Searching for Kernel Cpio Support information? Find all needed info by using official links provided below.
https://www.kernel.org/doc/html/v4.12/admin-guide/initrd.html
Second, the kernel has to be compiled with RAM disk support and with support for the initial RAM disk enabled. Also, at least all components needed to execute programs from initrd (e.g. executable format and file system) must be compiled into the kernel. Third, you have to create the RAM disk image.
https://www.linux.com/tutorials/kernel-newbie-corner-initrd-and-initramfs-whats/
Sep 30, 2009 · This week, I’m not going to write a formal column so much as just free associate a bit regarding an exchange we had recently on the Kernel Newbies mailing list regarding the ideas of initrd and initramfs, and what they’re for and, most importantly, how they differ. And that’s where we might get deliberately vague […]Author: Rob Day
https://www.kernel.org/doc/html/latest/driver-api/early-userspace/early_userspace_support.html
The cpio file format used by initramfs is the “newc” (aka “cpio -H newc”) format, and is documented in the file “buffer-format.txt”. There are two ways to add an early userspace image: specify an existing cpio archive to be used as the image or have the kernel build process build the image from specifications.
https://developer.ibm.com/technologies/linux/articles/l-initrd/
Beginning with Fedora Core 3, the default initrd image is a compressed cpio archive file. Instead of mounting the file as a compressed image using the loop device, you can use a cpio archive. To inspect the contents of a cpio archive, use the following commands: ... Initrd support in the Linux kernel. For the Linux kernel to support the initial ...
https://patchwork.kernel.org/cover/10957495/
May 23, 2019 · The CPIO parser in the kernel recognizes these special files from the file name, and calls the appropriate parser to add metadata to the previously extracted file. It has been proposed to use bit 17:16 of the file mode as a way to recognize files with metadata, but both the kernel and the cpio tool declare the file mode as unsigned short.
https://www.xilinx.com/support/answers/70141.html
AR# 70141 2017.1-2017.4 Zynq UltraScale+ MPSoC: Xen kernel panic when booting large rootfs.cpio.gz.u-boot file
https://www.linux.com/tutorials/kernel-newbie-corner-initrd-and-initramfs-some-unfinished-business/
Oct 08, 2009 · Finally, whether you even have kernel support for initrd and initramfs is based on whether you select the kernel config option BLK_DEV_INITRD, defined in the file init/Kconfig. Chances are, unless you’re working in a restricted (perhaps embedded) environment, you’ll have that support selected.Author: Rob Day
https://www.linuxquestions.org/questions/debian-26/compiling-kernel-without-initrd-support-457689-print/page2.html
If your initrd is a compressed cpio archive and you mount it anyway, it will look empty, when in reality it is not. I will see the same thing for my SuSE's initrd file. The decompressed initrd file (a copy) will mount using the ramfs filesystem and look empty.
https://stackoverflow.com/questions/10437995/initramfs-built-into-custom-linux-kernel-is-not-running
I am building a custom initramfs image that I am building as a CPIO archive into the Linux kernel (3.2). The issue I am having is that no matter what I try, the kernel does not appear to even attempt to run from the initramfs.
https://bugzilla.kernel.org/show_bug.cgi?id=203431
What seems to be working is only to attach the created cpio archive directly to your /boot/initrd* (or however is the boot kernel called on your distro. A word of caution: Every kernel 5.* (as it seems) already has a cpio archive attached to it, containing AuthenticAMD.bin (I guess it is some kind of an AMD-related firmware).
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