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Document loader tunables hw.pci.enable_io_modes and

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hw.pci.allow_unsupported_io_range.

Submitted by:	 Hiten Pandya <hiten@angelica.unixdaemons.com>
Approved by:	 re (murray)
This commit is contained in:
Matthew N. Dodd 2002-11-13 09:43:53 +00:00
parent 1c54ff3315
commit 6b501f246a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106845
2 changed files with 24 additions and 0 deletions
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15
sys/boot/common/help.common
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@ -277,6 +277,21 @@
this option provides a hint as to the actual size of
system memory (which will be tested before use).
set hw.pci.allow_unsupported_io_range=<value>
Allow the PCI Bridge to pass through an unsupported
memory range assigned by the BIOS.
value is 0 (default) or non-zero to enable.
set hw.pci.enable_io_modes=<value>
Enable PCI resources which are left off by some BIOSes
or are not enabled correctly by the device driver.
value is 1 (default), but this may cause problems with
some peripherals. Set to 0 to disable.
################################################################################
# Tshow DShow the values of variables

9
sys/boot/common/loader.8
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@ -422,6 +422,15 @@ are also accepted and indicate kilobytes, megabytes and gigabytes
respectively.
An invalid suffix will result in the variable being ignored by the
kernel.
.It Va hw.pci.enable_io_modes
Enable PCI resources which are left off by some BIOSes or are not
enabled correctly by the device driver.
Tunable value set to ON (1) by default, but this may cause problems
with some peripherals.
.It Va hw.pci_allow_unsupported_io_range
Allow the PCI bridge to pass through an unsupported memory range
assigned by the BIOS.
Tunable value set to OFF (0) by default.
.It Va kern.maxusers
Set the size of a number of statically allocated system tables; see
.Xr tuning 7