document host_start_mem.
# feel free to wordsmith. Suggested by: ru@
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2020-12-20 02:59:44 +00:00
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@ -311,6 +311,18 @@
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this option provides a hint as to the actual size of
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system memory (which will be tested before use).
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set hw.{acpi,pci}.host_start_mem=<value>
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Sets the lowest address that the pci code will assign
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when it doesn't have other information about the address
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to assign (like from a pci bridge). This is only useful
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in older systems without a pci bridge. Also, it only
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impacts devices that the BIOS doesn't assign to, typically
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CardBus bridges. The default <value> is 0x80000000, but
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some systems need values like 0xf0000000, 0xfc000000 or
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0xfe000000 may be suitable for older systems (the older
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the system, the higher the number typically should be).
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set hw.pci.enable_io_modes=<value>
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Enable PCI resources which are left off by some BIOSes
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