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Re: [Qemu-devel] enabling bus-master IDE driver

From: Jens Axboe
Subject: Re: [Qemu-devel] enabling bus-master IDE driver
Date: Fri, 5 Nov 2004 16:52:04 +0100

On Fri, Nov 05 2004, zitu wrote:
> Quoting Juergen Keil <address@hidden>:
> > > WIN_WRITEDMA_EXT & WIN_READDMA_EXT cases are not defined in hw/ide.c
> >
> > Aha, and Windows uses these commands, on small HDDs <= 128GB ?

At least Linux 2.6 will use them on any capacity drive, if the drive has
support for lba48. You can do bigger transfers that way,
WIN_READDMA/WRITEDMA can only do 128kb at the time.

But qemu does not flag lba48 support, so neither Linux nor Windows
should use the _EXT commands regardless.

Jens Axboe

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