Re: [PATCH] Re: THE LINUX/I386 BOOT PROTOCOL - Breaking the 256 limit

[Alon Bar-Lev <alon.barlev@gmail.com>]

Hello,

1. Why don't you put this variable at config, and allow the user to
specify the length during configuration? I have a patch that does just
that.

2. THE MOST IMPORTANT task is to update the documentation at
i386/boot.txt so that it will state that boot protocol 2.02+ field
cmd_line_ptr should not be truncated and can be up to 4K bytes.
Also fix "The kernel command line is null-terminated string up to 255
characters long,..." this is good for the old boot protocol, but not
for the 2.02+ protocol.

Without this fix the bootloaders (Lilo, Grub) will not fix their
code... So that users will still will not be able to use > 256 command
line.

I've opened bug at Grub... and I wait for the documentation update so
that they will modify their behaviour of truncating the cmd_line_ptr
to 256.

Best Regards,
Alon Bar-Lev.


On 10/10/05, Jesper Juhl <jesper.juhl@gmail.com> wrote:
> On 10/10/05, Georg Lippold <georg.lippold@gmx.de> wrote:
> > Hello Peter,
> >
> > my first post didn't get any attention, maybe it was too short.
> > Here's a longer version:
> >
> > hpa@zytor.com wrote on Sept. 6th, 2005:
> >
> > [ wrt. COMMAND_LINE_SIZE=256 in linux/include/asm-i386/setup.h and
> > linux/include/asm-i386/param.h ]
> >
> > >> I would like to push forward the idea to extend the command-line size...
> > > [...]
> > > Already pushed to Andrew.  I will follow it up with a patch to extend
> > > the command line, at least to 512.
> >
> > I would like to know the status of this. In linux-2.6.14-rc3 the
> > COMMAND_LINE_SIZE is still 256 chars long.
> >
> > Here's a patch to fix that to 1024.
> >
>
> What about the other archs ?
>
> include/asm/setup.h:#define COMMAND_LINE_SIZE 256
> include/asm/param.h:#define COMMAND_LINE_SIZE 256
> include/asm-m68knommu/setup.h:#define COMMAND_LINE_SIZE 512
> include/asm-powerpc/setup.h:#define COMMAND_LINE_SIZE   512
> include/asm-sh/setup.h:#define COMMAND_LINE_SIZE 256
> include/asm-um/setup.h:#define COMMAND_LINE_SIZE 4096
> include/asm-parisc/setup.h:#define COMMAND_LINE_SIZE    1024
> include/asm-x86_64/setup.h:#define COMMAND_LINE_SIZE    256
> include/asm-xtensa/setup.h:#define COMMAND_LINE_SIZE    256
> include/asm-alpha/setup.h:#define COMMAND_LINE_SIZE     256
> include/asm-arm26/setup.h:#define COMMAND_LINE_SIZE 1024
> include/asm-h8300/setup.h:#define COMMAND_LINE_SIZE     512
> include/asm-sparc/setup.h:#define COMMAND_LINE_SIZE     256
> include/asm-i386/setup.h:#define COMMAND_LINE_SIZE 256
> include/asm-i386/param.h:#define COMMAND_LINE_SIZE 256
> include/asm-cris/setup.h:#define COMMAND_LINE_SIZE      256
> include/asm-m32r/setup.h:#define COMMAND_LINE_SIZE      (512)
> include/asm-ia64/setup.h:#define COMMAND_LINE_SIZE      512
> include/asm-m68k/setup.h:#define COMMAND_LINE_SIZE      CL_SIZE
> include/asm-mips/setup.h:#define COMMAND_LINE_SIZE      256
> include/asm-mips/bootinfo.h:#define CL_SIZE
> COMMAND_LINE_SIZE
> include/asm-s390/setup.h:#define COMMAND_LINE_SIZE      896
> include/asm-v850/setup.h:#define COMMAND_LINE_SIZE      512
> include/asm-sh64/setup.h:#define COMMAND_LINE_SIZE 256
> include/asm-arm/setup.h:#define COMMAND_LINE_SIZE 1024
> include/asm-frv/param.h:#define COMMAND_LINE_SIZE       512
> include/asm-sparc64/setup.h:#define COMMAND_LINE_SIZE   256
>
> Would it make sense to make it 1024 everywhere (and maybe move it out
> of arch specific files and just set it in one central place) ?
>
>
> --
> Jesper Juhl <jesper.juhl@gmail.com>
> Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
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