Messages in this thread | | | Date | Sat, 25 Jun 2005 22:09:53 +0200 | From | Vojtech Pavlik <> | Subject | Re: [ltp] IBM HDAPS Someone interested? (Accelerometer) |
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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.
-- Vojtech Pavlik SuSE Labs, SuSE CR - 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/
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