Create a RAM disk

1. Create an image file

Generate a file that can be virtualized into a device. The file name is init. IMG.

# Dd If =/dev/Zero of = init. img bs = 102 COUNT = 500

Note: BS * count indicates the block device size (byte)

Format a block Device

# Mke2fs-M0-F init. img

2. configure root FS (root file system)

Load init. IMG and romfs to the host file system.

A. The current directory uClinux-DIST has two empty directories: Ram and Rom. Copy romfs. IMG from images/to uClinux-Dist /.

# Mount init. img ram/-o loop

# Mount romfs. img rom/-o loop

B. Create a directory required by ramfs, that is, create a subdirectory In the ram directory.

# Mkdir RAM/bin

# Mkdir RAM/dev

# Mkdir RAM/etc

# Mkdir RAM/var

C. Copy the required files from the ROM directory to the ram directory (ramfs)

# Cp-a ROM/etc/* RAM/etc/

# Cp-a ROM/bin/sh RAM/bin

# Cp-a ROM/bin/init RAM/bin/init

D. Create device Node)

# Mknod RAM/dev/ttys0 C 4 64

# Mknod RAM/dev/console C 5 1

3. Uninstall init. IMG and romfs. IMG to save init. IMG.

# Umount Ram

# Umount Rom