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Kernel boot params

DISCUSSION Timothy A. DeWees 5 participants 5 messages Dec 6, 2000 – Dec 14, 2000

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Timothy A. DeWees

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#0 lore raw

Kernel Hackers,

Could someone be so kind to point me to a page where I can find
a list of parameters I can pass to a kernel on boot. I am looking for a way to load drivers at boot (like if a RAID controller fails - and I don't have the exact replacement: how can I load a new driver). I am really just looking for the doc. Thanks in advance!

--
Kind Regards,
Timothy A. DeWees

#1 lore raw

On Wed, Dec 06, 2000 at 08:31:31AM -0500, Timothy A. DeWees wrote:

Hi!

Quoted 1 line

a list of parameters I can pass to a kernel on boot. I am looking for

./linux/init/main.c

MfG, JBG

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#2 lore raw
In reply to Timothy A. DeWees
Quoted 2 lines

Could someone be so kind to point me to a page where I can find
a list of parameters I can pass to a kernel on boot.

AFAIK, the Linux BootPrompt-HowTo is what you are looking for, however, it doesn't provide a FULL list of kernel arguments, for which you are directed to the sources:-)

Guennadi
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#4 lore raw
In reply to Timothy A. DeWees
Quoted 2 lines · Timothy A. DeWees

Could someone be so kind to point me to a page where I can find
a list of parameters I can pass to a kernel on boot.

The following script lists almost all parameters your 2.4 kernel accepts.

The exceptions are parameters obtained via non-standard means, i.e.
- init= in init/main.c
- mem=, nopentium, etc. in arch/*/kernel/setup.c (i386 examples)
- anything your boot loader catches and hides (e.g. vga=, initrd=)

Only tested on i386. Probably works on other 32 bit platforms, but not on true 64 bit platforms. Should do more error checking.

Usage:

./lss.pl /wherever/vmlinux

- Werner

----------------------------------- lss.pl ------------------------------------

#!/usr/bin/perl
open(KERNEL,$ARGV[0]) || die "open $ARGV[0]: $!";

for (split("\n",`objdump -h $ARGV[0]`)) {
    next unless /^\s*\d+\s+(\S+)\s+(\S+)\s+(\S+)\s+\S+\s+(\S+)/;
    ($size{$1}, $addr{$1}, $offset{$1}) = (hex $2, hex $3, hex $4);
}
die "kernel too old for __setup" unless defined $size{".setup.init"};
for ($i = 0; $i < $size{".setup.init"}; $i += 8) {
    sysseek(KERNEL,$offset{".setup.init"}+$i,0);
    sysread(KERNEL,$pos,4);
    $pos = unpack("L",$pos);
    sysseek(KERNEL,$pos-$addr{".data.init"}+$offset{".data.init"},0);
    sysread(KERNEL,$str,256);
    $str =~ s/\000.*/\n/s;
    print $str;
}
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