> Some SATA controllers use 0xff to indicate empty port.  This seldomly
> matters as we have the almighty SStatus register to check device
> presence (there is a bug regarding this, patch pending).
> 
> This GoVault drive fails because ata_piix doesn't have SCR while using
> 0xff to indicate port not ready (dunno exact which state causes 0xff
> status tho) while the GoVault drive fails to clear that state in 150ms
> (not 30s).  The libata sees 0xff after SRST if GoVault drive is attached

So we can also cut this down by only doing the extra polling on a device
which is SATA and lacks SCR ?

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