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Diffstat (limited to 'sys-utils/rdev.8')
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diff --git a/sys-utils/rdev.8 b/sys-utils/rdev.8 deleted file mode 100644 index 16d6420f..00000000 --- a/sys-utils/rdev.8 +++ /dev/null @@ -1,207 +0,0 @@ -.\" Copyright 1992, 1993 Rickard E. Faith (faith@cs.unc.edu) -.\" May be distributed under the GNU General Public License -.\" Changes from sct@dcs.ed.ac.uk added Sat Oct 9 09:54:00 1993. -.TH RDEV 8 "20 November 1993" "Linux 0.99" "Linux Programmer's Manual" -.SH NAME -rdev \- query/set image root device, RAM disk size, or video mode -.SH SYNOPSIS -.B rdev -.RB [ \-Rrvh ] -.RB [ \-o -.IR offset ] -.RI [ image -.RI [ value -.RI [ offset ]]] -.br -.B rdev -.RB [ \-o -.IR offset ] -.RI [ image -.RI [ root_device -.RI [ offset ]]] -.br -.B ramsize -.RB [ \-o -.IR offset ] -.RI [ image -.RI [ size -.RI [ offset ]]] -.br -.B vidmode -.RB [ \-o -.IR offset ] -.RI [ image -.RI [ mode -.RI [ offset ]]] -.br -.B rootflags -.RB [ \-o -.IR offset ] -.RI [ image -.RI [ flags -.RI [ offset ]]] -.SH DESCRIPTION -With no arguments, -.B rdev -outputs an -.I /etc/mtab -line for the current root file system. -With no arguments, -.BR 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: - -.nf -.RS - 498 Root flags -(500 and 502 Reserved) - 504 RAM Disk Size - 506 VGA Mode - 508 Root Device -(510 Boot Signature) -.RE -.fi - -.B rdev -will change these values. - -Typical values for the -.I image -parameter, which is a bootable Linux kernel image, might be: - -.nf -.RS -/vmlinux -/vmunix -/boot/bzImage-2.4.0 -/dev/fd0 -/dev/fd1 -.RE -.fi - -When using the -.B rdev -command, the -.I root_device -parameter might be something like: - -.nf -.RS -/dev/hda1 -/dev/hdf13 -/dev/sda2 -/dev/sdc4 -/dev/ida/c0d0p1 -.RE -.fi - -One may also specify the device by a comma-separated pair -of decimal integers -.IR major , minor . - -For the -.B ramsize -command, the -.I size -parameter specifies the size of the RAM disk in kilobytes. 2.0.x kernels -and newer dynamically allocate the ramdisk and do not need this setting. - -For the -.B rootflags -command, the -.I 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 -.I flags -is non-zero. - -For the -.B vidmode -command, the -.I mode -parameter specifies the video mode: - -.nf -.RS --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 -.RE -.fi - -If the -.I value -is not specified, the -.I image -will be examined to determine the current settings. -.SH OPTIONS -.TP -.B \-r -Causes -.B rdev -to act like -.BR ramsize -(Not relevant for 2.0.x and newer kernels). -.TP -.B \-R -Causes -.B rdev -to act like -.BR rootflags . -.TP -.B \-v -Causes -.B rdev -to act like -.BR vidmode . -.TP -.B \-h -Provides help. -.SH BUGS -The -.B rdev -utility, when used other than to find a name for the current root device, -is an ancient hack that works by patching a kernel image at a magic offset -with magic numbers. It does not work on architectures other than i386. -Its use is strongly discouraged. Use a boot loader like SysLinux or LILO -instead. -.SH HISTORY -At offset 502 there used to be the device number of the swap device -(in Linux 0.12), and "rdev -s" or "swapdev" would set this. -However, since Linux 0.95 this constant is not used any longer, -and the swap device is specified using the -.BR swapon (2) -system call. - -At offset 504 there used to be the size of the ramdisk in kilobytes. -One would specify a size, and this much was grabbed off the top of memory. -In Linux 1.1.39 it became also possible to set this value on the kernel -command line. -In Linux 1.3.48 the ramdisk setup was changed. Ramdisk memory is now -taken from the buffer cache, so that the ramdisk can grow dynamically. -The interpretation of the ramdisk word was changed to a word of which -the high order bit is a prompt flag (1: prompt for ramdisk: -"VFS: Insert ramdisk floppy and press ENTER" - this is needed with a -two-floppy boot), the next bit a load flag (1: load ramdisk), -and the low order 11 bits give the starting block number of the -root filesystem image (so that one can have a single floppy boot). -See also -.IR linux/Documentation/ramdisk.txt . -.SH AUTHORS -.nf -Originally by Werner Almesberger (almesber@nessie.cs.id.ethz.ch) -Modified by Peter MacDonald (pmacdona@sanjuan.UVic.CA) -rootflags support added by Stephen Tweedie (sct@dcs.ed.ac.uk) -.fi -.SH AVAILABILITY -The rdev command is part of the util-linux-ng package and is available from -ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. |