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FDC(4) FreeBSD Kernel Interfaces Manual FDC(4) NAME fdc -- PC architecture floppy disk controller driver SYNOPSIS device fdc0 at isa? port IO_FD1 flags 0x1 irq 6 drq 2 device fd0 at fdc0 drive 0 device fd1 at fdc0 drive 1 DESCRIPTION This driver provides access to floppy disk drives and QIC40/80 tapedrives. In /dev for each floppy device a number of minor devices are present. The /dev/fd* devices with trailing alphabetic characters are used to indicate `partitions' on the floppy disk. The /dev/fd*.<number> are devices that indicate the size of the floppy disk (so: 720kB, 1440kB etc). The latter are used for formatting disks using fdformat or for accessing different density disks in multidensity drive. Example: 720kB disk in a 1.44Mb drive. Normally, the driver will ask the system's CMOS memory to obtain the floppy drive configuration. Some machines do not store any form of a configuration value in their CMOS. Use the flags value `0x1' to pretend a 1.44 MB floppy drive as the first unit, without asking the CMOS for it. The flags value `0x2' is reserved for PCMCIA floppy use, and should never be set in a configuration file directly. It is internally handled in the driver if the compilation option FDC_YE is set, and defers device prob- ing. Normally, the device driver detects FDC chipsets that have an internal FIFO, and enables the FIFO on them. There is a slight chance that this feature is actually misdetected (seen on an IBM Thinkpad 755c), so it can be turned off using flags `0x4'. FILES /dev/fd* floppy disk device nodes /dev/fd*._size in kB_ floppy disk device nodes where the trailing number indicates the floppy capacity /sys/i386/conf/GENERIC sample generic kernel config file /sys/isa/fd.c floppy driver source SEE ALSO fdformat(1), disktab(5) FreeBSD 11.1 August 31, 1994 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO
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