Update kernel parameter document for libata DMA mode setting knobs.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e5b447a0acdad3444e9780fb253a032cce3a0535..c4178778e7fd01d65b99b2279aecad0727701770 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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>