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Re: how to increase commandline size

From: Jeff Chua
Subject: Re: how to increase commandline size
Date: Thu, 21 Sep 2006 11:50:53 +0800 (SGT)

On Thu, 21 Sep 2006, Yoshinori K. Okuji wrote:

The kernel command line is a null-terminated string currently up to
255 characters long, plus the final null.  A string that is too long
will be automatically truncated by the kernel, a boot loader may allow
a longer command line to be passed to permit future kernels to extend
this limit.

I've been using the patch below to extend the command line to 2k, but grub2 can't handle it. "loadlin" works.

Enlarge i386/x86-64 kernel command line to 2k

This is useful when the kernel command line is used to pass other
information to initrds or installers.

On i386 it was duplicated for unknown reasons.

Signed-off-by: Andi Kleen <address@hidden>

Index: linux/include/asm-i386/setup.h
--- linux.orig/include/asm-i386/setup.h 2005-01-04 12:13:21.%N +0100
+++ linux/include/asm-i386/setup.h      2005-01-10 17:37:54.%N +0100
@@ -17,5 +17,5 @@
 #define PARAM_SIZE 4096
-#define COMMAND_LINE_SIZE 256
+#define COMMAND_LINE_SIZE 2048

 #define OLD_CL_MAGIC_ADDR      0x90020
 #define OLD_CL_MAGIC           0xA33F
Index: linux/include/asm-i386/param.h
--- linux.orig/include/asm-i386/param.h 2004-08-15 19:45:46.%N +0200
+++ linux/include/asm-i386/param.h      2005-01-10 17:38:16.%N +0100
@@ -18,6 +18,6 @@

 #define MAXHOSTNAMELEN 64      /* max length of hostname */
-#define COMMAND_LINE_SIZE 256
+#define COMMAND_LINE_SIZE 2048


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