qualcommax: ipq50xx: add support for Linksys MX2000 and MX5500

qualcommax: ipq50xx: add support for Linksys MX2000 and MX5500

Add support for Linksys MX2000 (Atlas 6) and MX5500 (Atlas 6 Pro).
These devices are completely identical except for the secondary wifi
chip used for 5Ghz: QCN6102 is used on MX2000 while QCN9024 is used
on MX5500

Speficiations:
* SoC: Qualcomm IPQ5018 (64-bit dual-core ARM Cortex-A53 @ 1.0Ghz)
* Memory: Winbond W634GU6NB-11 (512 MiB DDR3-933)
* Serial Port: 3v3 TTL 115200n8
* Wi-Fi: IPQ5018 (2x2 2.4 Ghz 802.11b/g/n/ax)
* Wi-Fi: MX2000: QCN6102 (2x2:2 5 Ghz 802.11an/ac/ax)
         MX5500: QCN9024 (4x4:4 5 Ghz 802.11an/ac/ax)
* Ethernet: IPQ5018 integrated virtual switch connected to an external
            QCA8337 switch (4 Ports 10/100/1000 GBASE-T)
* Flash: Macronix MX35UF2GE4AD (256 MiB)
* LEDs: 1x multi-color PWM LED
* Buttons: 1x WPS (GPIO 27 Active Low)
           1x Reset (GPIO 28 Acive Low)

Flash instructions (in case of MX2000, else replace with MX5500 images):
1. On OEM firmware, login to the device (typically at http://192.168.1.1) and click 'CA'
in the bottom right corner -> Connectivity -> Manual Upgrade. Alternatively, browse to
http://<router IP>/fwupdate.html.
Upgrade firmware using openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin image.
Optionally install on second partition, after first boot check actual partition:
fw_printenv -n boot_part
and install firmware on second partition using command in case of 2:
mtd -r -e kernel -n write openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin kernel
and in case of 1:
mtd -r -e alt_kernel -n write openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin alt_kernel
2. Installation using serial connection from OEM firmware (default login: root, password: admin):
fw_printenv -n boot_part
In case of 2:
flash_erase /dev/mtd12 0 0
nandwrite -p /dev/mtd12 openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin
or in case of 1:
flash_erase /dev/mtd14 0 0
nandwrite -p /dev/mtd14 openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin
After first boot install firmware on second partition:
mtd -r -e kernel -n write openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin kernel
or:
mtd -r -e alt_kernel -n write openwrt-qualcommax-ipq50xx-linksys_mx2000-squashfs-factory.bin alt_kernel
3. Back to the OEM firmware.
Download firmware from OEM website:
MX2000: https://support.linksys.com/kb/article/585-en/
MX5500: https://support.linksys.com/kb/article/587-en/
From serial or SSH:
fw_printenv boot_part
in case of 1:
mtd -r -e alt_kernel -n write FW_MX2000_1.1.7.210469_prod.img alt_kernel
else in case of 2:
mtd -r -e kernel -n write FW_MX2000_1.1.7.210469_prod.img kernel

Signed-off-by: George Moussalem <george.moussalem@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/17182
Signed-off-by: Robert Marko <robimarko@gmail.com>