Date: Thu, 28 Aug 2008 18:19:05 +0400 From: Stanislav Sedov <stas@FreeBSD.org> To: "Marauder" <marauder@pi.avalonnetworks.us> Cc: freebsd-embedded@freebsd.org Subject: Re: DMA to ATA drive failure Message-ID: <20080828181905.51458f1b.stas@FreeBSD.org> In-Reply-To: <48B4461C.5689.0089.0@pi.avalonnetworks.us> References: <48B4461C.5689.0089.0@pi.avalonnetworks.us>
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On Tue, 26 Aug 2008 18:08:09 -0600
"Marauder" <marauder@pi.avalonnetworks.us> mentioned:
> Hi,
>=20
> I have a system that needs to directly access the local storage device in=
are machine (In this case it is a ATA hard disk). To do that we are use co=
de similar to this
>=20
> storageFD =3D open("/dev/ad4", O_RDWR);
> if (write(storageFD, configBlock, 512) =3D=3D -1) {
> cout << "Error" << endl;
> }
>=20
> We currently make sure we are writing to the disk in full sector sizes (5=
12 in this case) and im sure we have the disk open for write.
>=20
> But for some reason on some machines that we do this on we get the follow=
ing error displayed from the kernel. "Aligned DMA transfer attempted. ad4: =
Setting up DMA failed" We have tried adding "SET hw.ata.ata_dma=3D0" in are=
loader.rc file with no luck.
>=20
> Any help would be greatly appreciated
> Thanx
What does atacontrol displays for the disk attached? And what hardware do
you use?
--=20
Stanislav Sedov
ST4096-RIPE
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