Driver for floppy disk interface (QNX Neutrino)
|You must be root to start this driver.|
devb-fdc [cam option[,option]...] [disk option[,option]...] [fdc option[,option]...] [blk option[,option]...] &
|Use commas (,) to separate the options. You can put the cam, disk, fdc, and blk groups of options in any order.|
The disk options control the driver's interface to cam-disk.so. If specified, they must follow the disk keyword.
The fdc options control the driver's interface to the fdc controller. If you've installed multiple controllers, you can repeat these options for each controller. Remember, however, to specify the fdc keyword before each controller's set of options.
The blk options control io-blk.so. If specified, they must follow the blk keyword.
The devb-fdc driver is for the floppy disk interface. It autodetects interfaces at address 0x3f0, interrupt 6, dma channel 2 by default. If you have an interface at a different address/interrupt/dma, specify them to the driver using the fdc options.
Assume an FDC interface, and list all connected devices:
Mount a floppy drive that can access QNX or DOS floppy disks:
devb-fdc blk cache=128k & mount -tqnx4 /dev/fd0 /qnxflop mount -tdos /dev/fd0 /dosflop
devb-fdc blk cache=128k,automount=+fd0:/qnxflop:qnx4,\ automount=+fd0:/dosflop:dos &
The devb-fdc driver causes io-blk.so to adopt various block special devices under /dev. These devices are normally named fdn, where n is the physical unit number of the device.
This driver could also require the following shared objects:
|cam-disk.so||For floppy-disk access.|
The devb-fdc 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.
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.
cam-*, devb-*, fdformat, fs-*, io-blk.so
Connecting Hardware chapter, and “Filesystems and block I/O (devb-*) drivers” in the Fine-Tuning Your System chapter of the QNX Neutrino User's Guide