Update kernel parameter document for libata DMA mode setting knobs.
authorFD Cami <francois.cami@free.fr>
Sun, 6 Jan 2008 18:08:56 +0000 (19:08 +0100)
committerJeff Garzik <jeff@garzik.org>
Thu, 10 Jan 2008 21:53:55 +0000 (16:53 -0500)
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Documentation/kernel-parameters.txt

index e5b447a0acdad3444e9780fb253a032cce3a0535..c4178778e7fd01d65b99b2279aecad0727701770 100644 (file)
@@ -883,6 +883,14 @@ and is between 256 and 4096 characters. It is defined in the file
        lapic_timer_c2_ok       [X86-32,x86-64,APIC] trust the local apic timer in
                        C2 power state.
 
+       libata.dma=     [LIBATA] DMA control
+                       libata.dma=0      Disable all PATA and SATA DMA
+                       libata.dma=1      PATA and SATA Disk DMA only
+                       libata.dma=2      ATAPI (CDROM) DMA only
+                       libata.dma=4      Compact Flash DMA only 
+                       Combinations also work, so libata.dma=3 enables DMA
+                       for disks and CDROMs, but not CFs.
+
        libata.noacpi   [LIBATA] Disables use of ACPI in libata suspend/resume
                        when set.
                        Format: <int>