avr32: optimize image generation

- remove the kernel+rootfs partitions from the MTD partition map,
 - use a temporary directory for intermediate image files,
 - append the root squashfs directly to the kernel,
 - don't hardcode uImage size in the jffs2 images,

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 38194

target/linux/avr32/patches-3.10/110-openwrt_flashmap.patch

@@ -1,31 +1,11 @@
 --- a/arch/avr32/boards/atngw100/flash.c
 +++ b/arch/avr32/boards/atngw100/flash.c
-@@ -45,9 +45,14 @@ static struct mtd_partition flash_parts[
+@@ -45,7 +45,7 @@ static struct mtd_partition flash_parts[
  		.mask_flags     = MTD_WRITEABLE,
  	},
  	{
 -		.name           = "root",
-+		.name           = "kernel",
- 		.offset         = 0x00020000,
--		.size           = 0x007d0000,
-+		.size           = 0x00100000,
-+	},
-+	{
-+		.name           = "rootfs",
-+		.offset         = 0x00120000,
-+		.size           = 0x006d0000,
- 	},
- 	{
- 		.name           = "env",
-@@ -55,6 +60,11 @@ static struct mtd_partition flash_parts[
- 		.size           = 0x00010000,
- 		.mask_flags     = MTD_WRITEABLE,
- 	},
-+	{
 +		.name           = "firmware",
-+		.offset         = 0x00020000,
-+		.size           = 0x007d0000,
-+	},
- };
- 
- static struct physmap_flash_data flash_data = {
+ 		.offset         = 0x00020000,
+ 		.size           = 0x007d0000,
+ 	},