add initramfs recipe

conf/layer.conf

@@ -14,7 +14,7 @@ LAYERSERIES_COMPAT_meta-rpi-diya = "mickledore"
 
 PACKAGE_CLASSES = "package_ipk"
 
-INITRAMFS_IMAGE="core-image-tiny-initramfs"
+INITRAMFS_IMAGE="core-image-recovery"
 INITRAMFS_IMAGE_BUNDLE="0"
 
 INHERIT += "rm_work"
@@ -41,7 +41,7 @@ ENABLE_DWC2_PERIPHERAL = "1"
 ENABLE_DWC2_HOST = "1"
 ENABLE_USB_U_BOOT = "0"
 
-ENABLE_UART = "1"
+ENABLE_UART = "0"
 
 DISABLE_SPLASH = "1"
 VIDEO_CAMERA = "1"

recipes-core/images/core-image-minimal.bbappend

@@ -12,7 +12,7 @@ EXTRA_USERS_PARAMS = "usermod -p 2Pe/4xyFxsokE diya; \
                         usermod -a -G avahi diya; \
                         usermod -a -G sudo diya \
                         "
-IMAGE_BOOT_FILES:append = "fs_resize core-image-tiny-initramfs-${MACHINE}.cpio.gz "
+IMAGE_BOOT_FILES:append = "fs_resize core-image-recovery-${MACHINE}.cpio.gz "
 
 IMAGE_INSTALL:append = "libcurl \
                         libdrm \

recipes-core/images/core-image-recovery.bb

@@ -0,0 +1,33 @@
+
+DESCRIPTION = "Recovery initramfs image."
+
+
+PACKAGE_INSTALL = "busybox ${VIRTUAL-RUNTIME_base-utils} udev base-passwd ${ROOTFS_BOOTSTRAP_INSTALL}"
+
+# Do not pollute the initrd image with rootfs features
+IMAGE_FEATURES = ""
+
+export IMAGE_BASENAME = "${MLPREFIX}core-image-recovery"
+IMAGE_NAME_SUFFIX ?= ""
+IMAGE_LINGUAS = ""
+
+LICENSE = "MIT"
+
+IMAGE_FSTYPES = "${INITRAMFS_FSTYPES}"
+inherit core-image
+
+IMAGE_ROOTFS_SIZE = "8192"
+IMAGE_ROOTFS_EXTRA_SPACE = "0"
+
+# Use the same restriction as initramfs-module-install
+COMPATIBLE_HOST = '(x86_64.*|i.86.*|arm.*|aarch64.*)-(linux.*|freebsd.*)'
+
+
+python tinyinitrd () {
+  # Modify our init file so the user knows we drop to shell prompt on purpose
+  newinit = "/bin/busybox sh init"
+  with open(d.expand('${IMAGE_ROOTFS}/init'), 'w') as init:
+    init.write(newinit)
+}
+
+IMAGE_PREPROCESS_COMMAND += "tinyinitrd;"