Messages in this thread | | | Date | Thu, 25 Jul 2002 00:42:47 +0200 (MET DST) | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: Safety of IRQ during i/o |
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On Wed, 24 Jul 2002, Pete Zaitcev wrote:
> >[...] > > I would think that this would be safe when using DMA, and likely to be > > safe for PIO and more recent chipsets, but I wouldn't want to actually > > tell anyone that. > > A little story from OLS. I have a 486/75 laptop, which can only > do PIO. It always was losing characters evern on 9600 baud on its > serial port, and I thought it was simply broken for five years.
:-)
> A guy who did a security talk showed me that doing hdparm -u > fixes the problem. Apparently, the lappy has a non-buffering UART. > > So, it seems that hdparm -u is a very useful thing for obsotele > boxes. If you do DMA, you probably do not care.
Yup, for PIO unmask (if possible) is a must.
--bzolnier
> -- Pete
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