Re: acpi_find_bmc() and acpi_get_table()

[Corey Minyard <minyard@acm.org>]

Alexey Starikovskiy wrote:
> Bjorn Helgaas wrote:
>> On Thursday 15 February 2007 22:15, Corey Minyard wrote:
>>  
>>> Bjorn Helgaas wrote:
>>>    
>>>> On Saturday 10 February 2007 21:27, Len Brown wrote:
>>>>        
>>>>> acpi_find_bmc() appears to be searching for multiple SPMI tables 
>>>>> in the RSDT and running
>>>>> try_init_acpi() on each of them
>>>>> until it doesn't find any more.
>>>>>             
>>>> I can't remember why we look at the SPMI table(s) rather than
>>>> registering a normal ACPI (or even PNP) driver.  Unless we
>>>> need to poke the BMC very early, wouldn't it be better to
>>>> rely on the device description in the namespace?
>>>>         
>>> For some strange reason the normal ACPI information does not
>>> have all the information needed by the driver.  It doesn't have
>>> register size or spacing information.
>>>     
>>
>> I guess that would be a defect in the way ACPI is being used,
>> wouldn't it?  A PNP ID should define the device programming
>> model, including things like register size and spacing.  It
>> sounds like somebody didn't define a new PNP ID when he should
>> have.  I wonder whether it's worth trying to fix this.
>>
>>   
> Yes, it is considered an ACPI fault. Could you please describe in 
> detail, which registers miss the information? And probably your 
> acpidump will help as well.
I don't have a machine with an ACPI description of the BMC.  I'll copy 
the mailing list to see if anyone has an ACPI-described BMC.

I don't know that much about ACPI, so maybe that information is 
described somehow in a way the IPMI spec doesn't talk about directly, 
like in the _CRS object.

-Corey

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