The files under /proc are not regular files. They can be written and read as text files; but they don't behave exactly as text files. The contents of /proc/ide/hdc/settings (before my changes) are:
name value min max
mode
---- ----- --- ---
----
bios_cyl 0 0 1023
rw
bios_head 0 0 255
rw
bios_sect 0 0 63
rw
current_speed 66 0 70
rw
init_speed 12 0 70
rw
io_32bit 1 0 3
rw
keepsettings 1 0 1
rw
log 0 0 1
rw
nice1 1 0 1
rw
number 2 0 3
rw
pio_mode write-only 0 255
w
slow 0 0 1
rw
transform 1 0 3
rw
unmaskirq 1 0 1
rw
using_dma 0 0 1
rw
After doing 'echo "using_dma:1" > /proc/ide/hdc/settings', only the
"using_dma" line changes ('value' changes from 0 to 1). The files under
/proc are for direct communication with the kernel, to change parameters
on-the-fly.
Canek
On Thu, 2004-01-22 at 15:37, Krikket wrote:
> On Thu, 22 Jan 2004, Canek Peláez Valdés wrote:
>
> > You can use the /proc filesystem for the DMA and other things; I use
> > this at the end of my /etc/conf.d/local.start:
> >
> > # Performance settings for DVD
> > echo "using_dma:1" > /proc/ide/hdc/settings
> > echo "io_32bit:1" > /proc/ide/hdc/settings
> > echo "unmaskirq:1" > /proc/ide/hdc/settings
> > echo "keepsettings:1" > /proc/ide/hdc/settings
> >
> > # Performance settings for CD/RW
> > echo "using_dma:1" > /proc/ide/hdd/settings
> > echo "io_32bit:1" > /proc/ide/hdd/settings
> > echo "unmaskirq:1" > /proc/ide/hdd/settings
> > echo "keepsettings:1" > /proc/ide/hdd/settings
>
> Err, shouldn't most of those be >> and not > ? (Otherwise, what's the
> point of the first three lines in each case, as it is immediately
> over-written...)
>
> *Confused*
>
> Krikket
>
>
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