[LUG.ro] Re: [LUG.ro] Re: Instalacón de Red
Hat 7(Horacio Castellini)
Horacio Castellini
lugro@lugro.org.ar
Tue, 17 Feb 2004 09:27:28 -0300 (ART)
On Tue, 17 Feb 2004 jechevarria@frro.utn.edu.ar wrote:
>
> Horacio me sirvio tu respuesta, pero lo que no me funcionó fue el rdev.
Pues debes usar una imagen genérica que no requiera el uso de
initrd.img-2.4.18-1-686 por ejemplo... Como hacer esto en los nucleos 2.4
y 2.6 ya no sé pues hace tiempo que uso nucleos precompilados....
>
> Probe como vos lo escribiste y no anduvo, entonces probe desde el directorio
> boot donde esta vmlinuz y el comando se ejecuta, pero no hace nada, retorna
> de inmediato. Además no hizo nada porque el disco no bootea.
>
> ¿Tenes alguna idea de que pudo haber pasado?
Si esto es falla en la aplicación del comando rdev que crea un disco
booteable...
> ¿ Que es lo que hace el comando rdev ?
NAME
rdev - query/set image root device, RAM disk size, or
video mode
SYNOPSIS
rdev [ -rvh ] [ -o offset ] [ image [ value [ offset ] ] ]
rdev [ -o offset ] [ image [ root_device [ offset ] ] ]
ramsize [ -o offset ] [ image [ size [ offset ] ] ]
vidmode [ -o offset ] [ image [ mode [ offset ] ] ]
rootflags [ -o offset ] [ image [ flags [ offset ] ] ]
DESCRIPTION
With no arguments, rdev outputs an /etc/mtab line for the
current root file system. With no arguments, ramsize,
vidmode, and rootflags print usage information.
In a bootable image for the Linux kernel on i386, there
are several pairs of bytes which specify the root device,
the video mode, and the size of the RAM disk. These pairs
of bytes, by default, begin at offset 504 (decimal) in the
kernel image:
498 Root flags
(500 and 502 Reserved)
504 RAM Disk Size
506 VGA Mode
508 Root Device
(510 Boot Signature)
rdev will change these values.
Typical values for the image parameter, which is a
bootable Linux kernel image, might be:
/vmlinux
/vmunix
/boot/bzImage-2.4.0
/dev/fd0
/dev/fd1
When using the rdev command, the root_device parameter
might be something like:
/dev/hda1
/dev/hdf13
/dev/sda2
/dev/sdc4
/dev/ida/c0d0p1
One may also specify the device by a comma-separated pair
of decimal integers major,minor.
For the ramsize command, the size parameter specifies the
size of the RAM disk in kilobytes.
For the rootflags command, the flags parameter contains
extra information used when mounting root. Currently the
only effect of these flags is to force the kernel to mount
the root filesystem in readonly mode if flags is non-zero.
For the vidmode command, the mode parameter specifies the
video mode:
-3 = Prompt
-2 = Extended VGA
-1 = Normal VGA
0 = as if "0" was pressed at the prompt
1 = as if "1" was pressed at the prompt
2 = as if "2" was pressed at the prompt
n = as if "n" was pressed at the prompt
If the value is not specified, the image will be examined
to determine the current settings.
OPTIONS
-r Causes rdev to act like ramsize.
-R Causes rdev to act like rootflags.
-v Causes rdev to act like vidmode.
-h Provides help.
D'accorde Monsieur.... ;)