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author | sheldonh <sheldonh@FreeBSD.org> | 2000-04-03 13:07:33 +0000 |
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committer | sheldonh <sheldonh@FreeBSD.org> | 2000-04-03 13:07:33 +0000 |
commit | 4ae4d58ad1f372034eb1670ac25fbe17761b88ab (patch) | |
tree | 9c896510ac4c66290f11f62398e5e228ad9f1715 /share | |
parent | d43514ac7509d2c04c3161d389957f2912148ce4 (diff) | |
download | FreeBSD-src-4ae4d58ad1f372034eb1670ac25fbe17761b88ab.zip FreeBSD-src-4ae4d58ad1f372034eb1670ac25fbe17761b88ab.tar.gz |
Explain static numbering.
Reviewed by: asmodai
Diffstat (limited to 'share')
-rw-r--r-- | share/man/man4/ata.4 | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/share/man/man4/ata.4 b/share/man/man4/ata.4 index e804ce0..fab1bf6 100644 --- a/share/man/man4/ata.4 +++ b/share/man/man4/ata.4 @@ -56,10 +56,10 @@ such as the ZIP and LS120: To support ATAPI tape drives: .Cd device atapist .Pp -To set the controller numbering to static, -just like the deprecated -.Xr wd 4 -driver: +To enable static controller and device numbering +(see the +.Sx NOTES +section below): .Cd options ATA_STATIC_ID .Pp To enable DMA on an ATAPI device: @@ -157,6 +157,18 @@ ATAPI tape drive device nodes sample generic kernel config file for ata based systems .El .Sh NOTES +Static numbering +(enabled with the +.Dv ATA_STATIC_ID +kernel option) +reserves a number for each possibly connected disk, +even when not present. +This may result in odd situations where, +for example, +ad0 and ad2 exist in the absence of ad1. +The advantage is that the addition of the formerly absent drive +does not cause the numbers of the other drives to change. +.Pp The ata driver does not support MFM/RLL/ESDI (ST-506) style disks. .Pp Remember that in order to use UDMA4 mode you |