`devb-ahci`

Driver for AHCI SATA interfaces (QNX Neutrino)

You must be root to start this driver.

Syntax:

devb-ahci [cam option[,option]...]
          [ahci option[,option]...]
          [blk option[,option]...] &

Options:

Use commas (,) to separate the options. You can put the cam, ahci, and blk groups of options in any order.

`cam` options

lun=mask: Enable Logical Unit Number (LUN) scan for the devices specified in mask. The mask is a hex bitmask specifying which IDs to scan for; the default is 0x00.
quiet: Be quiet: don't display any information on startup.
verbose: Be verbose: display full information about SCSI units (devices) on startup.

The ahci options control the driver's interface to the AHCI controller. If you've installed multiple controllers, you can repeat these options for each controller. Remember, however, to specify the ahci keyword before each controller's set of options.

Interface-specific options:

irq=req: The interrupt used by the controller.
vid=vid: The vendor ID of the controller.
did=did: The device ID of the controller.
pci=index: The PCI index of the controller in the machine, where index is a value between 0 and the number of adapters.
nobmstr: Don't use busmastering.
port=N,device: Specify options for device on port N.
priority=prio: Set the priority of the processing thread. The default is 21.
timeout=timeout: Set the I/O request timeout, in seconds. The default is 10.

Device-specific options:

geometry=heads:cyl:sect: Specify the drive geometry.
nobmstr: Don't use busmastering.
chs: Use Cylinder-Head-Sector mode. The default is LBA.

`blk` options

The blk options control io-blk.so. If specified, they must follow the blk keyword.

Description:

The devb-ahci supports the Intel AHCI SATA controller with the following device IDs:

ICH-6 82801FB_SATA 0x2651
ICH-6 82801FBM_SATA 0x2653
ICH-7 82801GB_SATA 0x27c1
ICH-7 82801GBM_SATA 0x27c5

You need to enable AHCI mode in the BIOS.

Examples:

Detect all SATA controllers, and list all connected devices:

devb-ahci &

Files:

The devb-ahci driver causes io-blk.so to adopt various block special devices under /dev. These devices are normally named hdn, where n is the physical unit number of the device.

This driver could also require the following shared objects:

Binary	Required
`cam-disk.so`	For hard-disk access.
`libcam.so`	Always

Exit status:

The devb-ahci driver terminates only if an error occurs during startup, or if it has successfully forked itself upon startup because it hadn't been initially started in the background.

0: The devb-ahci driver wasn't started in the background and therefore forked itself. The original process terminated with a zero exit status, the forked process continued.
> 0: An error occurred during startup.

Caveats:

Unless overridden with the blk automount= option (see io-blk.so), devices are mounted as:

Device	Mountpoint	Filesystem type
`/dev/hd0t77`	`/hd`	`qnx4`
`/dev/hd0t6`	`/dos`	`dos`
`/dev/hd0t11`	`/dos`	`dos`

While there's no limit to the size of a disk or partition, I/O (i.e. the lseek(), read() and write() functions) is currently limited to 2 gigabytes per partition (or disk). This I/O limit has no effect on the partition size for mounted filesystems.

Known supported functions include:

chmod(), chown(), close(), closedir(), creat(), devctl(), dup(), dup2(), fcntl(), fpathconf(), fstat(), lseek(), mkdir(), mkfifo(), mknod(), open(), opendir(), pathconf(), read(), readdir(), readlink(), rewinddir(), rmdir(), stat(), symlink(), unlink() (not supported for directories), utime(), write()

Note that certain calls (such as pipe(), as well as read() and write() on FIFOs) may require the pipe manager.