about btrfs in RPI

i try to use ssd and btrfs as root system boot my RPI.
finally,kernel panic,warning message is unknown block.
i think maybe btrfs not buid in cur kernel....
who can give me a definite answer?

thanks all.

i see btrfs.ko not in https://github.com/raspberrypi/firmware ... es.builtin

i want know how to build a new kernel img.

i will try
http://www.elinux.org/RPi_Kernel_Compilation

Hi, I enabled the btrfs support and initrd support, compiled the kernel according to http://www.elinux.org/RPi_Kernel_Compilation, but I dont know, how to generate initrd.img without booting into raspbian.

Can you help me, please?

You shouldn't need initrd just the kernel modules and kernel image. Why don't you build btrfs using dkms ?

You shouldn't need initrd just the kernel modules and kernel image. Why don't you build btrfs using dkms ?

I want to use BTRFS for my root filesystem. To be able to mount the btrfs root file system, i need the btrfs driver. And when the driver is somewhere in /lib/modules, i can't mount root because i can't load the btrfs driver.

That is my idea. I am not sure whatever DKMS can help me. If i made some mistakes, please correct me, i am a kernel newbie...

or can you give me a concrete advice, how can i get btrfs root on RPI?

You can skip the initramdisk entirely and just compile btrfs support in (ie. not a module).

Either edit your .config file or run
./scripts/config -e CONFIG_BTRFS_FS

Additionally, it's needed to update the entry in /etc/fstab and change the rootfstype to btrfs in bootloader config.