mediatek: mt7623: make gen_banana_pi_img.sh more generic

This actually covers fairly much all the MediaTek platforms; they
only have different images because they don't include the preloader
and U-Boot, and rely on preinstalled stuff from the vendor.

So this script can slowly take over the world as we complete the
support for various other platforms, starting with UniElec U7623…

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

target/linux/mediatek/image/gen_banana_pi_img.sh

@@ -79,7 +79,7 @@
 # with the preloader loading 512KiB of U-Boot starting at 0x50000.
 
 usage() {
-    echo "SYNTAX: $0 sd <file> <preloader image> <u-boot image> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
+    echo "SYNTAX: $0 sd <file> <preloader image> <u-boot image> <u-boot offset> <bootfs image> <rootfs image> <bootfs size> <rootfs size>"
     echo " OR:    $0 emmc <file> <preloader image>"
     exit 1
 }
@@ -96,20 +96,21 @@ BRLYT="BRLYT\x00\x00\x00\x01\x00\x00\x00\x00\x08\x00\x00\
 
 case $1 in
  sd)
-	[ $# -eq 8 ] || usage
+	[ $# -eq 9 ] || usage
 	OUTPUT="$2"
 	PRELOADER="$3"
 	UBOOT="$4"
-	BOOTFS="$5"
-	ROOTFS="$6"
-	BOOTFSSIZE="$7"
-	ROOTFSSIZE="$8"
+	UBOOTOFS="$5"
+	BOOTFS="$6"
+	ROOTFS="$7"
+	BOOTFSSIZE="$8"
+	ROOTFSSIZE="$9"
 
 	head=4
 	sect=63
 
 	set $(ptgen -o $OUTPUT -h $head -s $sect -a 0 -l 1024 \
-		    -t 41 -p 512k@320k \
+		    -t 41 -p 512k@${UBOOTOFS} \
 		    -t c -p ${BOOTFSSIZE}M \
 		    -t 83 -p ${ROOTFSSIZE}M )
 
@@ -123,7 +124,11 @@ case $1 in
 	echo -en "${SDMMC_BOOT}" | dd bs=1 of="${OUTPUT}" seek=0   conv=notrunc
 	echo -en "${BRLYT}"      | dd bs=1 of="${OUTPUT}" seek=512 conv=notrunc
 
-	dd bs=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv=notrunc
+	# For eMMC-only boards like U7623 the preloader doesn't need to be included in the
+	# main image as it's only ever needed in the eMMC boot partition.
+	if [ -r ${PRELOADER} ]; then
+	    dd bs=1024 if="${PRELOADER}" of="${OUTPUT}" seek="${PRELOADER_OFFSET}" conv=notrunc
+	fi
 	dd bs=512  if="${UBOOT}"     of="${OUTPUT}" seek="${UBOOT_OFFSET}"     conv=notrunc
 	dd bs=512  if="${BOOTFS}"    of="${OUTPUT}" seek="${BOOTFS_OFFSET}"    conv=notrunc
 	dd bs=512  if="${ROOTFS}"    of="${OUTPUT}" seek="${ROOTFS_OFFSET}"    conv=notrunc

target/linux/mediatek/image/mt7623.mk

@@ -1,5 +1,5 @@
 KERNEL_LOADADDR := 0x80008000
-DEVICE_VARS += UBOOT_TARGET
+DEVICE_VARS += UBOOT_TARGET UBOOT_OFFSET UBOOT_ENVSIZE
 
 ifneq ($(CONFIG_BANANA_PI_BOOT_PARTSIZE),)
 BOOTFS_BLOCK_SIZE := 1024
@@ -10,16 +10,18 @@ define Build/banana-pi-sdcard
 	rm -f $@.boot
 	mkfs.fat -C $@.boot $(BOOTFS_BLOCKS)
 
-	./gen_banana_pi_img.sh emmc $@.emmc \
-		$(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin
-
-	mkenvimage -s 0x2000 -o $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-uboot.env $(UBOOT_TARGET)-uEnv.txt
+	if [ -r $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin ]; then \
+		./gen_banana_pi_img.sh emmc $@.emmc \
+			$(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin; \
+		mcopy -i $@.boot $@.emmc ::eMMCboot.bin; \
+	fi
+	mkenvimage -s $(UBOOT_ENVSIZE) -o $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-uboot.env $(UBOOT_TARGET)-uEnv.txt
 	mcopy -i $@.boot $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-uboot.env ::uboot.env
 	mcopy -i $@.boot $(IMAGE_KERNEL) ::uImage
-	mcopy -i $@.boot $@.emmc ::eMMCboot.bin
 	./gen_banana_pi_img.sh sd $@ \
 		$(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin \
-		$(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-u-boot.bin \
+		$(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-u-boot*.bin \
+		$(UBOOT_OFFSET) \
 		$@.boot \
 		$(IMAGE_ROOTFS) \
 		$(CONFIG_BANANA_PI_BOOT_PARTSIZE) \
@@ -41,6 +43,8 @@ define Device/bpi_bananapi-r2
   DEVICE_DTS := mt7623n-bananapi-bpi-r2
   DEVICE_PACKAGES := kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 kmod-mmc \
 	mkf2fs e2fsprogs kmod-usb-ohci kmod-usb2 kmod-usb3 kmod-ata-ahci-mtk
+  UBOOT_ENVSIZE := 0x2000
+  UBOOT_OFFSET := 320k
   UBOOT_TARGET := mt7623n_bpir2
   IMAGES := img.gz
   IMAGE/img.gz := banana-pi-sdcard | gzip | append-metadata