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[Bug 1777777] Re: arm9 clock pending (SP804)
From: |
RTOS Pharos |
Subject: |
[Bug 1777777] Re: arm9 clock pending (SP804) |
Date: |
Fri, 27 Sep 2019 06:01:07 -0000 |
Thank you for checking this issue.
I looked at the ptimer code, like you said. Just one question: isn't this used
by other hw as well?
Maybe this problem is more general...
I also tried (basically) the same example on a aarch64 (raspberry pi3),
and I don't find any problems there. Maybe could be helpful to look how
this problem is solved there.
Just trying to help
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https://bugs.launchpad.net/bugs/1777777
Title:
arm9 clock pending (SP804)
Status in QEMU:
Confirmed
Bug description:
Hello all,
I'm using the versatilepb board and the timer Interrupt Mask Status
register (offset 0x14 of the SP804) does not seem to be working
properly on the latest qemu-2.12. I tried on the 2.5 (i believe this
is the mainstream version that comes with Linux) and it works
perfectly.
What happens is that the pending bit does not seem to be set in some
scenarios. In my case, I see the timer value decreasing to 0 and then
being reset to the reload value and neither does the interrupt is
triggered nor the pending bit is set.
I believe this is a matter of timing since in the "long" run the
system eventually catches up (after a few microseconds).
Thank you
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