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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://sourceforge.net/p/squashfs/mailman/message/20972350/
Given this, with the introduction of UBIFS, it is now unnecessary to implement NAND support in Squashfs, because UBIFS does bad block remapping itself. The simple strategy of using UBIFS and then placing a Squashfs filesystem inside that gives you bad block remapping for free.
http://www.infradead.org/pipermail/linux-mtd/2006-April/015386.html
Providing native NAND support in Squashfs represents too much work for absolutely no gain. It is unlikely this is going to change in the near future.
https://github.com/fhunleth/u-boot-squashfs
May 18, 2018 · Experimental support for SquashFS in U-Boot. ... _NAND_ECCBYTES Defines the size and behavior of the NAND that SPL uses to read U-Boot CONFIG_SPL_NAND_BOOT Add support NAND boot CONFIG_SYS_NAND_U_BOOT_OFFS Location in NAND to read U-Boot from CONFIG_SYS_NAND_U_BOOT_DST Location in memory to load U-Boot to CONFIG_SYS_NAND…
https://www.analog10.com/posts/squashfs_on_ubifs.html
How to keep SquashFS from imploding on NAND flash? 2015.02.19 12:15. I do a lot of embedded Linux work and generally enjoy the privilege of working with SquashFS and NOR flash. SquashFS is a performant read-only compressed file systems that makes shipping Linux on small flash chips possible.
https://www.tldp.org/HOWTO/SquashFS-HOWTO/whatis.html
SquashFS is distributed as a Linux kernel source patch (which enables SquashFS read support in your kernel), the mksquashfs tool, which creates squashed file systems (in a file or on a block device) and the unsquashfs tool, which extracts multiple files from an existing squashed file system.
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.Max. file size: 16 EiB (2⁶⁴) bytes
https://lists.denx.de/pipermail/eldk/2013-January/002259.html
Your > squashfs file system is in NAND flash, so the normal way would be to > just access it through the MTD block device emulation in Linux. Yes,this standard process works fine. I would like to find out if my "unusual" configuration differs from the standard configuration with respect to the boot time and application start time.
http://www.infradead.org/pipermail/linux-mtd/2006-April/015390.html
> >> Providing native NAND support in Squashfs represents too much work for >> absolutely no gain. It is unlikely this is going to change in the near >> future. > > > There is gain in providing a generic mechansim that block type > filesystems can use to do this though.
https://www.tldp.org/HOWTO/SquashFS-HOWTO/creatingandusing.html
When developing a kernel for your system, make sure you enable SquashFS support so it can mount squashed file systems Use mksquashfs for creating read-only initial ram disks and/or root and/or other file systems Don't forget to set file system types to squashfs in /etc/fstab and/or the startup scripts of your system for mounting squashed file ...
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