doc: kernel-parameters.txt: Add ide-generic.probe-mask

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
[ jc: wording tweaked slightly ]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 755314bd7de2..80620ce6d10e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1303,6 +1303,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         .cdrom .chs .ignore_cable are additional options
                         See Documentation/ide/ide.txt.
 
+        ide-generic.probe-mask= [HW] (E)IDE subsystem
+                        Format: <int>
+                        Probe mask for legacy ISA IDE ports.  Depending on
+                        platform up to 6 ports are supported, enabled by
+                        setting corresponding bits in the mask to 1.  The
+                        default value is 0x0, which has a special meaning.
+                        On systems that have PCI, it triggers scanning the
+                        PCI bus for the first and the second port, which
+                        are then probed.  On systems without PCI the value
+                        of 0x0 enables probing the two first ports as if it
+                        was 0x3.
+
         ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
                         Claim all unknown PCI IDE storage controllers.