ipq40xx: add support for Linksys EA6350v3

Specifications:
SOC: Qualcomm IPQ4018
RAM: 256 MiB Samsung K4B2G1646F-BYK0
FLASH1: MX25L1605D 2 MB
FLASH2: Winbond W25N01GV 128Mb
ETH: Qualcomm QCA8075
WLAN0: Qualcomm Atheros QCA4018 2.4GHz 802.11b/g/n 2x2
WLAN1: Qualcomm Atheros QCA4018 5GHz 802.11n/ac W2 2x2
INPUT: WPS, Reset
LED: Status - Green
SERIAL: Header at J19, Beneath DC Power Jack
        1-VCC ; 2-TX ; 3-RX; 4-GND;
        Serial 115200-8-N-1.

Tested and working:
- USB (requires extra packages)
- LAN Ethernet (Correct MAC-address)
- WAN Ethernet (Correct MAC-address)
- 2.4 GHz WiFi (Correct MAC-address)
- 5 GHz WiFi (Correct MAC-address)
- Factory installation from Web UI
- OpenWRT sysupgrade
- LED
- Reset Button

Need Testing:
- WPS button

Install via Web UI:
- Attach to a LAN port on the router.
- Connect to the Linksys Smart WiFi Page (default 192.168.1.1) and login
- Select the connectivity tab on the left
- In the manual update box on the right
- Select browse, and browse to
  openwrt-ipq40xx-linksys_ea6350v3-squashfs-factory.bin
- Click update.
- Read and accept the warning
- The router LED will start blinking. When the router LED goes solid, you
  can now navigate to 192.168.1.1 to your new OpenWrt installation.

Sysupgrade:
- Flash the sysupgrade image as usual. Please: try to do a reset everytime
  you can (doing it with LuCI is easy and can be done in the same step).

Recovery (Automatic):
- If the device fails to boot after install or upgrade, whilst the unit is
  turned on:
1 - Wait 15 seconds
2 - Switch Off and Wait 10 seconds
3 - Switch on
4 - Repeat steps 1 to 3, 3 times then go to 5.
5 - U-boot will have now erased the failed update and switched back to the
    last working firmware - you should be able to access your router on
    LAN.

Recovery (Manual):
- The steps for manual recovery are the same as the generic u-boot tftp
  client method.

Back To Stock:
- Use the generic recovery using the tftp client method to flash the
  "civic.img". Also you can strip-and-pad the original image and use
  the generic "mtd" method by flashing over the "kernel" partition.
* Just be careful to flash in the partition that the device is currently
  booted.

Signed-off-by: Ryan Pannell <ryan@osukl.com>
Signed-off-by: Oever González <notengobattery@gmail.com>
[minor edits, removed second compatible of nand, added dtb entry to 4.19]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/image/Makefile b/target/linux/ipq40xx/image/Makefile
index 629a5ef48c..a670380ab3 100644
--- a/target/linux/ipq40xx/image/Makefile
+++ b/target/linux/ipq40xx/image/Makefile
@@ -26,6 +26,12 @@ define Device/FitImageLzma
 	KERNEL_NAME := Image
 endef
 
+define Device/FitzImage
+	KERNEL_SUFFIX := -fit-zImage.itb
+	KERNEL = kernel-bin | fit none $$(DTS_DIR)/$$(DEVICE_DTS).dtb
+	KERNEL_NAME := zImage
+endef
+
 define Device/UbiFit
 	KERNEL_IN_UBI := 1
 	IMAGES := nand-factory.ubi nand-sysupgrade.bin
@@ -131,6 +137,41 @@ define Device/glinet_gl-b1300
 endef
 TARGET_DEVICES += glinet_gl-b1300
 
+define Device/linksys_ea6350v3
+	# The Linksys EA6350v3 has a uboot bootloader that does not
+	# support either booting lzma kernel images nor booting UBI
+	# partitions. This uboot, however, supports raw kernel images and
+	# gzipped images.
+	#
+	# As for the time of writing this, the device will boot the kernel
+	# from a fixed address with a fixed length of 3MiB. Also, the
+	# device has a hard-coded kernel command line that requieres the
+	# rootfs and alt_rootfs to be in mtd11 and mtd13 respectively.
+	# Oh... and the kernel partition overlaps with the rootfs
+	# partition (the same for alt_kernel and alt_rootfs).
+	#
+	# If you are planing re-partitioning the device, you may want to
+	# keep those details in mind:
+	# 1. The kernel adresses you should honor are 0x00000000 and
+	#    0x02800000 respectively.
+	# 2. The kernel size (plus the dtb) cannot exceed 3.00MiB in size.
+	# 3. You can use 'zImage', but not a raw 'Image' packed with lzma.
+	# 4. The kernel command line from uboot is harcoded to boot with
+	#    rootfs either in mtd11 or mtd13.
+	$(call Device/FitzImage)
+	DEVICE_TITLE := Linksys EA6350v3
+	DEVICE_DTS := qcom-ipq4018-ea6350v3
+	BLOCKSIZE := 128k
+	PAGESIZE := 2048
+	KERNEL_SIZE := 3145728
+	IMAGE_SIZE := 38797312
+	UBINIZE_OPTS := -E 5
+	IMAGES := factory.bin sysupgrade.bin
+	IMAGE/factory.bin := append-kernel | append-uImage-fakehdr filesystem | pad-to $$$${KERNEL_SIZE} | append-ubi | linksys-image type=EA6350v3
+	DEVICE_PACKAGES := ipq-wifi-linksys_ea6350v3 uboot-envtools
+endef
+TARGET_DEVICES += linksys_ea6350v3
+
 define Device/meraki_mr33
 	$(call Device/FitImage)
 	DEVICE_DTS := qcom-ipq4029-mr33