[ltp] Re: IBM HDAPS Someone interested?

[Michael Gaber]

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Alejandro Bonilla wrote:
> Pavel Machek wrote:
> 
>> Hi!
>>
>> Apple connects their accelerometer over i2c, see:
>>
>> http://www.kernelthread.com/software/ams/
>>
>> For some reverse engineering attempts, see:
>>
>> http://www.paul.sladen.org/thinkpad-r31/accelerometer.html
>>
>> According to IBM, it is *not* enabled during system bootup:
>>
>> http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-53167
>>
>> According to another text, BIOS know how to test accelerometer in some
>> kind of self test. Aha, here's the most interesting text:
>>
>> http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-53432
>>
>> According to this text:
>>
>> typical free-fall takes 300msec, but head unloading takes
>> 300-500msec. [So I had my computation right ;-)] ... "therefore, it is
>> too late to start head unloading after detecting free fall"...
>>
>> They really try to detect conditions just before free fall... and it
>> does not sound that difficult.
>>
>> Another clever trick is that if user is still using the mouse, machine
>> is probably not in free fall ;-). In pdf, they also mention few
>> .sys files. They should probably be disassembled to learn how the
>> interface works (hint hint), actually exported symbol names should be
>> quite helpfull in determining what function is the interesting one.
>>                                 Pavel
>>  
>>
> Pavel,
> 
>    Thanks for all this information and to everyone providing data. This
> is really want we want. But We need to know how to talk to the chip
> before getting any on these math results to work.
> 
> Try what Lenz said: watch -n1 cat /proc/acpi/ibm/ecdump
> 
> .Alejandro

so i tried this but i dont think there are any relevant changes in here.

the only changes are in 0x78 - 0x7a (perhaps related)
and in 0xa0, 0xa8, 0xaa (i dont't think relation there, because keeps
changing)

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