Messages in this thread | | | Date | Wed, 24 Jul 2002 18:37:28 -0400 | From | Pete Zaitcev <> | Subject | Re: Safety of IRQ during i/o |
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>[...] > 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.
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