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List: freebsd-hackers
Subject: Re: IO-APIC interrupt delivery mode on Ryzen
From: Andriy Gapon <avg () FreeBSD ! org>
Date: 2022-01-13 8:12:31
Message-ID: 54e5f61c-64fd-0ebf-c3cd-d4a7a4cbb7e7 () FreeBSD ! org
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On 14/02/2018 09:16, Andriy Gapon wrote:
>
> A while ago I discovered that all AMD IO-APICs (in separate southbridges and in
> FCHs) had a bug with respect to how the interrupt delivery mode got interpreted.
> I am curious if the problem has been fixed in Ryzen or if it is being carried on.
>
> I would appreciate any help with testing that.
>
> The discussion of the problem and the tests I used can be found in this thread:
> https://mail.coreboot.org/pipermail/coreboot/2016-October/082148.html
> https://mail.coreboot.org/pipermail/coreboot/2016-October/082156.html
>
> If you are interested and it's not really clear how to conduct a test, please
> write me.
FWIW, Ryzen IO-APICs do not have the problem.
They interpret the delivery mode according to the APIC specification, not the
HyperTransport one.
--
Andriy Gapon
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