mkfs.cramfs

creates a compressed ROM filesystem inside a partition

TLDR

Create cramfs from directory

$ sudo mkfs.cramfs [path/to/directory] /dev/sdXY

Create with volume name

$ sudo mkfs.cramfs -n [volume_name] [path/to/directory] /dev/sdXY

SYNOPSIS

mkfs.cramfs [options] directory device

DESCRIPTION

mkfs.cramfs creates a compressed ROM filesystem (cramfs) inside a partition. Cramfs is a simple, read-only filesystem designed for small embedded systems and boot ROMs.

PARAMETERS

-n NAME

Set volume name (max 16 characters)

-E

Treat warnings as errors

-e EDITION

Set edition number

-b BLOCKSIZE

Block size (default: PAGE_SIZE)

-s, --sortbyname

Sort directory entries by name

CAVEATS

Read-only filesystem. Maximum file size of 16MB. Maximum filesystem size of 256MB. Designed for embedded use.