Subject: Re: accessing IDE hard drive via pcmcia card (redirected from netbsd-users)
To: None <email@example.com>
From: ITOH Yasufumi <firstname.lastname@example.org>
Date: 05/23/2004 13:35:10
> On Sun, May 23, 2004 at 08:10:00AM +0900, ITOH Yasufumi wrote:
> > I think the problem is that the pcmcia/cardbus driver turns
> > on and off the device too frequently during probe/attach (kern/8731).
> It's been a while, but last I looked there was one power up-probe-power-down
> phase, optionally followed by another power-up-on-mount. I don't see how you
> could optimize that.
I have 1.6ZL (May 27, 2004) kernel, and I see at least two power on/off
cycles while probe and attach.
If we keeps power all the time, we will have more time to stabilize
> > I think we can fix both problems by delaying power down for a while
> > (say 5s) after power-down requests.
> There is a final flush command to the drive before power is turned off,
> so this should not be needed - IIUC.
The power-off delay is one method to avoid excessive power on-off cycles,
which might help for data integrity but is not required of course.