Table of Contents
What is Squashfs in Linux?
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.
What is Ubi Red Hat?
Announced at Red Hat Summit 2019, Red Hat Universal Base Images (UBI) are OCI-compliant container base operating system images with complementary runtime languages and packages that are freely redistributable. Like previous base images, they are built from portions of Red Hat Enterprise Linux.
What is BZ image in Linux?
The bzImage (big zImage) format was developed to overcome this limitation by splitting the kernel over non-contiguous memory regions. The bzImage was compressed using gzip until Linux 2.6. 30, which introduced more algorithms. Although the bz prefix may suggest that bzip2 compression is used, this is not the case.
What is Rootfs SquashFS?
SquashFS (http://goo.gl/WT6Lxf) is a compressed read-only file system for Linux on ODROID-XU4 based system series like the HC1, HC2, MC1 and XU3. RootFS (http://goo.gl/LMVjzS) corruption rate after power failures will be significantly reduced because SquashFS is a very robust file system.
What is Ubiattach?
ubiattach creates a UBI device from the MTD partition. This UBI device is then referred to by UBI as ubi0 (if it is the first device). ubimkvol creates a volume on a UBI device ; this volume is referred to as ubi0_0 (if it is the first volume on the device). ubiupdatevol puts an image on an empty volume. (
What is ubi8?
Red Hat Universal Base Image 8 by Red Hat. Red Hat Universal Base Images (UBI) are OCI-compliant container base operating system images with complementary runtime languages and packages that are freely redistributable.
Is Ubi open source?
Learn how this powerful open-source tool helps you manage components across containers in any environment.
What is uImage and zImage?
zImage: a compressed version of the Linux kernel image that is self-extracting. uImage: an image file that has a U-Boot wrapper (installed by the mkimage utility) that includes the OS type and loader information. A very common practice (e.g. the typical Linux kernel Makefile) is to use a zImage file.
What is initrd and vmlinuz in Linux?
The vmlinuz and initrd files are in a /boot directory. This directory is special — it is reserved for boot files, and the bootloader knows to look for this directory. It is generally a separate partition of the primary disk where the operating system is installed.
What is squashfs IMG?
The squashfs. img is a SquashFS compressed, read-only, file system holding the Fedora operating system root file system inside another /LiveOS folder containing a rootfs.
What is a UBI volume?
An UBI volume is a set of consecutive logical eraseblocks (LEBs). Each logical eraseblock is dynamically mapped to a physical eraseblock (PEB). This mapping is managed by UBI and is hidden from users and higher-level software.
What are MTD devices in Linux?
This article shows how kernel and application developers (in C) can make use of MTD Devices in Linux. MTD (Memory Technology Devices) are NAND/NOR-based flash memory chips used for storing non-volatile data like boot images and configurations.
What are the MTD character devices?
MTD character devices – usually referred to as /dev/mtd0, /dev/mtd1, and so on. These character devices provide I/O access to the raw flash. They support a number of ioctl calls for erasing eraseblocks, marking them as bad or checking if an eraseblock is bad, getting information about MTD devices, etc.
Should I use mtdblock or character device interface?
For the most part, you should always use the character device interface. NOTE: One notable exception is the JFFS2 filesystem, which uses the mtdblock handle to determine which device to mount. You must enable CONFIG_MTD_BLOCK=y for jffs2 support. However, even JFFS2 doesn’t actually use any of the mtdblock functionality.