lkml.org 
[lkml]   [2000]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Persistent module storage [was Linux 2.4 Status / TODO page]
On Mon, 6 Nov 2000, Jeff Garzik wrote:

> Oliver Xymoron wrote:
> >
> > On Mon, 6 Nov 2000, David Woodhouse wrote:
> >
> > > The point here is that although I've put up with just keeping the sound
> > > driver loaded for the last few years, permanently taking up a large amount
> > > of DMA memory, the inter_module_xxx stuff that Keith is proposing would
> > > give us a simple way of storing the data which we want to store.
> > ...
> > > Being able to do it completely in userspace would be neater, though.
> >
> > I think there are a bunch of other devices that need stuff from userspace
> > before they fully init, namely the ones that load proprietary firmware
> > images. Will an approach like that work here?
>
> Some devices have a firmware.h that is compiled into the driver. A few
> sound devices use a function that loads a firmware file from userspace,
> given a filename. The comment in drivers/sound/sound_firmware.c says
> that this is a poor method, and that the recommended method for
> uploading firmware to a device is via ioctl.

Ioctl (or alternate device for plan9 groupies) is fine. My point is final
initialization of the device is obviously delayed until the firmware is
loaded. Adopting a similar strategy for initializing mixers (possibly
falling back to initializing with zero levels) minimizes the window
between resetting a device and having sane mixer settings.

--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:24    [W:0.102 / U:5.364 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site