Re: IOAPIC on Via KT266a

[Mikael Pettersson]

[e-mail] 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