lkml.org 
[lkml]   [2005]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [ltp] IBM HDAPS Someone interested? (Accelerometer)
Vojtech Pavlik wrote:

>On Sat, Jun 25, 2005 at 01:13:17PM -0500, Alejandro Bonilla wrote:
>
>
>
>>I have a question here, how do you guys think that the head is parked,
>>is it done by the controller directly, which then sends the command to
>>the HD to park the head, or this is done by the operating system in some
>>kind of way?
>>
>>I think the OS or user space is too slow like to react to send a park
>>command to the hard drive, so this most be done directly by the embedded
>>controller, but still I think it needs some input from the OS, to
>>initialize it's settings.
>>
>>
>
>The only way to park a drive is to send a command to it through the IDE
>interface. This can't be done by the controller itself, since the
>controller in the ThinkPad is a classic Intel ICH chip which only passes
>commands around.
>
>The OS is definitely fast enough for this kind of task, it's doable even
>in userspace, although not easy.
>
>
>
>>i.e. after all, in windows you do have the settings in the software
>>for HDAPS, but it looks like it is _not_ managed by the operating
>>system at all if there is some type of action to be taken. This is
>>also probably why HDAPS won't kick in until booted, and that is
>>because it needs to load its config setup by the software.
>>
>>
>
>
>
>>This is what I think, please correct me if I'm saying something crazy.
>>
>>
>
>It is definitely all done by the windows kernel driver.
>
>
>
OK, So if this is done by the user space then I think we can play more
with it? I guess that we could do a type of hdparm -F or hdparm -S to
spin down the drive or maybe there is a way to add feature to hdparm to
park the drive itself.

Aside from what we should do when we get the data... How can we/us/I
start checking and see if we can find any response from the embedded
controller?

Do we have to backengineer everything, can we get anything of this from
IBM-ACPI, or our only way to go here is see if IBM will do anything?

Thanks for all the answers. I really don't want to drop the topic, so
that we can figure this one out.

.Alejandro
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-06-26 01:44    [W:0.200 / U:0.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site