DMA to ATA drive failure

[Stanislav Sedov]

On Tue, 26 Aug 2008 18:08:09 -0600
"Marauder" <marauder at pi.avalonnetworks.us> mentioned:

> 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 = open("/dev/ad4", O_RDWR);
> if (write(storageFD, configBlock, 512) == -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=0" in are loader.rc file with no luck.
> 
> Any help would be greatly appreciated
> Thanx

What does atacontrol displays for the disk attached? And what hardware do
you use?

-- 
Stanislav Sedov
ST4096-RIPE
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