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Diffstat (limited to 'Documentation/ramdisk.txt')
| -rw-r--r-- | Documentation/ramdisk.txt | 12 |
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 | ||
| 12 | 1) Overview | 12 | 1) Overview |
| @@ -34,7 +34,7 @@ make it clearer. The original "ramdisk=<ram_size>" has been kept around for | |||
| 34 | compatibility reasons, but it may be removed in the future. | 34 | compatibility reasons, but it may be removed in the future. |
| 35 | 35 | ||
| 36 | The new RAM disk also has the ability to load compressed RAM disk images, | 36 | The new RAM disk also has the ability to load compressed RAM disk images, |
| 37 | allowing one to squeeze more programs onto an average installation or | 37 | allowing one to squeeze more programs onto an average installation or |
| 38 | rescue floppy disk. | 38 | rescue floppy disk. |
| 39 | 39 | ||
| 40 | 40 | ||
| @@ -51,7 +51,7 @@ default is 4096 (4 MB) (8192 (8 MB) on S390). | |||
| 51 | =================== | 51 | =================== |
| 52 | 52 | ||
| 53 | This parameter tells the RAM disk driver how many bytes to use per block. The | 53 | This parameter tells the RAM disk driver how many bytes to use per block. The |
| 54 | default is 512. | 54 | default is 1024 (BLOCK_SIZE). |
| 55 | 55 | ||
| 56 | 56 | ||
| 57 | 3) Using "rdev -r" | 57 | 3) 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 | ||
| 73 | Consider a typical two floppy disk setup, where you will have the | 73 | Consider a typical two floppy disk setup, where you will have the |
| 74 | kernel on disk one, and have already put a RAM disk image onto disk #2. | 74 | kernel on disk one, and have already put a RAM disk image onto disk #2. |
| 75 | 75 | ||
| 76 | Hence you want to set bits 0 to 13 as 0, meaning that your RAM disk | 76 | Hence 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 | ||
| 100 | 4) An Example of Creating a Compressed RAM Disk | 100 | 4) An Example of Creating a Compressed RAM Disk |
| 101 | ---------------------------------------------- | 101 | ---------------------------------------------- |
| 102 | 102 | ||
| 103 | To create a RAM disk image, you will need a spare block device to | 103 | To create a RAM disk image, you will need a spare block device to |
| 104 | construct it on. This can be the RAM disk device itself, or an | 104 | construct it on. This can be the RAM disk device itself, or an |
| 105 | unused disk partition (such as an unmounted swap partition). For this | 105 | unused disk partition (such as an unmounted swap partition). For this |
| 106 | example, we will use the RAM disk device, "/dev/ram0". | 106 | example, we will use the RAM disk device, "/dev/ram0". |
| 107 | 107 | ||
| 108 | Note: This technique should not be done on a machine with less than 8 MB | 108 | Note: This technique should not be done on a machine with less than 8 MB |