Re: [Qemu-devel] [PATCH 03/14] timer: ds1338 persist 12-hour mode selection

[Michael Davidsaver]

On 07/05/2018 09:35 PM, Michael Davidsaver wrote:
> Also, I though I had test coverage of this bug.  That's actually how I
> noticed it to begin with.  But it seems my later change to allow for a
> slow test runner also stopped testing readback of the 12/24 hour mode bit.
> It just silently uses whichever it reads.  I'll be re-issuing an updated
> version which restores this check.  Then you will be able to easily
> see the effect of reverting 'timer: ds1338 persist 12-hour mode selection'.

I've posted revised versions of two of the three test patches #6 and #7
(which I've hopefully posted correctly...).  #6 again tests for this issue.
So you can demonstrate the problem by either applying 1,2,4-6, or just 1 and 6
to see that the issue is present in the original implementation.

The test failure should be:

> test_rtc_set: assertion failed (mode_expect == mode_actual): (1 == 0)

Which shows that a write with 12 hour mode is read back as 24 hour mode.

Similarly, omitting patch #5 will cause the tests added in #7 to fail.

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