Date: Sat, 1 Jan 2005 07:40:32 -0600 (GMT+6) From: john <[EMAIL PROTECTED]> Subject: Re: [LIB] dma
On Fri, 31 Dec 2004, Philip Nienhuis wrote:
Date: Fri, 31 Dec 2004 17:35:00 +0100 From: Philip Nienhuis <[EMAIL PROTECTED]> Subject: Re: [LIB] dma
John Musielewicz wrote:
Date: Tue, 28 Dec 2004 09:07:48 -0800 (PST) From: John Musielewicz <[EMAIL PROTECTED]> Subject: dma
I was messing around with the kernel in linux v. 2.6.9 and now when my libby 110CT boots it reports that my hard drive isn't using dma. I have a 60GB toshiba installed without overlay. I checked the kernel and I have everything selected to use dma but I had the intel driver installed for the hard drive but I don't believe it uses that. does anyone know what driver I should install? The drive is ok for speed without dma
If you care to take a look on http://www.photoengineering.com/laptop/L100mm.pdf, (your own site isn't it) you'll see in Fig. 1-3 that the Libretto's internal HDD is on the 16 bit ISA bus. A 16 bit ISA bus doesn't support DMA :-( DMA is only possible on 32-bit PCI buses.
16 bit busses do support dma but for some reason its not connected on the hard drive. For example the sound chip is on the same isa mini bus and it has dma support in the bios. There are 2 dma lines in a standard 44 pin ide line (which is what the libby uses) and for some reason they are not connected which translates into half speed for the hard drive. It should be going at 5MB per sec and is only getting 2.5.
Do you enable a 66MHz bus for the libby? I enabled 32 bit access and it seems to mess things up with 16bit bus and 66 MHz.FWIW, I usually select "Generic IDE" when compiling Linux kernels.
but it is too slow to play movies and I really like watching them on the libby--it has such a nice screen. I can get them to work but I have to reduce the resolution and that sucks. Thanks for any help--I'd really like to get this working!!
DMA is supported on the cardbus slots (but then again I've read somewhere they use event polling rather than IRQ). In line with this, I've noticed faster I/O on the cardbus slots than on the internal HDD.... (but not much faster.)
I tried running a movie off the cardbus slots once the hd got slow and it wouldn't do it very well. the flashcard i/o was so slow the sound was running double speed as compard to the video
Using a cardbus CDRW/DVD combo (Freecom Traveler II+), DVD playback under Win2K on a L110 is a bit choppy but not so much that all fun is spoiled..... (save for the noise of the combo player).
I can't play movies at all under windows. neither sound nor video will run. even just sound (mp3s) is so bad--choppy, slow, hangs--nasty to listen to.
john
Philip
