[lkml]   [2002]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Safety of IRQ during i/o
> 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.

-- Pete
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:27    [W:0.069 / U:0.408 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site