> last night. It's a MiniITX board, model EN1200. My system can't remain
> up for more than 10minutes before something locks it up and frequently
> the screen will output error messages relating to DMA.


As a workaround, adding the line:
hw.ata.ata_dma="0"

To /boot/loader.conf will disable DMA and prevent the hangs that are caused by the DMA timeouts.

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