qualcommax: ipq50xx: Add support for CMCC PZ-L8

qualcommax: ipq50xx: Add support for CMCC PZ-L8

CMCC PZ-L8 is a 2.4/5 GHz band 11ax (Wi-Fi 6) router, based on IPQ5000.

Specifications:
- SoC			: Qualcomm IPQ5000
- RAM			: Integrated 256MiB DDR3L
- Flash			: 128 MiB SPI-NAND (ESMT F50D1G41LB)
- WLAN			: 2.4/5 GHz 2T2R
- 	2.4 GHz		: Qualcomm IPQ5000 (SoC)
- 	5 GHz		: Qualcomm Atheros QCN6102
- Ethernet		: 4x 10/100/1000 Mbps
- 	switch		: Qualcomm Atheros QCA8337
- LEDs/Keys (GPIO)	: 2x LEDs, 2x Keys
- UART			: Through-hole on PCB, 4pins in the middle of the black aluminum heat sink
- 	assignment	: 3.3V, GND,TX, RX (from left to right)
- 	settings	: 115200n8
- Power			: 12 VDC, 1 A

Flashing Instructions:
1. SSH Method
	(1) Enable SSH on the stock firmware
	a. Version 501.8 and 501.9:
	Log in to http://192.168.10.1 with the password on the sticker
	Append "/admin/system/admin" to the URL and press Enter
	Delete "Dropbear instance", click "Add instance", then "Save and Apply"
	Reboot the router

	b. Version 501.11 and 501.12:
	While the router is running the stock firmware, press and hold the reset button for 20-30 seconds
	Open http://192.168.10.1:56781 and login with username "root" and the password on the sticker
	Run "vi /etc/config/dropbear" and delete the line "option enable '0'"
	Reboot the router

	(2) Upload the factory.ubi file to router's /tmp directory (using scp or wget)
	and execute the following commands in the router's shell

	export rootfs=$(cat /proc/mtd | grep rootfs | grep -v _ | cut -d: -f1)
	ubidetach -f -p /dev/${rootfs}
	ubiformat /dev/${rootfs} -y -f /tmp/factory.ubi

2. U-Boot Method using UBI Image
	Place the factory.ubi file on your TFTP server, enter U-Boot CLI and exec these commands

	tftpboot <your_tftp_server_ip>:factory.ubi
	flash rootfs
	reset

3. U-Boot Method using initramfs Image
	(1) Place the openwrt-*-initramfs-fit-uImage.itb file on your TFTP server
	and rename it to initramfs.bin
	(2) Enable serial console, enter to U-Boot CLI and exec these commands

	tftpboot <your_tftp_server_ip>:initramfs.bin
	bootm

	(3) Once boot completed, upload the sysupgrade.bin file to router's /tmp directory
	(using scp or wget) and execute the following command in openwrt shell

	sysupgrade -n /tmp/sysupgrade.bin

Switching to the Stock Firmware:
Please follow the commit https://github.com/openwrt/openwrt/commit/3b7d72bc2ecca2f962319b0a4fb9beb7609a0222

Partition Layout (Stock Firmware):
0x000000000000-0x000000080000 : "0:SBL1"
0x000000080000-0x000000100000 : "0:MIBIB"
0x000000100000-0x000000140000 : "0:BOOTCONFIG"
0x000000140000-0x000000180000 : "0:BOOTCONFIG1"
0x000000180000-0x000000280000 : "0:QSEE"
0x000000280000-0x000000380000 : "0:QSEE_1"
0x000000380000-0x0000003c0000 : "0:DEVCFG"
0x0000003c0000-0x000000400000 : "0:DEVCFG_1"
0x000000400000-0x000000440000 : "0:CDT"
0x000000440000-0x000000480000 : "0:CDT_1"
0x000000480000-0x000000500000 : "0:APPSBLENV"
0x000000500000-0x000000640000 : "0:APPSBL"
0x000000640000-0x000000780000 : "0:APPSBL_1"
0x000000780000-0x000000880000 : "0:ART"
0x000000880000-0x000000900000 : "0:TRAINING"
0x000000900000-0x000004300000 : "rootfs"
0x000004300000-0x000007d00000 : "rootfs_1"

Notes:
This device is almost the same as ELECOM WRC-X3000GS2, including partition layout and the dual-boot feature.

Known Issues:
- All Wi-Fi related peripherals are disabled in device tree, since 256 MiB RAM is too few for ath11k.
- This device has another version with nand flash FM25SL01, which is not supported at the moment.
  https://github.com/immortalwrt/immortalwrt/blob/master/target/linux/mediatek/patches-6.12/342-mtd-spinand-Support-fmsh.patch

MAC Addresses:
Interface	MAC Address		Location (binary)
LAN		A4:39:B6:xx:xx:9D	(0:ART, 0x00-0x05)
WAN		A4:39:B6:xx:xx:9E	(0:ART, 0x06-0x0B)
2.4 GHz		A4:39:B6:xx:xx:9F	(0:ART, 0x0C-0x11)
5 GHz		A4:39:B6:xx:xx:A0	(0:ART, 0x12-0x17)

Signed-off-by: Chang Liu <[email protected]>