Kernel panic - not syncing: junk in compressed archive

Hello all, I'm building a linux system for a new architecture, and I want to use initramfs support to build a filesystem. I have seen that there are several ways to do that with initramfs. Either the kernel will build the cpio archive for me, or I can provide an external one with the CONFIG_INITRAMFS_SOURCE option. An other way is to provide a configuration file to this option. I have tried all these methods but each time, the boot stops with the following message: Kernel panic - not syncing: junk in compressed archive I have googled on that but have not found relevant solution. Does anyone know what could generally be the cause of this problem? Thanks in advance for your help.