linux-kernel - Re: Please teach me X86 I/O port 0x61

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Date:	Thu, 22 Jul 2010 11:21:00 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	tanaka <tanaka_hideo@...oo.co.jp>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Please teach me X86 I/O port 0x61

On 07/22/10 10:57, tanaka wrote:
> Good evening. Dear all.
> 
> I appreciate your responses.
> We use AMD CPU machine.
> 
> For example,
> http://www.sun.com/servers/entry/x4100/arch-wp.pdf
> 
> In Figure 1-1 block diagram (page 10) ,
> which device is mapped 0x61 address in ?

I can't tell from that block diagram.  I tried to see if 0x61 is part of
the AMD-8111 chipset, but it seems that they have removed all downloads
from that web page
(http://www.amd.com/us/products/embedded/chipsets/Pages/other-embedded-chipset-products.aspx,
last 3 links are bad).

I would expect 0x61 to be part of the 8111 or possibly 8132 chipset.


> --- Randy Dunlap <randy.dunlap@...cle.com> wrote:
> 
>> On Fri, 16 Jul 2010 00:00:36 +0900 (JST) tanaka wrote:
>>
>>> Dear all.
>>>
>>> I investigate about  NMI kernel messages.
>>> Linux kernel read 0x61 address using inb(61h).
>>>
>>> I search a amd opteron cpu following manuals.
>>> but I do not find  explanation of 0x61 address.
>>>
>>>
>>
> http://support.amd.com/us/psearch/Pages/psearch.aspx?type=2.1&product=2.1.4&contentType=Tech+Doc+Processor&ostype=&keywords=&items=20
>>>
>>> Could you teach me a 0x61 address of X86 arch >
>>
>> Hi,
>>
>> IO port 0x61 (NMI Status & Control register) is not CPU-specific on
>> x86.
>> It's more of a platform thing.
>>
>> Intel describes it in ICH (chipset) specs, e.g., ICH7 spec,
>> section 10.7.1.  Please try that and see if it answers your
>> questions.
>>
>> ---


-- 
~Randy
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