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authorNathan Scott <nathans@sgi.com>2006-07-14 03:24:10 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-15 00:53:53 -0400
commit086626a747300e37043a553dac639c5900c4a2c0 (patch)
tree9aedfc36ef8fda99a83add9e92ce5f18c427528e
parent22c4af4092fc2e037ce2e2922023fc222cf0c443 (diff)
[PATCH] Update ramdisk documentation
The default ramdisk blocksize is actually 1024, not 512 bytes. Also fixes up some trailing whitespace issues. Signed-off-by: Nathan Scott <nathans@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--Documentation/ramdisk.txt12
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/ramdisk.txt b/Documentation/ramdisk.txt
index 7c25584e082c..52f75b7d51c2 100644
--- a/Documentation/ramdisk.txt
+++ b/Documentation/ramdisk.txt
@@ -6,7 +6,7 @@ Contents:
6 1) Overview 6 1) Overview
7 2) Kernel Command Line Parameters 7 2) Kernel Command Line Parameters
8 3) Using "rdev -r" 8 3) Using "rdev -r"
9 4) An Example of Creating a Compressed RAM Disk 9 4) An Example of Creating a Compressed RAM Disk
10 10
11 11
121) Overview 121) Overview
@@ -34,7 +34,7 @@ make it clearer. The original "ramdisk=<ram_size>" has been kept around for
34compatibility reasons, but it may be removed in the future. 34compatibility reasons, but it may be removed in the future.
35 35
36The new RAM disk also has the ability to load compressed RAM disk images, 36The new RAM disk also has the ability to load compressed RAM disk images,
37allowing one to squeeze more programs onto an average installation or 37allowing one to squeeze more programs onto an average installation or
38rescue floppy disk. 38rescue floppy disk.
39 39
40 40
@@ -51,7 +51,7 @@ default is 4096 (4 MB) (8192 (8 MB) on S390).
51 =================== 51 ===================
52 52
53This parameter tells the RAM disk driver how many bytes to use per block. The 53This parameter tells the RAM disk driver how many bytes to use per block. The
54default is 512. 54default is 1024 (BLOCK_SIZE).
55 55
56 56
573) Using "rdev -r" 573) Using "rdev -r"
@@ -70,7 +70,7 @@ These numbers are no magical secrets, as seen below:
70./arch/i386/kernel/setup.c:#define RAMDISK_PROMPT_FLAG 0x8000 70./arch/i386/kernel/setup.c:#define RAMDISK_PROMPT_FLAG 0x8000
71./arch/i386/kernel/setup.c:#define RAMDISK_LOAD_FLAG 0x4000 71./arch/i386/kernel/setup.c:#define RAMDISK_LOAD_FLAG 0x4000
72 72
73Consider a typical two floppy disk setup, where you will have the 73Consider a typical two floppy disk setup, where you will have the
74kernel on disk one, and have already put a RAM disk image onto disk #2. 74kernel on disk one, and have already put a RAM disk image onto disk #2.
75 75
76Hence you want to set bits 0 to 13 as 0, meaning that your RAM disk 76Hence you want to set bits 0 to 13 as 0, meaning that your RAM disk
@@ -97,12 +97,12 @@ Since the default start = 0 and the default prompt = 1, you could use:
97 append = "load_ramdisk=1" 97 append = "load_ramdisk=1"
98 98
99 99
1004) An Example of Creating a Compressed RAM Disk 1004) An Example of Creating a Compressed RAM Disk
101---------------------------------------------- 101----------------------------------------------
102 102
103To create a RAM disk image, you will need a spare block device to 103To create a RAM disk image, you will need a spare block device to
104construct it on. This can be the RAM disk device itself, or an 104construct it on. This can be the RAM disk device itself, or an
105unused disk partition (such as an unmounted swap partition). For this 105unused disk partition (such as an unmounted swap partition). For this
106example, we will use the RAM disk device, "/dev/ram0". 106example, we will use the RAM disk device, "/dev/ram0".
107 107
108Note: This technique should not be done on a machine with less than 8 MB 108Note: This technique should not be done on a machine with less than 8 MB