brcm2708: boot-part feature integration

This patch adds the boot-part feature which enables the brcm2708
target move from the custom boot partition size config option to
the generic CONFIG_TARGET_KERNEL_PARTSIZE.

Note:
For people using custom images: Just like with
CONFIG_TARGET_ROOTFS_PARTSIZE changing the value
can cause sysupgrade to repartition the device!
Make sure to have a backup in this case.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

config/Config-images.in

@@ -270,6 +270,7 @@ menu "Target Images"
 		int "Kernel partition size (in MB)"
 		depends on GRUB_IMAGES || USES_BOOT_PART
 		default 8 if TARGET_apm821xx_sata
+		default 20 if TARGET_brcm2708
 		default 16
 
 	config TARGET_ROOTFS_PARTSIZE

target/linux/brcm2708/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=brcm2708
 BOARDNAME:=Broadcom BCM27xx
-FEATURES:=ext4 audio usb usbgadget display gpio fpu squashfs rootfs-part
+FEATURES:=ext4 audio usb usbgadget display gpio fpu squashfs rootfs-part boot-part
 MAINTAINER:=Álvaro Fernández Rojas <noltari@gmail.com>
 SUBTARGETS:=bcm2708 bcm2709 bcm2710
 

target/linux/brcm2708/image/Config.in

-config BRCM2708_SD_BOOT_PARTSIZE
-	int "Boot (SD Card) filesystem partition size (in MB)"
-	depends on TARGET_brcm2708
-	default 20
-

target/linux/brcm2708/image/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/image.mk
 
 FAT32_BLOCK_SIZE=1024
-FAT32_BLOCKS=$(shell echo $$(($(CONFIG_BRCM2708_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
+FAT32_BLOCKS=$(shell echo $$(($(CONFIG_TARGET_KERNEL_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
 
 define Build/Compile
 	$(CP) $(LINUX_DIR)/COPYING $(KDIR)/COPYING.linux
@@ -44,7 +44,7 @@ endef
 
 define Build/sdcard-img
 	./gen_rpi_sdcard_img.sh $@ $@.boot $(IMAGE_ROOTFS) \
-		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
+		$(CONFIG_TARGET_KERNEL_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
 endef
 
 ### Devices ###