cns3xxx: eliminate hardcoded kernel/rootfs partition split

This changes the sysupgrade format. To support upgrades from the old
firmware to the new one, legacy images are provided. Because of the old
partition split, these have to be specific to the NOR or SPI device.

The new sysupgrade images are suitable for begin put on flash directly,
and they are independent of NOR vs SPI flash variant.

Flashing back to old firmware is supported via using the old full-flash
images instead of the old sysupgrade images.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

4 files changed, 36 insertions, 171 deletions

diff --git a/target/linux/cns3xxx/base-files/lib/upgrade/platform.sh b/target/linux/cns3xxx/base-files/lib/upgrade/platform.sh
index 6d94a53..4efa47d 100644
--- a/target/linux/cns3xxx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/cns3xxx/base-files/lib/upgrade/platform.sh
@@ -1,112 +1,21 @@
-. /lib/cns3xxx.sh
-
-RAMFS_COPY_DATA="/lib/cns3xxx.sh"
+PART_NAME=firmware
 
 CI_BLKSZ=65536
 
-platform_find_partitions() {
-	local first dev size erasesize name
-	while read dev size erasesize name; do
-		name=${name#'"'}; name=${name%'"'}
-		case "$name" in
-			vmlinux.bin.l7|kernel|linux|rootfs)
-				if [ -z "$first" ]; then
-					first="$name"
-				else
-					echo "$erasesize:$first:$name"
-					break
-				fi
-			;;
-		esac
-	done < /proc/mtd
-}
-
-platform_find_kernelpart() {
-	local part
-	for part in "${1%:*}" "${1#*:}"; do
-		case "$part" in
-			vmlinux.bin.l7|kernel|linux)
-				echo "$part"
-				break
-			;;
-		esac
-	done
-}
-
-platform_do_upgrade_combined() {
-	local partitions=$(platform_find_partitions)
-	local kernelpart=$(platform_find_kernelpart "${partitions#*:}")
-	local erase_size=$((0x${partitions%%:*})); partitions="${partitions#*:}"
-	local kern_length=0x$(dd if="$1" bs=2 skip=1 count=4 2>/dev/null)
-	local kern_blocks=$(($kern_length / $CI_BLKSZ))
-	local root_blocks=$((0x$(dd if="$1" bs=2 skip=5 count=4 2>/dev/null) / $CI_BLKSZ))
-
-	v "platform_do_upgrade_combined"
-	v "partitions=$partitions"
-	v "kernelpart=$kernelpart"
-	v "erase_size=$erase_size" 
-	v "kern_blocks=$kern_blocks"
-	v "root_blocks=$root_blocks"
-
-	if [ -n "$partitions" ] && [ -n "$kernelpart" ] && \
-	   [ ${kern_blocks:-0} -gt 0 ] && \
-	   [ ${root_blocks:-0} -gt 0 ] && \
-	   [ ${erase_size:-0} -gt 0 ];
-	then
-		local append=""
-		[ -f "$CONF_TAR" -a "$SAVE_CONFIG" -eq 1 ] && append="-j $CONF_TAR"
-
-		dd if="$1" bs=$CI_BLKSZ skip=1 count=$kern_blocks 2>/dev/null | mtd write - kernel
-		dd if="$1" bs=$CI_BLKSZ skip=$((1+$kern_blocks)) count=$root_blocks 2>/dev/null | \
-				 mtd -r $append write - rootfs
-	else
-		echo "invalid image"
-	fi
-}
-
 platform_check_image() {
-	local board=$(cns3xxx_board_name)
-	local magic="$(get_magic_word "$1")"
-	local magic_long="$(get_magic_long "$1")"
+	local magic="$(get_magic_long "$1")"
 
 	[ "$#" -gt 1 ] && return 1
 
-	case "$board" in
-	laguna)
-		[ "$magic" != "4349" ] && {
-			echo "Invalid image. Use *-sysupgrade.bin files on this board"
-			return 1
-		}
-
-		local md5_img=$(dd if="$1" bs=2 skip=9 count=16 2>/dev/null)
-		local md5_chk=$(dd if="$1" bs=$CI_BLKSZ skip=1 2>/dev/null | md5sum -); md5_chk="${md5_chk%% *}"
-
-		if [ -n "$md5_img" -a -n "$md5_chk" ] && [ "$md5_img" = "$md5_chk" ]; then
-			return 0
-		else
-			echo "Invalid image. Contents do not match checksum (image:$md5_img calculated:$md5_chk)"
-			return 1
-		fi
-		return 0
-		;;
-	esac
-
-	echo "Sysupgrade is not yet supported on $board."
-	return 1
+	[ "$magic" != "27051956" ] && {
+		echo "Invalid image type."
+		return 1
+	}
+	return 0
 }
 
 platform_do_upgrade() {
-	local board=$(cns3xxx_board_name)
-
-	v "board=$board"
-	case "$board" in
-	laguna)
-		platform_do_upgrade_combined "$ARGV"
-		;;
-	*)
-		default_do_upgrade "$ARGV"
-		;;
-	esac
+	default_do_upgrade "$ARGV"
 }
 
 disable_watchdog() {
diff --git a/target/linux/cns3xxx/config-4.4 b/target/linux/cns3xxx/config-4.4
index faf2606..4745f4e 100644
--- a/target/linux/cns3xxx/config-4.4
+++ b/target/linux/cns3xxx/config-4.4
@@ -47,6 +47,8 @@ CONFIG_CLKDEV_LOOKUP=y
 CONFIG_CLKSRC_OF=y
 CONFIG_CLKSRC_PROBE=y
 CONFIG_CLONE_BACKWARDS=y
+CONFIG_CMDLINE="console=ttyS0,115200"
+CONFIG_CMDLINE_FORCE=y
 CONFIG_CNS3XXX_ETH=y
 CONFIG_COMMON_CLK=y
 CONFIG_CPU_32v6=y
@@ -135,11 +137,6 @@ CONFIG_HAVE_FUNCTION_TRACER=y
 CONFIG_HAVE_GENERIC_DMA_COHERENT=y
 CONFIG_HAVE_IDE=y
 CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
-CONFIG_HAVE_KERNEL_GZIP=y
-CONFIG_HAVE_KERNEL_LZ4=y
-CONFIG_HAVE_KERNEL_LZMA=y
-CONFIG_HAVE_KERNEL_LZO=y
-CONFIG_HAVE_KERNEL_XZ=y
 CONFIG_HAVE_MEMBLOCK=y
 CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
 CONFIG_HAVE_NET_DSA=y
@@ -190,6 +187,8 @@ CONFIG_MTD_M25P80=y
 CONFIG_MTD_PHYSMAP=y
 # CONFIG_MTD_PHYSMAP_OF is not set
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPLIT_FIRMWARE=y
+CONFIG_MTD_SPLIT_UIMAGE_FW=y
 CONFIG_MULTI_IRQ_HANDLER=y
 CONFIG_MUTEX_SPIN_ON_OWNER=y
 CONFIG_NEED_DMA_MAP_STATE=y
diff --git a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c
index 664492a..5df69f3 100644
--- a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c
+++ b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c
@@ -122,13 +122,8 @@ static struct mtd_partition laguna_nor_partitions[] = {
 		.size		= SZ_128K,
 		.offset		= SZ_256K,
 	}, {
-		.name		= "kernel",
-		.size		= SZ_2M,
+		.name		= "firmware",
 		.offset		= SZ_256K + SZ_128K,
-	}, {
-		.name		= "rootfs",
-		.size		= SZ_16M - SZ_256K - SZ_128K - SZ_2M,
-		.offset		= SZ_256K + SZ_128K + SZ_2M,
 	},
 };
 
@@ -168,13 +163,8 @@ static struct mtd_partition laguna_spi_partitions[] = {
 		.size		= SZ_256K,
 		.offset		= SZ_256K,
 	}, {
-		.name		= "kernel",
-		.size		= SZ_1M + SZ_512K,
+		.name		= "firmware",
 		.offset		= SZ_512K,
-	}, {
-		.name		= "rootfs",
-		.size		= SZ_16M - SZ_2M,
-		.offset		= SZ_2M,
 	},
 };
 
@@ -1017,49 +1007,19 @@ static int __init laguna_model_setup(void)
 		platform_device_register(&laguna_uart);
 
 		if (laguna_info.config2_bitmap & (NOR_FLASH_LOAD)) {
-			switch (laguna_info.nor_flash_size) {
-				case 1:
-					laguna_nor_partitions[3].size = SZ_8M - SZ_256K - SZ_128K - SZ_2M;
-					laguna_nor_res.end = CNS3XXX_FLASH_BASE + SZ_8M - 1;
-				break;
-				case 2:
-					laguna_nor_partitions[3].size = SZ_16M - SZ_256K - SZ_128K - SZ_2M;
-					laguna_nor_res.end = CNS3XXX_FLASH_BASE + SZ_16M - 1;
-				break;
-				case 3:
-					laguna_nor_partitions[3].size = SZ_32M - SZ_256K - SZ_128K - SZ_2M;
-					laguna_nor_res.end = CNS3XXX_FLASH_BASE + SZ_32M - 1;
-				break;
-				case 4:
-					laguna_nor_partitions[3].size = SZ_64M - SZ_256K - SZ_128K - SZ_2M;
-					laguna_nor_res.end = CNS3XXX_FLASH_BASE + SZ_64M - 1;
-				break;
-				case 5:
-					laguna_nor_partitions[3].size = SZ_128M - SZ_256K - SZ_128K - SZ_2M;
-					laguna_nor_res.end = CNS3XXX_FLASH_BASE + SZ_128M - 1;
-				break;
-			}
+			laguna_nor_partitions[2].size =
+				(SZ_4M << laguna_info.nor_flash_size) -
+				laguna_nor_partitions[2].offset;
+			laguna_nor_res.end = CNS3XXX_FLASH_BASE +
+				laguna_nor_partitions[2].offset +
+				laguna_nor_partitions[2].size - 1;
 			platform_device_register(&laguna_nor_pdev);
 		}
 
 		if (laguna_info.config2_bitmap & (SPI_FLASH_LOAD)) {
-			switch (laguna_info.spi_flash_size) {
-				case 1:
-					laguna_spi_partitions[3].size = SZ_4M - SZ_2M;
-				break;
-				case 2:
-					laguna_spi_partitions[3].size = SZ_8M - SZ_2M;
-				break;
-				case 3:
-					laguna_spi_partitions[3].size = SZ_16M - SZ_2M;
-				break;
-				case 4:
-					laguna_spi_partitions[3].size = SZ_32M - SZ_2M;
-				break;
-				case 5:
-					laguna_spi_partitions[3].size = SZ_64M - SZ_2M;
-				break;
-			}
+			laguna_spi_partitions[2].size =
+				(SZ_2M << laguna_info.spi_flash_size) -
+				laguna_spi_partitions[2].offset;
 			spi_register_board_info(ARRAY_AND_SIZE(laguna_spi_devices));
 		}
 
diff --git a/target/linux/cns3xxx/image/Makefile b/target/linux/cns3xxx/image/Makefile
index 8f29c6c..99bb7f1 100644
--- a/target/linux/cns3xxx/image/Makefile
+++ b/target/linux/cns3xxx/image/Makefile
@@ -11,14 +11,19 @@ define Image/Prepare
 	mkimage -A arm -O linux -T kernel -C none -a 0x20008000 -e 0x20008000 -n 'OpenWrt Linux-$(LINUX_VERSION)' -d $(KDIR)/zImage $(KDIR)/uImage
 endef
 
+LEGACY_NOR_KERNEL_SIZE = 2048k
+LEGACY_SPI_KERNEL_SIZE = 1536k
+
 # Build sysupgrade image
-define BuildFirmware/Generic
-	dd if=$(KDIR)/uImage of=$(KDIR)/uImage.pad bs=64k conv=sync; \
-	dd if=$(KDIR)/root.$(1) of=$(KDIR)/root.$(1).pad bs=128k conv=sync; \
+define BuildFirmware/Legacy
+	dd if=$(BIN_DIR)/$(IMG_PREFIX)-$(1)-sysupgrade.bin \
+		of=$(KDIR)/uImage.pad bs=$(3) count=1
+	dd if=$(BIN_DIR)/$(IMG_PREFIX)-$(1)-sysupgrade.bin \
+		of=$(KDIR)/root.$(1).pad bs=$(3) skip=1
 	sh $(TOPDIR)/scripts/combined-image.sh \
 		$(KDIR)/uImage.pad \
 		$(KDIR)/root.$(1).pad \
-		$(BIN_DIR)/$(IMG_PREFIX)-$(patsubst jffs2-%,jffs2,$(patsubst squashfs-%,squashfs,$(1)))-sysupgrade.bin
+		$(BIN_DIR)/$(IMG_PREFIX)-$(1)-$(2)-legacy-sysupgrade.bin
 endef
 
 define Image/BuildKernel/Initramfs
@@ -26,22 +31,14 @@ define Image/BuildKernel/Initramfs
 endef
 
 define Image/Build
+	cat $(KDIR)/uImage $(KDIR)/root.$(1) > $(BIN_DIR)/$(IMG_PREFIX)-$(1)-sysupgrade.bin
 	$(call Image/Build/$(1),$(1))
-	$(call BuildFirmware/Generic,$(1))
-	cp $(KDIR)/uImage $(BIN_DIR)/$(IMG_PREFIX)-uImage
+	$(call BuildFirmware/Legacy,$(1),laguna_spi,$(LEGACY_SPI_KERNEL_SIZE))
+	$(call BuildFirmware/Legacy,$(1),laguna_nor,$(LEGACY_NOR_KERNEL_SIZE))
 endef
 
 define Image/Build/squashfs
-	$(call prepare_generic_squashfs,$(KDIR)/root.$(1))
-	dd if=$(KDIR)/root.$(1) of=$(BIN_DIR)/$(IMG_PREFIX)-$(1).img bs=128k conv=sync
-	( \
-	dd if=$(KDIR)/uImage bs=2048k conv=sync; \
-	dd if=$(KDIR)/root.$(1) bs=128k conv=sync; \
-	) > $(BIN_DIR)/$(IMG_PREFIX)-$(1)_laguna_nor.bin
-	( \
-	dd if=$(KDIR)/uImage bs=1536k conv=sync; \
-	dd if=$(KDIR)/root.$(1) bs=256k conv=sync; \
-	) > $(BIN_DIR)/$(IMG_PREFIX)-$(1)_laguna_spi.bin
+	$(call prepare_generic_squashfs,$(BIN_DIR)/$(IMG_PREFIX)-$(1)-sysupgrade.bin)
 endef
 
 $(eval $(call BuildImage))