What is zImage in Linux?

What is zImage in Linux?

zImage – A compressed version of the Linux kernel image that is automatically extracted. uImage – An image file that has a U-Boot container (installed by the mkimage utility) that includes the operating system type and loader information. A very common practice (for example, the typical Linux kernel Makefile) is to use a zImage.

What is zImage and bzImage?

zImage (make zImage) This is the old format for small kernels (compressed, under 512 KB). At startup, this image loads with little memory (first 640 KB of RAM). bzImage (make bzImage)

What are Atags?

The Atags is a list of information about certain aspects of the hardware. This list is created by the bootloader before our kernel loads. The bootloader places it at address 0x100 and also passes that address to the kernel through the r2 register.

What is a Rootfs image?

A rootfs image is just a file system image, hosting at least one boot system. … Note that whatever filesystem you choose to use, support for it will have to be compiled into the kernel so that it can be mounted at boot time.

How do you get zImage?

A zImage file contains a compressed Linux kernel image. If not available pre-built, create it using compile kernel sources with make zImage . The initramfs created by mkinitcpio is a cpio file that contains the files from an initial ram filesystem that is used at startup.

What is the difference between uImage and zImage?

zImage – A compressed version of the Linux kernel image that is automatically extracted. uImage – An image file that has a U-Boot container (installed by the mkimage utility) that includes the operating system type and loader information.

Why is it called vmlinuz?

The original UNIX kernel binary developed at Bell Labs was called unix. … Y because the Linux kernel executable was converted to a compressed file and compressed files usually have the extension az or gz on Unix-like systems, the name of the compressed kernel executable became vmlinuz.

What is Initramfs on Linux?

initramfs is the solution presented for Linux kernel 2.6 series. … This means that the firmware files are available before the kernel drivers are loaded. Userspace init is called instead of prepare_namespace. All root device discovery and md configuration happens in user space.

Why is the Linux kernel compressed?

Traditionally, when creating a bootable kernel image, the kernel is also compressed using gzip or, since Linux 2.6. … In the SPARC architecture, the vmlinux file is compressed using plain gzip, because the SILO bootloader transparently decompresses gzipped images.

How does Busybox work?

Busybox allows you or programs to perform actions on your phone using Linux commands (copied from Unix). Android is basically a specialized Linux operating system with a Java compatible machine (Dalvik) to run programs.

Conclusion

Let me know in the comments what you think about this blog post. about What is zImage in Linux?. Did you find it helpful? What questions do you still have? I’d love to hear your thoughts!
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