docs: ramdisk/initrd/initramfs corrections

initrd/initramfs/ramdisk docs:
- fix typos/spellos/grammar
- clarify RAM disk config location
- correct cpio option

Acked-by: Bryan O'Sullivan <[email protected]>
Acked-by: Rob Landley <[email protected]>
Cc: Werner Almesberger <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Acked-by: Jesper Juhl <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Randy Dunlap 2007-10-16 23:29:29 -07:00 • committed by Linus Torvalds
commit 1810732e94
4 changed files with 27 additions and 22 deletions

View file

@ -22,16 +22,21 @@ The RAM disk dynamically grows as more space is required. It does this by using
RAM from the buffer cache. The driver marks the buffers it is using as dirty
so that the VM subsystem does not try to reclaim them later.
Also, the RAM disk supports up to 16 RAM disks out of the box, and can
be reconfigured to support up to 255 RAM disks - change "#define NUM_RAMDISKS"
in drivers/block/rd.c. To use RAM disk support with your system, run
'./MAKEDEV ram' from the /dev directory. RAM disks are all major number 1, and
start with minor number 0 for /dev/ram0, etc. If used, modern kernels use
/dev/ram0 for an initrd.
The RAM disk supports up to 16 RAM disks by default, and can be reconfigured
to support an unlimited number of RAM disks (at your own risk). Just change
the configuration symbol BLK_DEV_RAM_COUNT in the Block drivers config menu
and (re)build the kernel.
To use RAM disk support with your system, run './MAKEDEV ram' from the /dev
directory. RAM disks are all major number 1, and start with minor number 0
for /dev/ram0, etc. If used, modern kernels use /dev/ram0 for an initrd.
The old "ramdisk=<ram_size>" has been changed to "ramdisk_size=<ram_size>" to
make it clearer. The original "ramdisk=<ram_size>" has been kept around for
compatibility reasons, but it may be removed in the future.
There are also config symbols (in the Block drivers config menu) for these
variables: BLK_DEV_RAM_SIZE defaults to 4096 and BLK_DEV_RAM_BLOCKSIZE
defaults to 1024.
The new RAM disk also has the ability to load compressed RAM disk images,
allowing one to squeeze more programs onto an average installation or