diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2009-12-01 15:31:16 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-02 10:11:01 +0100 |
| commit | c29d9db338db606c3335a03f337e1d4b7f6bb727 (patch) | |
| tree | d64763cd2a06af0d95b481a61c0ff6fcfa0de208 /README | |
| parent | ca64c47cecd0321b2e0dcbd7aaff44b68ce20654 (diff) | |
x86, ioapic: Fix the EOI register detection mechanism
Maciej W. Rozycki reported:
> 82093AA I/O APIC has its version set to 0x11 and it
> does not support the EOI register. Similarly I/O APICs
> integrated into the 82379AB south bridge and the 82374EB/SB
> EISA component.
IO-APIC versions below 0x20 don't support EOI register.
Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
version as 0x2. This is an error with documentation and these
ICH chips use io-apic's of version 0x20 and indeed has a working
EOI register for the io-apic.
Fix the EOI register detection mechanism to check for version
0x20 and beyond.
And also, a platform can potentially have io-apic's with
different versions. Make the EOI register check per io-apic.
Reported-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: ebiederm@xmission.com
Cc: garyhade@us.ibm.com
LKML-Reference: <20091201233335.065361533@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions