diff options
Diffstat (limited to 'man4/initrd.4')
| -rw-r--r-- | man4/initrd.4 | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/man4/initrd.4 b/man4/initrd.4 index 28a16ea..1490f8e 100644 --- a/man4/initrd.4 +++ b/man4/initrd.4 @@ -12,7 +12,7 @@ .\" phone: (302)654-5478 .\" .\" $Id: initrd.4,v 0.9 1997/11/07 05:05:32 kallal Exp kallal $ -.TH initrd 4 2023-02-05 "Linux man-pages 6.05.01" +.TH initrd 4 2023-10-31 "Linux man-pages 6.7" .SH NAME initrd \- boot loader initialized RAM disk .SH CONFIGURATION @@ -27,14 +27,14 @@ with mode 0400 (read access by root only). If the Linux system does not have .I /dev/initrd already created, it can be created with the following commands: -.PP +.P .in +4n .EX mknod \-m 400 /dev/initrd b 1 250 chown root:disk /dev/initrd .EE .in -.PP +.P Also, support for both "RAM disk" and "Initial RAM disk" (e.g., .B CONFIG_BLK_DEV_RAM=y @@ -57,7 +57,7 @@ by the boot loader before the kernel is started. The kernel then can use .IR /dev/initrd "'s" contents for a two-phase system boot-up. -.PP +.P In the first boot-up phase, the kernel starts up and mounts an initial root filesystem from the contents of .I /dev/initrd @@ -233,7 +233,7 @@ For more information on setting the root filesystem see also the and .B LOADLIN documentation. -.PP +.P It is also possible for the .I /linuxrc executable to change the normal root device. @@ -265,19 +265,19 @@ and then writing 0xff (e.g., the pseudo-NFS-device number) into file For example, the following shell command line would change the normal root device to .IR /dev/hdb1 : -.PP +.P .in +4n .EX echo 0x365 >/proc/sys/kernel/real\-root\-dev .EE .in -.PP +.P For an NFS example, the following shell command lines would change the normal root device to the NFS directory .I /var/nfsroot on a local networked NFS server with IP number 193.8.232.7 for a system with IP number 193.8.232.2 and named "idefix": -.PP +.P .in +4n .EX echo /var/nfsroot >/proc/sys/kernel/nfs\-root\-name @@ -286,7 +286,7 @@ echo 193.8.232.2:193.8.232.7::255.255.255.0:idefix \e echo 255 >/proc/sys/kernel/real\-root\-dev .EE .in -.PP +.P .BR Note : The use of .I /proc/sys/kernel/real\-root\-dev @@ -310,7 +310,7 @@ for information on the modern method of changing the root filesystem. The main motivation for implementing .B initrd was to allow for modular kernel configuration at system installation. -.PP +.P A possible system installation scenario is as follows: .IP (1) 5 The loader program boots from floppy or other media with a minimal kernel @@ -364,13 +364,13 @@ to a file.) .IP (9) The system is now bootable and additional installation tasks can be performed. -.PP +.P The key role of .I /dev/initrd in the above is to reuse the configuration data during normal system operation without requiring initial kernel selection, a large generic kernel or, recompiling the kernel. -.PP +.P A second scenario is for installations where Linux runs on systems with different hardware configurations in a single administrative network. In such cases, it may be desirable to use only a small set of kernels @@ -383,14 +383,14 @@ Then, only the file or a file executed by .I /linuxrc would be different. -.PP +.P A third scenario is more convenient recovery disks. Because information like the location of the root filesystem partition is not needed at boot time, the system loaded from .I /dev/initrd can use a dialog and/or auto-detection followed by a possible sanity check. -.PP +.P Last but not least, Linux distributions on CD-ROM may use .B initrd for easy installation from the CD-ROM. @@ -469,7 +469,7 @@ The behavior may change in future versions of the Linux kernel. .BR ram (4), .BR freeramdisk (8), .BR rdev (8) -.PP +.P .I Documentation/admin\-guide/initrd.rst .\" commit 9d85025b0418163fae079c9ba8f8445212de8568 (or |