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troglobit opened this issue Nov 1, 2024 · 0 comments · Fixed by #796
Closed

Handle broken RTC #794

troglobit opened this issue Nov 1, 2024 · 0 comments · Fixed by #796
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enhancement New feature or request
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Infix v24.10.2

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@troglobit
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Infix needs to handle platforms with broken RTC better. "Broken" in this case means a non-battery backed RTC that at power-on start up with a completely random time in the future, which leads to skipping back in time when the NTP client synchronizes the system clock.

  • On platforms where cold start can be detected, and have this problem, we should clear the RTC
  • On platforms where cold start cannot be detected, we should disable the RTC
    • Disable the driver, or
    • Disable the node in the device tree
  • When the system starts, detecting a missing /dev/rtc (and others) should restore from a file instead
  • Periodically (every 11 mins, like the kernel) save system time to a file

The latter two can be handled by extending the RTC plugin in Finit, see troglobit/finit#418
@troglobit troglobit added the enhancement New feature or request label Nov 1, 2024
@troglobit troglobit added this to the Infix v24.10.2 milestone Nov 1, 2024
@troglobit troglobit self-assigned this Nov 1, 2024
@troglobit troglobit moved this to In progress in Infix & C:o Nov 1, 2024
@troglobit troglobit mentioned this issue Nov 3, 2024
Merged
troglobit added a commit that referenced this issue Nov 3, 2024
@troglobit
package/finit: backport upstream v4.9-pre patches
f8f1b91 
Backport support for saving and restoring system time from a file on
systems with broken RTC that reset to the future.

With this support a system can be sure time only ever moves forward.

Fix #794

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
@troglobit troglobit linked a pull request Nov 3, 2024 that will close this issue
Support for save/restore system clock from file #796
Merged
17 tasks
troglobit added a commit that referenced this issue Nov 3, 2024
@troglobit
package/finit: backport upstream v4.9-pre patches
0612f48 
Backport support for saving and restoring system time from a file on
systems with broken RTC that reset to the future.

With this support a system can be sure time only ever moves forward.

Fix #794

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
troglobit added a commit that referenced this issue Nov 4, 2024
@troglobit
package/finit: backport upstream v4.9-pre patches
d7031ac 
Backport support for saving and restoring system time from a file on
systems with broken RTC that reset to the future.

With this support a system can be sure time only ever moves forward.

Fix #794

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
@github-project-automation github-project-automation bot moved this from In progress to Done in Infix & C:o Nov 5, 2024
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enhancement New feature or request
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Infix & C:o
Status: Done
Milestone
Infix v24.10.2
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Support for save/restore system clock from file kernelkit/infix
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