image_types_fsl.bbclass: add imx-bootlets support for i.MXS

i.MXS SoC family has support to boot with imx-bootlets (the default
when using LTIB) and the only current supported way of booting i.MX23
machines.

The imx-bootlets has some quite specific requirements regaring the
partition layout and includes the kernel binary appended to the boot
stream so we drop the third partition reducing the wasted space of SD
card.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

1 files changed, 48 insertions, 20 deletions

diff --git a/classes/image_types_fsl.bbclass b/classes/image_types_fsl.bbclass
index 6877243..8b184f2 100644
--- a/classes/image_types_fsl.bbclass
+++ b/classes/image_types_fsl.bbclass
@@ -11,6 +11,12 @@ UBOOT_SUFFIX_SDCARD ?= "${UBOOT_SUFFIX}"
 # Handles i.MX mxs bootstream generation
 #
 
+# IMX Bootlets Linux bootstream
+IMAGE_DEPENDS_linux.sb = "elftosb-native imx-bootlets virtual/kernel"
+IMAGE_CMD_linux.sb = "(cd ${DEPLOY_DIR_IMAGE} ; elftosb -z -c imx-bootlets-linux_prebuilt.db-${MACHINE} \
+                                                        -o ${IMAGE_NAME}.linux.sb)"
+
+# U-Boot mxsboot generation to SD-Card
 UBOOT_SUFFIX_SDCARD_mxs ?= "mxsboot-sdcard"
 IMAGE_DEPENDS_uboot.mxsboot-sdcard = "u-boot-mxsboot-native u-boot"
 IMAGE_CMD_uboot.mxsboot-sdcard = "mxsboot sd ${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.${UBOOT_SUFFIX} \
@@ -57,6 +63,10 @@ generate_imx_sdcard () {
         parted ${SDCARD} print
 
         case "${IMAGE_BOOTLOADER}" in
+                imx-bootlets)
+                bberror "The imx-bootlets is not supported for i.MX based machines"
+                exit 1
+                ;;
                 u-boot)
                 dd if=${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.${UBOOT_SUFFIX_SDCARD} of=${SDCARD} conv=notrunc seek=2 skip=${UBOOT_PADDING} bs=512
                 ;;
@@ -85,29 +95,47 @@ generate_imx_sdcard () {
 #
 # External variables needed:
 #   ${SDCARD_ROOTFS}    - the rootfs image to incorporate
-#   ${IMAGE_BOOTLOADER} - bootloader to use {u-boot, barebox}
-#
-# The disk layout used is:
-#
-#    1M - 2M                  - reserved to bootloader and other data
-#    2M - BOOT_SPACE          - kernel
-#    BOOT_SPACE - SDCARD_SIZE - rootfs
+#   ${IMAGE_BOOTLOADER} - bootloader to use {imx-bootlets, u-boot}
 #
 generate_mxs_sdcard () {
         # Create partition table
         parted -s ${SDCARD} mklabel msdos
-        parted -s ${SDCARD} mkpart primary 1MiB 2MiB
-        parted -s ${SDCARD} mkpart primary 2MiB ${BOOT_SPACE}
-        parted -s ${SDCARD} mkpart primary ${BOOT_SPACE} 100%
-        parted ${SDCARD} print
-
-        # Change partition type for mxs processor family
-        bbnote "Setting partition type to 0x53 as required for mxs' SoC family."
-        echo -n S | dd of=${SDCARD} bs=1 count=1 seek=450 conv=notrunc
 
         case "${IMAGE_BOOTLOADER}" in
+                imx-bootlets)
+                # The disk layout used is:
+                #
+                #    1M - BOOT_SPACE          - kernel
+                #    BOOT_SPACE - SDCARD_SIZE - rootfs
+                #
+                parted -s ${SDCARD} mkpart primary 1MiB ${BOOT_SPACE}
+                parted -s ${SDCARD} mkpart primary ${BOOT_SPACE} 100%
+
+                # Empty 4 bytes from boot partition
+                dd if=/dev/zero of=${SDCARD} conv=notrunc seek=2048 count=4
+
+                # Write the bootstream in (2048 + 4) bytes
+                dd if=${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.linux.sb of=${SDCARD} conv=notrunc seek=1 seek=2052
+                ;;
                 u-boot)
+                # The disk layout used is:
+                #
+                #    1M - 2M                  - reserved to bootloader and other data
+                #    2M - BOOT_SPACE          - kernel
+                #    BOOT_SPACE - SDCARD_SIZE - rootfs
+                #
+                parted -s ${SDCARD} mkpart primary 1MiB 2MiB
+                parted -s ${SDCARD} mkpart primary 2MiB ${BOOT_SPACE}
+                parted -s ${SDCARD} mkpart primary ${BOOT_SPACE} 100%
+
                 dd if=${DEPLOY_DIR_IMAGE}/u-boot-${MACHINE}.${UBOOT_SUFFIX_SDCARD} of=${SDCARD} conv=notrunc seek=1 skip=${UBOOT_PADDING} bs=1MiB
+                BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDCARD} unit b print \
+                | awk '/ 2 / { print substr($4, 1, length($4 -1)) / 1024 }')
+
+                mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
+                mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/uImage-${MACHINE}.bin ::/uImage
+
+                dd if=${WORKDIR}/boot.img of=${SDCARD} conv=notrunc seek=2 bs=1MiB
                 ;;
                 *)
                 bberror "Unkown IMAGE_BOOTLOADER value"
@@ -115,12 +143,12 @@ generate_mxs_sdcard () {
                 ;;
         esac
 
-        BOOT_BLOCKS=$(LC_ALL=C parted -s ${SDCARD} unit b print \
-                          | awk '/ 2 / { print substr($4, 1, length($4 -1)) / 1024 }')
-        mkfs.vfat -n "${BOOTDD_VOLUME_ID}" -S 512 -C ${WORKDIR}/boot.img $BOOT_BLOCKS
-        mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/uImage-${MACHINE}.bin ::/uImage
+        # Change partition type for mxs processor family
+        bbnote "Setting partition type to 0x53 as required for mxs' SoC family."
+        echo -n S | dd of=${SDCARD} bs=1 count=1 seek=450 conv=notrunc
+
+        parted ${SDCARD} print
 
-        dd if=${WORKDIR}/boot.img of=${SDCARD} conv=notrunc seek=2 bs=1MiB
         dd if=${SDCARD_ROOTFS} of=${SDCARD} conv=notrunc seek=1 bs=${BOOT_SPACE}
 }