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virtio_blk(4) [freebsd man page]

VIRTIO_BLK(4)						   BSD Kernel Interfaces Manual 					     VIRTIO_BLK(4)

NAME
virtio_blk -- VirtIO Block driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device virtio_blk Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): virtio_blk_load="YES" DESCRIPTION
The virtio_blk device driver provides support for VirtIO block devices. LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.vtblk.no_ident hw.vtblk.X.no_ident These tunables disable retrieving the device identification string from the hypervisor either globally or per-device. The default value is 0. hw.vtblk.writecache_mode hw.vtblk.X.writecache_mode These tunables determine the write cache mode globally or per-device. The mode can changed only if the ConfigWCE feature is negoti- ated. Set to 0 for writethrough mode, 1 for writeback mode, and -1 to leave it as-is. The default value is to leave as-is. SYSCTL VARIABLES
The following variables are available as sysctl(8) variables. dev.vtblk.X.writecache_mode The write cache mode of the device can be either writethrough (0) or writeback (1). If the ConfigWCE feature is negotiated, the write cache mode can be toggled between writethrough and writeback. SEE ALSO
virtio(4) HISTORY
The virtio_blk driver was written by Bryan Venteicher <bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0. BSD
July 2, 2013 BSD

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SND_VIA8233(4)						   BSD Kernel Interfaces Manual 					    SND_VIA8233(4)

NAME
snd_via8233 -- VIA Technologies VT8233 bridge device driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device sound device snd_via8233 Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): snd_via8233_load="YES" DESCRIPTION
The snd_via8233 bridge driver allows the generic audio driver, sound(4), to attach to the VIA VT8233 audio devices. These audio chipsets are integrated in the southbridge on many VIA based motherboards. Runtime Configuration The following sysctl(8) variables are available in addition to those available to all sound(4) devices: dev.pcm.%d.polling Experimental polling mode, where the driver operates by querying the device state on each tick using callout(9). Polling is disabled by default. Do not enable it unless you are facing weird interrupt problems or if the device cannot generate interrupts at all. HARDWARE
The snd_via8233 driver supports the following audio chipsets: o VIA VT8233 o VIA VT8233A o VIA VT8233C o VIA VT8235 o VIA VT8237 o VIA VT8251 SEE ALSO
sound(4) HISTORY
The snd_via8233 device driver first appeared in FreeBSD 4.7. AUTHORS
This manual page was written by Joel Dahl <joel@FreeBSD.org>. BUGS
The snd_via8233 driver does not support S/PDIF. There is partial support in the code, so implementing it should be fairly easy if the right hardware is available. BSD
November 29, 2006 BSD
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