| FDC(4) | Device Drivers Manual | FDC(4) |
fdc —
fdc0 at isa? port 0x3f0 irq 6 drq 2 (alpha, amd64,
i386)
fdc* at sbus? (sparc64)
fd* at fdc? flags 0x00
fdc driver supports the standard AT floppy disk
controllers. These include standard IDE, MFM, RLL, EIDE, ESDI and SCSI
controllers with floppy attachment, commonly encountered on many isa bus
machines, as well as the on-board floppy controller found on most UltraSPARC
workstations.
The standard names of a floppy drive will take the form /dev/fd{0,1,2,3}{,B,C,D,E,F,G,H}[a-p].
The first component of this path is the unit number, permitting a total of 4 floppy drives. The next component is missing for the default geometry (it would be A, but it is omitted for simplicity) and B-H for the other 7 geometry types the floppy driver supports. The last component of the path is the 16 partitions that a floppy disk can support.
The additional geometry types are as follows:
The default geometry is the format specified in the BIOS, and is typically the largest supported format.
Some isa floppy controllers do not respond correctly to probes,
and the configuration file flags field can be used
to specify a particular drive type, overriding the probed type. If the 0x10
bit is on, the low order three bits of the flags
field encode the drive type, as follows:
If the 0x20 bit is on, the drive will be attached even if it was
not found by the probe routine. These flags are ignored on
fdc controllers not connected to an
isa(4) bus.
fdc driver can interfere with other
isa(4) controllers, namely some WD/SMC network
controllers fail to work when the probing mechanism in the
fdc driver probes for a missing second floppy drive.
In this case you should try recompiling the kernel replacing the relevant line
with fd0 at fdc?.
| September 1, 2016 | OpenBSD-current |