Have buildroot build the cramfs image

buildrootconfig

@@ -35,6 +35,7 @@ BR2_PACKAGE_WPA_SUPPLICANT_CLI=y
 BR2_PACKAGE_WPA_SUPPLICANT_PASSPHRASE=y
 BR2_PACKAGE_BASH=y
 BR2_PACKAGE_NANO=y
+BR2_TARGET_ROOTFS_CRAMFS=y
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
 BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="http://n900.quitesimple.org/rescueOS/sourcecode/kernel_source.tar.gz"

howtocreate

@@ -1 +0,0 @@
-/sbin/mkfs.cramfs -b 4096 -n n900rescueinitrd rinitrd/ initrd.img