Messages in this thread | | | Date | Sat, 25 Jun 2005 17:41:00 -0500 | From | Alejandro Bonilla <> | Subject | Re: [ltp] IBM HDAPS Someone interested? (Accelerometer) |
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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.
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