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[PATCH] MIPS: document the cca= command-line parameter

Subject: [PATCH] MIPS: document the cca= command-line parameter
From: Florian Fainelli <>
Date: Wed, 25 Jun 2014 16:41:13 -0700
Cc:,,,, Florian Fainelli <>
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Commit 351336929ccf222ae38ff0cb7a8dd5fd5c6236a0 ("[MIPS] Allow setting
of the cache attribute at run time") introduced the 'cca=' kernel
command-line parameter which allows overriding the kernel pages
cacheable attributes, document that parameter.

Signed-off-by: Florian Fainelli <>
 Documentation/kernel-parameters.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/kernel-parameters.txt 
index 6eaa9cdb7094..d6f26d017dc0 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -566,6 +566,11 @@ bytes respectively. Such letter suffixes can also be 
entirely omitted.
                        possible to determine what the correct size should be.
                        This option provides an override for these situations.
+       cca=            [MIPS] Override the kernel pages cacheable attribute.
+                       Accepted values range from 0 to 7 inclusive. See
+                       arch/mips/include/asm/pgtable-bits.h for platform
+                       specific values (SB1, Loongson3 and others).
        ccw_timeout_log [S390]
                        See Documentation/s390/CommonIO for details.

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