Documentation: Explain pci=conf1,conf2 more verbosely

People complained that setting the PCI config space access mechanism
through "pci=conf1" or "pci=conf2" on the command line is not really
documented. Yeah, can you blame them? Look at what we have now.

So try to improve the situation a bit by explaining what those "conf1"
and "conf2" things actually mean.

See http://wiki.osdev.org/PCI for more info.

Suggested-by: Eric Morton <Eric.Morton@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
[jc: Added the above URL to the document too]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9b2970f..5e80a9b 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2736,10 +2736,16 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                                hardware access methods are allowed. Use this
                                if you experience crashes upon bootup and you
                                suspect they are caused by the BIOS.
-               conf1           [X86] Force use of PCI Configuration
-                               Mechanism 1.
-               conf2           [X86] Force use of PCI Configuration
-                               Mechanism 2.
+               conf1           [X86] Force use of PCI Configuration Access
+                               Mechanism 1 (config address in IO port 0xCF8,
+                               data in IO port 0xCFC, both 32-bit).
+               conf2           [X86] Force use of PCI Configuration Access
+                               Mechanism 2 (IO port 0xCF8 is an 8-bit port for
+                               the function, IO port 0xCFA, also 8-bit, sets
+                               bus number. The config space is then accessed
+                               through ports 0xC000-0xCFFF).
+                               See http://wiki.osdev.org/PCI for more info
+                               on the configuration access mechanisms.
                noaer           [PCIE] If the PCIEAER kernel config parameter is
                                enabled, this kernel boot option can be used to
                                disable the use of PCIE advanced error reporting.