[PATCH v2 2/2] ath79: airtight c-75: use second flash chip

[Tomasz Maciej Nowak]

The flash capacity is divided in two flash chips and currently only
first is used. Increase available space for OpenWrt by additional 16 MiB
using mtd-concat driver. Because U-Boot might not be able to load kernel
image spanned through two flash chips, the size of kernel is limited
to space available on first chip.

Cc: Vladimir Georgievsky <vladimir.georgievsky at yahoo.com>
Signed-off-by: Tomasz Maciej Nowak <tmn505 at gmail.com>
---
v1 -> v2

- add kernel size constraints

 .../linux/ath79/dts/qca9550_airtight_c-75.dts | 24 +++++++++++++++----
 target/linux/ath79/image/generic.mk           |  3 ++-
 2 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/target/linux/ath79/dts/qca9550_airtight_c-75.dts b/target/linux/ath79/dts/qca9550_airtight_c-75.dts
index 34d4c32b3562..c380a109c96b 100644
--- a/target/linux/ath79/dts/qca9550_airtight_c-75.dts
+++ b/target/linux/ath79/dts/qca9550_airtight_c-75.dts
@@ -41,6 +41,23 @@
 			linux,default-trigger = "phy1tpt";
 		};
 	};
+
+	mtd-concat {
+		compatible = "mtd-concat";
+		devices = <&concat0 &concat1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition at 0 {
+				label = "firmware";
+				reg = <0x0 0x1f90000>;
+				compatible = "denx,uimage";
+			};
+		};
+	};
 };
 
 &eth0 {
@@ -120,10 +137,8 @@
 				read-only;
 			};
 
-			partition at 60000 {
-				label = "firmware";
+			concat0: partition at 60000 {
 				reg = <0x060000 0xf90000>;
-				compatible = "denx,uimage";
 			};
 
 			art: partition at ff0000 {
@@ -144,8 +159,7 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			partition at 0 {
-				label = "opt";
+			concat1: partition at 0 {
 				reg = <0x0 0x1000000>;
 			};
 		};
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 177caafa2253..bdc35823c66c 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -246,7 +246,8 @@ define Device/airtight_c-75
   DEVICE_ALT1_VENDOR := WatchGuard
   DEVICE_ALT1_MODEL := AP320
   DEVICE_PACKAGES := ath10k-firmware-qca988x kmod-ath10k-ct kmod-usb2
-  IMAGE_SIZE := 15936k
+  IMAGE_SIZE := 32320k
+  KERNEL_SIZE := 15936k
 endef
 TARGET_DEVICES += airtight_c-75
 
-- 
2.29.2