Re: boot command line length 256 ? 1024 ?

[Jim Cromie <jcromie@xxxxxxxxxx>]

Raseel Bhagat wrote:

> Jim Cromie wrote:
>
> > Im looking to try kgdb, but in my situation, the boot command line
> > is being truncated at 256 chars, so it wont take
> > the additional params (kgdbwait ..)
> >
> > I gather from syslinux list that the boot command line length
> > has long been limited to 256 chars, but that in release 3.08 (which 
> > Im using)
> > it was raised to 1023.  So its apparently the kernel thats truncating 
> > the boot-line.
> >
> >
> > However, Ive googled for combos of ' boot line length 256 1024 command '
> > and gotten nowhere, and also tried lkml.org search.
> >
> > Also, theres nothing in Documentation/kernel-parameters.txt,
> > it seems appropriate place for a 1-liner
>
>
> Hi Jim,
>  Have you tried grepping in <linux-src>/init/main.c
> That is the place, AFAIKwhere the command-line options are parsed in 
> the kernel.
ACK. 
Im not sure why I didnt think to do that.

[jimc@harpo lxbuild]$ grep COMMAND linux-2.6.12-rc5-mm2/include/asm-i386/*
linux-2.6.12-rc5-mm2/include/asm-i386/param.h:#define COMMAND_LINE_SIZE 256
linux-2.6.12-rc5-mm2/include/asm-i386/setup.h:#define COMMAND_LINE_SIZE 256

note- it changes based on platform, many others are 1024.
now to hack it larger, see what blows up..

thx

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