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https://elinux.org/Squashfs_support_for_MTD_subsystem
Squashfs is already widely used on MTD devices (NAND flash etc.) in embedded systems, however, because Squashfs lacks native MTD support, this is currently performed via MTD's block device emulation (or via UBI or stored inside another MTD aware filesystem, i.e. YAFFS2/JFFS2).
https://en.wikipedia.org/wiki/Squash_FS
Squashfs is a compressed read-only file system for Linux.Squashfs compresses files, inodes and directories, and supports block sizes from 4 KiB up to 1 MiB for greater compression. Several compression algorithms are supported. Squashfs is also the name of free software, licensed under the GPL, for accessing Squashfs filesystems.. Squashfs is intended for general read-only …Max. file size: 16 EiB (2⁶⁴) bytes
https://www.tldp.org/HOWTO/SquashFS-HOWTO/whatis.html
SquashFS brings all this to a new level. It is a read-only file system that lets you compress whole file systems or single directories, write them to other devices/partitions or to ordinary files, and then mount them directly (if a device) or using a loopback device (if it is a file). The modular, compact system design of SquashFS is bliss.
http://www.devttys0.com/2014/08/mucking-about-with-squashfs/
Aug 20, 2014 · Although SquashFS 4.0 now supports a wide variety of compression types, ’twas not always thus. Prior to version 4, SquashFS only officially supported zlib compression. However, lzma compresses much smaller, so many embedded vendors hacked in lzma support, and of course they all did it in a slightly different way.
https://sourceforge.net/projects/squashfs/files/squashfs/squashfs4.3/
Welcome to Squashfs 4.3. This is the first release in over 3 years, and there are substantial improvements to stability, new compression options and compressors, speed optimisations, and new options for Mksquashfs/Unsquashfs. This is a tools only release, support for Squashfs filesystems is in mainline (2.6.29 and later).
https://elinux.org/Support_read-only_block_filesystems_on_MTD_flash
SquashFS is a block filesystem, but since it is read-only, it can be also used on a /dev/mtdblock<x> device, because it will never attempt to write on any block. The same applies to other block filesystems, provided they are mounted in read-only mode.
https://tldp.org/HOWTO/html_single/SquashFS-HOWTO/
It is only obligatory to compile SquashFS inside the kernel if you plan using squashed initial RAM disks (initrd). If you would like to use a squashed initial RAM disk, enable the "Initial RAM disk support" in the "Block devices" section.
https://unix.stackexchange.com/questions/90323/how-to-use-unsquashfs-with-lzma
I'm using Ubuntu 12.04. I want to unsquash an lzma image. I have done sudo apt-get squashfs-tools Now, when I do unsquashfs <squashed_image_filename> I get …
https://unix.stackexchange.com/questions/80305/mounting-a-squashfs-filesystem-in-read-write
If your system supports some uion-filesystem, such as aufs or overlayfs, you don't have to extract your original squashfs file.. For example the overlayfs is used( a kernel option to enable it): You can mount your squashfs.file to /fm or somewhere else first. Prepare a writable filesystem with 2 directories in it, say /to and /temp. prepare another writable directory /fin for the merged results.
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