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Date: Sat, 13 May 2006 18:36:48 +0000
From: Marcin Jessa <lists@yazzy.org>
To: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua>
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Cc: des@des.no, harikurniawan@gmail.com, current@freebsd.org
Subject: Re: DMA no active on HL-DT-STCD-RW/DVD
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On Sat, 13 May 2006 19:19:30 +0300 (EEST)
Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> wrote:

> 
> Hello!
> 
> On Sat, 13 May 2006, Angka H. K. wrote:
> > By the way what is WDMA and why it saying PIO not WDMA ?
> 
>   WDMA corresponds to so-called "multiword DMA" transfer mode. It's slower than
> UDMA (IIRC WDMA2 gives 16Mbytes/s, same as PIO4), but still should be 
> sufficient for CD/DVD drive (well, up to 8x-speed DVDs). Of course, it's 
> better to use WDMA2 than PIO4 because WDMA (as well as UDMA) doesn't use
> CPU cycles for moving data between RAM and device. FreeBSD's ata driver
> is quite conservative, and doesn't automatically enable WDMA mode for
> ATAPI device even if hw.ata.atapi_dma=1, so you should just enable
> this mode with atacontrol. E.g., you can add

Does this mean I should set my laptop's drive mode to WDMA2 instead of
UDMA100 (HD) and UDMA33 (CDRW)?

Marcin.