 EFI kernel does not get/set the EFI clock
Status: Closed FIXED
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 11.0-RC1
Hardware: arm64 Any
: --- Affects Many People
Assignee: Andrew Turner
: 212184 220048 (view as bug list)
Depends on:
Blocks: 203349
  Show dependency treegraph
Reported: 2016-08-26 20:56 UTC by Peter Wemm
Modified: 2017-11-21 17:34 UTC (History)
3 users (show)

See Also:


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Description Peter Wemm freebsd_committer freebsd_triage 2016-08-26 20:56:53 UTC
If you boot an aarch64 machine on real hardware, you are greeted with:
warning: no time-of-day clock registered, system time will not be set accurately

After reading the code, it appears that the EFI runtime services get/set clock calls are not used.

For reference, there is an implementation in the stable/10/sys/ia64/ia64/efi.c although it is a little strange in that it attaches to the ia64 nexus driver.  See efi_get_time() / efi_set_time() and the nexus clock driver.

The impact of this is that aarch64 machines boot up on Jan 1st, 1970 and are unable to do dnssec validation.  This affects ntp.conf if you have dns names in there.
Comment 1 Ed Maste freebsd_committer 2016-08-26 21:03:47 UTC
*** Bug 212184 has been marked as a duplicate of this bug. ***
Comment 2 Andrew Turner freebsd_committer 2016-08-26 23:26:57 UTC
Warner has patches to start supporting the runtime services, but these would need testing on arm64.
Comment 3 Ed Maste freebsd_committer 2017-06-16 14:32:07 UTC
See r212185
Comment 4 Ed Maste freebsd_committer 2017-06-16 14:40:20 UTC
*** Bug 220048 has been marked as a duplicate of this bug. ***
Comment 5 Andrew Turner freebsd_committer 2017-10-13 09:59:47 UTC
There is a patch in review D12650. This depends on base r324495.
Comment 6 Ed Maste freebsd_committer 2017-11-21 02:10:46 UTC
Patch (w/ additional fix) tested on my SoftIron OverDrive 1000.
Comment 7 commit-hook freebsd_committer 2017-11-21 17:23:44 UTC
A commit references this bug:

Author: andrew
Date: Tue Nov 21 17:23:16 UTC 2017
New revision: 326066
URL: https://svnweb.freebsd.org/changeset/base/326066

  Add a driver for the EFI RTC. This uses the EFI Runtime Services to query
  the system time.

  As we seem to only read this time on boot, and this is the only source of
  time on many arm64 machines we need to enable this by default there. As
  this is not always the case with U-Boot firmware, or when we have been
  booted from a non-UEFI environment we only enable the device driver when
  the Runtime Services are present and reading the time doesn't result in an

  PR:		212185
  Reviewed by:	imp, kib
  Tested by:	emaste
  Relnotes:	yes
  Sponsored by:	DARPA, AFRL
  Differential Revision:	https://reviews.freebsd.org/D12650

Comment 8 Andrew Turner freebsd_committer 2017-11-21 17:34:05 UTC
This can't be MFCd as it relies on other changes that would break KBI of struct pcb.