How to create Uboot Initramfs Image for arm64

Question

I have initramfs file in gz format (initramfs.cpio.gz). I tried to boot with above gz file, but it shows following error.

Wrong Ramdisk Image Format Ramdisk image is corrupt or invalid

Then i tried to convert the cpio.gz image to uboot supported format by using below command.

mkimage -n 'Ramdisk Image' -A arm -O linux -T ramdisk -C gzip -d initramfs.cpio.gz initramfs.uImage

But there is no support for arm64 in mkimage tool.

Please advice how to create uboot supported arm64 initramfs file.

Thanks in advance.

Solution

After installing the proper uboot tools in host machine, i am able to get the AARCH64 initramfs image successfully.

Cmd:

sudo apt-get install u-boot-tools


root@OptiPlex-790:~$ mkimage -A arm64 -O linux -T ramdisk -C gzip -d init.cpio.gz initramfs.uImage
Image Name:   
Created:      Tue Sep 20 18:14:33 2016
Image Type:   AArch64 Linux RAMDisk Image (gzip compressed)
Data Size:    10240 Bytes = 10.00 kB = 0.01 MB
Load Address: 00000000
Entry Point:  00000000

Comments

[Rui F Ribeiro]

My ARM devices at home do not use initramfs.

[Tom Rini]

While correct you may also wish to use either a FIT image or make sure that CONFIG_SUPPORT_RAW_INITRD is set and just pass the location along with your (Linux Kernel generated) Image file to booti.

[CoOl]

I'm asking for clarification on behalf of user @GT with insufficient reputation to post a comment: What version of u-boot-tools are you running? I am doing an apt-get install, and it is finding version 2013.10-3. I tried giving it the -A arm64 flag, and it prints this out : Invalid CPU Type - valid names are: alpha, arm, x86, ia64, m68k, microblaze, mips, mips64, nios2, powerpc, ppc, s390, sh, sparc, sparc64, blackfin, avr32, nds32, or1k, sandbox. So what is the "proper" version? Thank you.