ar71xx: Add support for ZyXEL NBG6616.

Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net>

SVN-Revision: 47405

1 files changed, 33 insertions, 0 deletions

diff --git a/target/linux/ar71xx/image/Makefile b/target/linux/ar71xx/image/Makefile
index 15cf2c6..29e5064 100644
--- a/target/linux/ar71xx/image/Makefile
+++ b/target/linux/ar71xx/image/Makefile
@@ -2055,6 +2055,39 @@ ifdef CONFIG_PACKAGE_uboot-ar71xx-nbg460n_550n_550nh
   endef
 endif
 
+define Device/NBG6616
+	BOARDNAME = NBG6616
+	KERNEL_SIZE = 2048k
+	IMAGE_SIZE = 15323k
+	MTDPARTS = spi0.0:192k(u-boot)ro,64k(env)ro,64k(RFdata)ro,384k(zyxel_rfsd),384k(romd),64k(header),2048k(kernel),13184k(rootfs),15232k@0x120000(firmware)
+	CMDLINE += mem=128M
+	IMAGES := sysupgrade.bin
+	KERNEL := kernel-bin | patch-cmdline | lzma | uImage lzma | jffs2 boot/vmlinux.lzma.uImage
+	IMAGE/sysupgrade.bin = append-kernel $$$$(KERNEL_SIZE) | append-rootfs | pad-rootfs | check-size $$$$(IMAGE_SIZE)
+	# We cannot currently build a factory image. It is the sysupgrade image
+	# prefixed with a header (which is actually written into the MTD device).
+	# The header is 2kiB and is filled with 0xff. The format seems to be:
+	#   2 bytes:  0x0000
+	#   2 bytes:  checksum of the data partition (big endian)
+	#   4 bytes:  length of the contained image file (big endian)
+	#  32 bytes:  Firmware Version string (NUL terminated, 0xff padded)
+	#   2 bytes:  0x0000
+	#   2 bytes:  checksum over the header partition (big endian)
+	#  32 bytes:  Model (e.g. "NBG6616", NUL termiated, 0xff padded)
+	#      rest: 0xff padding
+	#
+	# The checksums are calculated by adding up all bytes and if a 16bit
+	# overflow occurs, one is added and the sum is masked to 16 bit:
+	#   csum = csum + databyte; if (csum > 0xffff) { csum += 1; csum &= 0xffff };
+	# Should the file have an odd number of bytes then the byte len-0x800 is
+	# used additionally.
+	# The checksum for the header is calcualted over the first 2048 bytes with
+	# the firmware checksum as the placeholder during calculation.
+	#
+	# The header is padded with 0xff to the erase block size of the device.
+endef
+
+TARGET_DEVICES += NBG6616
 
 define	Image/Build/ZyXELNAND/buildkernel
 	$(eval kernelsize=$(call mtdpartsize,kernel,$(5)))