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fdc.4: document fdc sysctls

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PR:		105608
MFC-after:	1 week
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Felix Johnson 2023-10-09 18:46:03 +07:00 committed by Eugene Grosbein
parent fee14577d5
commit 3523f0677e
1 changed files with 56 additions and 1 deletions
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share/man/man4/fdc.4
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@ -25,7 +25,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 7, 2017
.Dd October 10, 2023
.Dt FDC 4
.Os
.Sh NAME
@ -311,6 +311,61 @@ Third argument is a pointer to
This type is the same as being used in the per-drive configuration
flags, or in the CMOS configuration data or ACPI namespace on IA32 systems.
.El
.Sh SYSCTL VARIABLES
.Bl -tag -width "debug.fdc.debugflags"
.It Dv debug.fdc.debugflags
Selectively enable debugging by setting one or more flags.
.Bl -tag -width "0x40"
.It Dv 0x01
Dump device registers on reset.
.It Dv 0x02
When an IO operation completes, print the number of retries
when that number is greater than zero.
.It Dv 0x04
Print when the number of retries exceeds
.Dv debug.fdc.retries
.Pq Dv EIO .
Print when the option
.Dv FDOPT_NOERROR
is set and an error would have returned from a write operation.
.It Dv 0x08
Print detailed IO command information.
.It Dv 0x10
Print status registers.
.It Dv 0x20
Print detailed status registers when interrupts complete.
Print the source code line number close to the source of a
non-zero return from a thread worker operation.
.It Dv 0x40
Print when the disk appears to be lost.
Print cylinder, head, sector, and sector shift information
after a request to read an ID field.
Notify whether a disk probe resulted in finding a disk.
When detecting the density of media present, indicate whether
the autosensing was successful, and if so, the size of the
medium in kilobytes.
Print detailed type information when setting the drive type.
.It Dv 0x80
Print when an unknown IOCTL is used.
.El
.It Dv debug.fdc.fifo
For enhanced controllers, allows a non-default FIFO
threshold setting. The default is 8 bytes.
.It Dv debug.fdc.retries
Maximum number of retries to attempt. The default is 10.
.It Dv debug.fdc.spec1
Specification byte one (step-rate + head unload).
The default step rate is 6 ms. The default head unload
time is 240 ms.
.It Dv debug.fdc.spec2
Specification byte two (head load time + no-dma).
The default head load time is 16 ms, and no-dma is 0
.Pq disabled .
.It Dv debug.fdc.settle
Head settling time in
.Sy settle
/ hz seconds. The default value is set during device attach.
.El
.Sh FILES
.Bl -tag -width ".Pa /dev/fd*" -compact
.It Pa /dev/fd*