diff options
Diffstat (limited to 'share/man/man4/ahc.4')
| -rw-r--r-- | share/man/man4/ahc.4 | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/share/man/man4/ahc.4 b/share/man/man4/ahc.4 index 7d5e092089bb..38712c1f08b6 100644 --- a/share/man/man4/ahc.4 +++ b/share/man/man4/ahc.4 @@ -131,7 +131,7 @@ target on multiple SCSI IDs. .Pp To allow PCI adapters to use memory mapped I/O if enabled: .Pp -.Cd options AHC_ALLOW_MEMIO +.Cd options AHC_ALLOW_MEMIO=(0 -- disabled, 1 -- enabled) .Bd -ragged -offset indent Memory mapped I/O is more efficient than the alternative, programmed I/O. Most PCI BIOSes will map devices so that either technique for communicating @@ -141,12 +141,13 @@ the chip for memory mapped I/O. The typical symptom of this problem is a system hang if memory mapped I/O is attempted. .Pp Most modern motherboards perform the initialization correctly and work fine -with this option enabled. +with this option enabled and it is the default. This option can also be +dynamically configued through a device hint documented below. .Ed .Pp To statically configure one or more controllers to assume the target role: .Pp -.Cd options AHC_TMODE_ENABLE <bitmask of units> +.Cd options AHC_TMODE_ENABLE=<bitmask of units> .Bd -ragged -offset indent The value assigned to this option should be a bitmap of all units where target mode is desired. For example, a value of 0x25, would enable target mode on @@ -154,7 +155,6 @@ units 0, 2, and 5. A value of 0x8a enables it for units 1, 3, and 7. .Pp Note that controllers can be dynamically configured through a device hint documented below. -.El .Ed .Sh BOOT OPTIONS The following options are switchable by setting values in @@ -163,9 +163,12 @@ The following options are switchable by setting values in They are: .Bl -tag -width indent .It Va hint.ahc. Ns Ar N Ns Va .tmode_enable -A hint to define whether the SCSI target mode is enabled (0 -- disabled, 1 -- enabled). +A hint to define whether the SCSI target mode is enabled, defaults to disabled +(0 -- disabled, 1 -- enabled). +.It Va hint.ahc. Ns Ar N Ns Va .allow_memio +A hint to define whether memory mapped io is enabled or disabled for this +adapter, defaults to enabled (0 -- disabled, 1 -- enabled). .El -.Ed .Sh HARDWARE The .Nm |