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Re: Marvell SATA driver
From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Date: Sun, 19 Jul 2009 22:25:50 +0900
> > > > I think the option 'PCIIDE_OPTIONS_NODMA' is options for pciide(4).
> > > > the mvsata(4) not use and not include pciide.
> > > But isn't it better to use cf_flags like pciide(4) rather than
> > > options in config(5) and #ifdefs?
> > Please specify flags of wd(4) if you do not use DMA for a HDD in which
> > you are. see man wd(4).
> I'm not asking howto, but design.
> My question is:
> "Is there any particular reason why do you choose a different method
> (i.e. #ifdef with options) from other ATA drivers to disable DMA?"
The DMA of mvsata is different from pciide and wdc. However, it becomes
compatible wdc when operating only by PIO. I think that the size of the
processing of DMA is obstructive in this case.
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