NAME¶
hv_ata_pci_disengage —
Hyper-V ATA PCI Disengage driver
SYNOPSIS¶
To compile this driver into the kernel, place the following lines in the system
kernel configuration file:
device hyperv
DESCRIPTION¶
The
hv_ata_pci_disengage driver prevents the
native
FreeBSD ATA driver from loading in the presence
of Hyper-V.
FreeBSD guests running on Hyper-V can take
advantage of the Hyper-V Storage Virtual Consumer
(
hv_storvsc(4)) for using their IDE devices.
Since the ATA driver serves IDE devices as well, there is a chance that the
ATA driver may interfere with the operations of
hv_storvsc(4). The
hv_ata_pci_disengage driver avoids
conflicts between the ATA driver and
hv_storvsc(4) by disabling the ATA driver when
the
FreeBSD guest is booting.
A side effect of disabling the ATA driver is that CDROM may become inoperational
on
FreeBSD guest partitions. If CDROM access is a must
then users may use "set hw.ata.disk_enable=1" at boot time to
prevent the ATA driver from being disabled.
SEE ALSO¶
hv_vmbus(4),
hv_utils(4),
hv_netvsc(4),
hv_storvsc(4)
HISTORY¶
Support for
hv_ata_pci_disengage first
appeared in
FreeBSD 10.0. The driver was developed
through a joint effort between Citrix Incorporated, Microsoft Corporation, and
Network Appliance Incorporated.
AUTHORS¶
FreeBSD support for
hv_ata_pci_disengage was first added by
Microsoft BSD Integration Services Team
⟨bsdic@microsoft.com⟩.
