kirkwood: add support for Seagate BlackArmor NAS220

The Seagate BlackArmor NAS220 is a consumer NAS
with two internal drive bays. The stock OS runs
RAID 1 over the disks via mdadm.

Device specification:
- SoC: Marvell 88F6192 800 MHz
- RAM: 128 MB
- Flash: 32 MB
- 2 x internal SATA II drives
- Ethernet: 10/100/1000 Mbps (single port, no switch)
- WLAN: None
- LED: Power, Status, Sata Activity
- Key: Power, Reset
- Serial: 10 pin header, (115200,8,N,1), 3.3V TTL
	9|x  -   x|10
	7|x  -   x|8
	5|x  - GND|6
	3|x  -  RX|4
	1|TX -   x|2
	front of case
- USB ports: 2 x USB 2.0

Flash instruction:

NOTE: this process uses a serial connection. It will upgrade the
bootloader and reset the bootloader environment variables

TFTP server setup
- Setup PC with TFTP server set the PC IP to 10.4.50.5 as TFTP server
- Copy these files to TFTP server location
    - u-boot.kwb
    - seagate_blackarmor-nas220-initramfs-uImage
    - seagate_blackarmor-nas220-squashfs-sysupgrade.bin
    - seagate_blackarmor-nas220-squashfs-factory.bin

Seagate NAS setup
- Connect LAN cable between PC and seagate device
- Connect to serial to seagate device

Install u-boot
- Boot seagate device and stop in bootloader by pressing any key
- run 'printenv' from u-boot and save the values
- tftpboot 0x2000000 u-boot.kwb
- nand erase.part uboot
- nand write 0x2000000 0x0 ${filesize}
- reset

Update MAC address in u-boot env
- Stop in u-boot by pressing any key
- Get your MAC address from your saved printenv. Is also on chassis
- setenv ethaddr <your MAC>
- saveenv

Option 1 (recommended) - Install OpenWrt via initramfs and sysupgrade
- tftpboot 0x2000000 seagate_blackarmor-nas220-initramfs-uImage
- bootm 0x2000000
- *OpenWrt should be running now, however it is not written to flash yet*
- From the running instance of OpenWrt use Luci's "flash image" feature
    from the web site or use sysupgrade from the console to write
    seagate_blackarmor-nas220-squashfs-sysupgrade.bin to flash

Option 2 - Install OpenWrt by flashing factory image from u-boot
- nand erase.part ubi
- tftpboot 0x2000000 seagate_blackarmor-nas220-squashfs-factory.bin
- nand write 0x2000000 ubi ${filesize}
- reset

Signed-off-by: Kip Porterfield <kip.porterfield@gmail.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/target/linux/kirkwood/patches-5.4/203-blackarmor-nas220.patch b/target/linux/kirkwood/patches-5.4/203-blackarmor-nas220.patch
new file mode 100644
index 0000000000..e04a28206a
--- /dev/null
+++ b/target/linux/kirkwood/patches-5.4/203-blackarmor-nas220.patch
@@ -0,0 +1,99 @@
+--- a/arch/arm/boot/dts/kirkwood-blackarmor-nas220.dts
++++ b/arch/arm/boot/dts/kirkwood-blackarmor-nas220.dts
+@@ -17,6 +17,13 @@
+ 	compatible = "seagate,blackarmor-nas220","marvell,kirkwood-88f6192",
+ 		     "marvell,kirkwood";
+ 
++	aliases {
++		led-boot = &led_status_amber;
++		led-failsafe = &led_status_amber;
++		led-running = &led_status_blue;
++		led-upgrade = &led_status_amber;
++	};
++
+ 	memory { /* 128 MB */
+ 		device_type = "memory";
+ 		reg = <0x00000000 0x8000000>;
+@@ -36,14 +43,14 @@
+ 		compatible = "gpio-keys";
+ 
+ 		reset {
+-			label = "Reset";
+-			linux,code = <KEY_POWER>;
++			label = "Reset Button";
++			linux,code = <KEY_RESTART>;
+ 			gpios = <&gpio0 29 GPIO_ACTIVE_HIGH>;
+ 		};
+ 
+-		button {
+-			label = "Power";
+-			linux,code = <KEY_SLEEP>;
++		power {
++			label = "Power Button";
++			linux,code = <KEY_POWER>;
+ 			gpios = <&gpio0 26 GPIO_ACTIVE_LOW>;
+ 		};
+ 	};
+@@ -51,11 +58,27 @@
+ 	gpio-leds {
+ 		compatible = "gpio-leds";
+ 
+-		blue-power {
++		led_power_blue: power_blue {
+ 			label = "nas220:blue:power";
+ 			gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+ 			linux,default-trigger = "default-on";
+ 		};
++
++		disk_blue {
++			label = "nas220:blue:disk";
++			gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;
++			linux,default-trigger = "disk-activity";
++		};
++
++		led_status_blue: status_blue {
++			label = "nas220:blue:status";
++			gpios = <&gpio0 23 GPIO_ACTIVE_HIGH>;
++		};
++
++		led_status_amber: status_amber {
++			label = "nas220:amber:status";
++			gpios = <&gpio0 22 GPIO_ACTIVE_HIGH>;
++		};
+ 	};
+ 
+ 	regulators {
+@@ -153,6 +176,33 @@
+ 
+ &nand {
+ 	status = "okay";
++
++	partitions {
++		compatible = "fixed-partitions";
++
++		partition@0 {
++			label = "uboot";
++			reg = <0x0 0xa0000>;
++			read-only;
++		};
++
++		partition@a0000 {
++			label = "uboot-env";
++			reg = <0xa0000 0x10000>;
++			read-only;
++		};
++
++		partition@b0000 {
++			label = "reserved";
++			reg = <0xb0000 0x10000>;
++			read-only;
++		};
++
++		partition@c0000 {
++			label = "ubi";
++			reg = <0xc0000 0x1e80000>;
++		};
++	};
+ };
+ 
+ &mdio {