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document host_start_mem.

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# feel free to wordsmith.

Suggested by: ru@
This commit is contained in:
Warner Losh 2004-10-15 06:59:07 +00:00
parent 7a49c8b37d
commit 99e085d9a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=136549
1 changed files with 12 additions and 0 deletions
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12
sys/boot/common/help.common
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@ -311,6 +311,18 @@
this option provides a hint as to the actual size of
system memory (which will be tested before use).
set hw.{acpi,pci}.host_start_mem=<value>
Sets the lowest address that the pci code will assign
when it doesn't have other information about the address
to assign (like from a pci bridge). This is only useful
in older systems without a pci bridge. Also, it only
impacts devices that the BIOS doesn't assign to, typically
CardBus bridges. The default <value> is 0x80000000, but
some systems need values like 0xf0000000, 0xfc000000 or
0xfe000000 may be suitable for older systems (the older
the system, the higher the number typically should be).
set hw.pci.enable_io_modes=<value>
Enable PCI resources which are left off by some BIOSes