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From: Mikael Pettersson <mikpe@user.it.uu.se>
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Date: Fri, 28 Feb 2003 15:19:01 +0100
To: fauxpas@temp123.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: IOAPIC on Via KT266a
In-Reply-To: <20030227165248.GA12030@temp123.org>
References: <20030227165248.GA12030@temp123.org>
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fauxpas@temp123.org writes:
 > I have a UP system with Via kt266a chipset.  When I enable APIC in
 > the BIOS and in Linux, the system boots mostly normally, but I get
 > a fairly constant stream of
 > 
 > APIC error on CPU0: 02(02)
 > 
 > with a smattering of other numeric codes from time to time.  Most
 > things still work, but there are a number of oddities and instabilities,
 > most notably my integrated uhci USB controllers give usb bulk-msg
 > timeouts on every device.

02 is "Receive Checksum Error", and it's explained both in apic.c
and in Intel's IA32 Volume 3 manual.

This is almost certainly a hardware problem: your machine's APIC bus
is corrupting messages, or some other agent than the CPU is creating
corrupt messages. This isn't exactly unheard of for non-Intel chipsets.

Disable IO_APIC support and you should be fine. If you still get these
errors, you'll have to either live with them or disable UP local APIC
support as well.

/Mikael
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