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https://en.wikipedia.org/wiki/Cramfs
The compressed ROM file system (or cramfs) is a free (GPL'ed) read-only Linux file system designed for simplicity and space-efficiency. It is mainly used in embedded and small-footprint systems. Unlike a compressed image of a conventional file system, a cramfs image can be used as it is, i.e. without first decompressing it.Supported operating systems: Linux
https://bisqwit.iki.fi/source/cromfs.html
Cromfs: Compressed ROM filesystem for Linux (user-space) 1. Purpose. Cromfs is a compressed read-only filesystem for Linux. It uses the LZMA compression algorithm from 7-zip, and a powerful block merging mechanism, that is especially efficient with gigabytes of large files …
https://www.linux4sam.org/bin/view/Linux4SAM/BuildRootFAQ
File systems +--Miscellaneous filesystems +--Compressed ROM file system support (cramfs) Set the variable bootargs to pass Linux kernel boot argument "command line" in u-boot: setenv bootargs 'mem=64M console=ttyS0,115200 initrd=0x21100000,17000000 ramdisk_size=15360 root=/dev/ram0'
http://manpages.ubuntu.com/manpages/bionic/man8/mkfs.cramfs.8.html
Files on cramfs file systems are zlib-compressed one page at a time to allow random read access. The metadata is not compressed, but is expressed in a terse representation that is more space-efficient than conventional file systems.
https://wiki.gentoo.org/wiki/Cramfs
Cramfs is a memory and space sensitive filesystem that supports random reading. Ideal for use as ROM, it avoids the block device layer entirely and useful in embedded systems …
http://processors.wiki.ti.com/index.php/CRAMFS_kernel_configuration
Under Device Drivers-> File systems-> Miscellaneous filesystems, check the Compressed ROM file system support (cramfs) box to enable cramfs file system support in the Linux kernel. You should see something like this: Continue configuring your kernel as needed for your system. Exit the configuration utility and save your configuration.
http://manpages.ubuntu.com/manpages/xenial/man8/mkfs.cramfs.8.html
Files on cramfs file systems are zlib-compressed one page at a time to allow random read access. The metadata is not compressed, but is expressed in a terse representation that is more space-efficient than conventional file systems.
https://www.systutorials.com/docs/linux/man/8-mkfs.cramfs/
Files on cramfs file systems are zlib-compressed one page at a time to allow random read access. The metadata is not compressed, but is expressed in a terse representation that is more space-efficient than conventional file systems.
https://support.eurotech-inc.com/forums/topic.asp%3FTOPIC_ID=1636.html
To mount a CRAMFS image on a Linux workstation, you will need kernel support for the CRAMFS filesystem (CONFIG_CRAMFS; File systems -> Compressed ROM file system support) and loopback block devices (CONFIG_BLK_DEVICE_LOOP; Block devices -> loopback device support). The kernels for ADS embedded systems have CRAMFS support built-in; if you wish to avoid …
https://github.com/torvalds/linux/commit/54886a7153353ea2bf21ebfc1b8e030e71d151d7
Nov 12, 2013 · config CRAMFS: tristate "Compressed ROM file system support (cramfs)" tristate "Compressed ROM file system support (cramfs) (OBSOLETE) " depends on BLOCK: select ZLIB_INFLATE: help @@ -16,4 +16,7 @@ config CRAMFS: cramfs. Note that the root file system (the one containing the: directory /) cannot be compiled as a module.
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