Manual Reference Pages - DEVICE.HINTS (5)
- device resource hints
file is read in by the boot
when the system is about to start, and its contents are
passed to the kernel.
It contains various variables to control the boot behavior of
These variables are typically
The file contains one variable per line.
Lines starting with the
character are comments and are ignored by the boot loader.
After the file is read by the boot loader, you may examine
the variables with the
command, and may add a new variable, modify an existing one,
or delete a variable with the
commands of the boot loader
After the system has started, you can dump these variables
Device hint variables are used by device drivers to set up
They are most often used by ISA device drivers to specify
where the driver will probe for the relevant devices, and what
resources it will attempt to use.
A device hint line looks like:
is the name of a device driver,
is the unit number, and
is the keyword of the hint.
The keyword may be:
specifies a bus to which the device is attached.
specifies the start address of I/O ports to be used by the device.
specifies the number of ports used by the device.
is the interrupt line number to be used.
is the DMA channel number.
specifies the physical memory address used by the device.
specifies the physical memory size used by the device.
sets various flag bits for the device.
can be set to
to disable the device.
A device driver may require one or more hint lines with these keywords,
and may accept other keywords not listed here, through
Consult individual device drivers manual pages for available
keywords and their possible values.
Device resource hints file.
| /sys/ ARCH /conf/GENERIC.hints
Sample resource hints for the
| /sys/ ARCH /conf/NOTES
Notes on the kernel configuration file and device resource hints.
The following example sets up resources for the
driver on the ISA bus:
The following example disables the ACPI driver:
file first appeared in
.Fx 5.0 .
Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.