From: Alexander Gerasiov <gq@cs.msu.su>
To: linux-rt-users@vger.kernel.org
Subject: Boot IRQ issue on Intel C602J (Advantech ASMB-822)
Date: Mon, 8 Feb 2016 12:40:04 +0300 [thread overview]
Message-ID: <20160208124004.5a20494f@brick.gerasiov.net> (raw)
Hello there.
We are using 3.10.74-rt79 in our system and found some problem with
Advantech ASMB-822 motherboard.
It's Intel C602J based m/b with 2 IO-APIC.
We have 2 special PCIe adapters installed. They use legacy interrupts
through APIC.
On 3.10.74 one of adapter generate only several (~10) interrupts and
then halts. As I discovered, it works ok, but no interrupts was
delivered. The same time (but after device stops receiving irqs) boot
irqs occur and irq 16 got disabled by the kernel.
I tried 3.18.25 with the same result.
Right now I'm running 4.4.1-rt4 and finally it works, but there are
still boot irqs and kernel disables IRQ 16 because of them.
So I need some ideas, how to deal with boot interrupts on this chipset.
May be to add workaround like masking boot irq together with IO-APIC
irq.
PS If someone could give a clue, what was changed in 4.4.1 from 3.18
that would be great. (As I'm not sure we could switch production system
to 4.4.1 soon, and I'd like to backport this change set to old kernel if
possible.)
--
Best regards,
Alexander Gerasiov
Contacts:
e-mail: gq@cs.msu.su Homepage: http://gerasiov.net Skype: gerasiov
PGP fingerprint: 04B5 9D90 DF7C C2AB CD49 BAEA CA87 E9E8 2AAC 33F1
next reply other threads:[~2016-02-08 9:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 9:40 Alexander Gerasiov [this message]
2016-02-09 10:34 ` Boot IRQ issue on Intel C602J (Advantech ASMB-822) Thomas Gleixner
2016-02-09 13:42 ` Alexander Gerasiov
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