Date: Tue, 26 Aug 2008 18:08:09 -0600 From: "Marauder" <marauder@pi.avalonnetworks.us> To: <freebsd-embedded@freebsd.org> Subject: DMA to ATA drive failure Message-ID: <48B4461C.5689.0089.0@pi.avalonnetworks.us>
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Hi,
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 =
code similar to this
storageFD =3D open("/dev/ad4", O_RDWR);
if (write(storageFD, configBlock, 512) =3D=3D -1) {
cout << "Error" << endl;
}
We currently make sure we are writing to the disk in full sector sizes =
(512 in this case) and im sure we have the disk open for write.
But for some reason on some machines that we do this on we get the =
following 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.
Any help would be greatly appreciated
Thanx
M
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