diff options
author | mdodd <mdodd@FreeBSD.org> | 2002-11-13 09:43:53 +0000 |
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committer | mdodd <mdodd@FreeBSD.org> | 2002-11-13 09:43:53 +0000 |
commit | 69fdcfb8834201dcf4edf10fd2aef462662415e0 (patch) | |
tree | afc0a790ca64f0e2b8529f2f712994179551ef9d /sys/boot | |
parent | a119655a5eabbd7a97cb8c6c9bf5fc40162a093b (diff) | |
download | FreeBSD-src-69fdcfb8834201dcf4edf10fd2aef462662415e0.zip FreeBSD-src-69fdcfb8834201dcf4edf10fd2aef462662415e0.tar.gz |
Document loader tunables hw.pci.enable_io_modes and
hw.pci.allow_unsupported_io_range.
Submitted by: Hiten Pandya <hiten@angelica.unixdaemons.com>
Approved by: re (murray)
Diffstat (limited to 'sys/boot')
-rw-r--r-- | sys/boot/common/help.common | 15 | ||||
-rw-r--r-- | sys/boot/common/loader.8 | 9 |
2 files changed, 24 insertions, 0 deletions
diff --git a/sys/boot/common/help.common b/sys/boot/common/help.common index ad30a33..1a4689b 100644 --- a/sys/boot/common/help.common +++ b/sys/boot/common/help.common @@ -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 diff --git a/sys/boot/common/loader.8 b/sys/boot/common/loader.8 index a32be17..56faf91 100644 --- a/sys/boot/common/loader.8 +++ b/sys/boot/common/loader.8 @@ -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 |