atapicam with DVD drive hang boot

Fabian Keil freebsd-listen at
Tue Jan 24 06:18:30 PST 2006

Andrey Smagin <samspeedu at> wrote:

> Hi, from few days Current to today morning Current, if load atapicam
> in boot time system freeze, after some minutes repeats:
> acd0: req=0xc5b10524 TEST_UNIT_READY semaphore timeout !! DANGER Will
> Robinson !!
> after about half hour system continues boot.

Did you read the ongoing thread "-CURRENT freeze at boot after update"?
It might be the same problem.

Disabling DMA for the drive is reported to help and Søren
already provided patches in message:
82eac8c60601240107t5750571xa70b95e439dab9b0 at

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