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[RFC] Don't pass filename in multiboot command line

From: Vladimir 'phcoder' Serbinenko
Subject: [RFC] Don't pass filename in multiboot command line
Date: Sat, 1 Aug 2009 15:23:04 +0200

According to multiboot specification "It should be possible to write
compliant boot loaders that load the OS image from a variety of
sources, including floppy disk, hard disk, and across a network. "
It implicitly says that kernel shouldn't care about filename used by
bootloader. About commandline it's only said:
"If bit 2 of the `flags' longword is set, the `cmdline' field is
valid, and contains the physical address of the command line to be
passed to the kernel. The command line is a normal C-style
zero-terminated string"
Currently grub however passes filename as first argument of command line.
Felix Zielcke did a series of tests and it revealed that OSes
subdivide into two categories:
1) Ones that don't care whether this argument is omitted altogether or
not (e.g. the don't ignore second argument even if filename is
2) Solaris (for kernel name) and AROS (for module name) both assume
that filename is the same under grub and OS. This assumption isn't
necessarily true. These OSes are broken one way or another. If we omit
the first argument user can workaround the problem by supplying
kernel/module OS  image name as first argument of multiboot/module
command line
multiboot /RPOOL/opensolaris/@/platform/i86pc/kernel /platform/i86pc/kernel
Vladimir 'phcoder' Serbinenko

Personal git repository:

Attachment: mbcmd.diff
Description: Text document

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