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From: nicholasbishop@gmail.com
To: devel@edk2.groups.io
Subject: Bug report: serial timeout gets overwritten shortly after setting it
Date: Sun, 21 Nov 2021 09:52:28 -0800	[thread overview]
Message-ID: <K9Zs.1637517148982010459.MRDO@groups.io> (raw)

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Hi, I have a bug to report with the serial I/O protocol. Using the SetAttributes function to change the timeout initially works, but after a short amount of time the timeout gets reset to 173 microseconds.

I believe this is likely due to the implementation of the simple text input protocol, which alters the serial timeout:
https://github.com/tianocore/edk2/blob/e1e7306b54147e65cb7347b060e94f336d4a82d2/MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c#L549

I've created a full example here:
https://github.com/nicholasbishop/edk2/commit/d6087f863a48f3c7812f47ea21d5d673adb8d754

The example sets the timeout to 1s which works correctly, then sleeps for 1s and reads the timeout value again. The timeout is now 173ms.

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             reply	other threads:[~2021-11-21 17:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-21 17:52 nicholasbishop [this message]
2021-11-23  3:54 ` [edk2-devel] Bug report: serial timeout gets overwritten shortly after setting it Michael D Kinney
2021-12-04  7:19   ` nicholasbishop

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