qualcommax: ipq807x: add support for Linksys MX8500

qualcommax: ipq807x: add support for Linksys MX8500

Hardware specification:
========
SoC: Qualcomm IPQ8072A
Flash: 512MB (Fidelix FMND4G08S3J-ID)
RAM: 1GB (2x Kingston DDR3L D2516ECMDXGJD)
Ethernet: 1x 10/100/1000/2500/5000Mbps (Marvell AQR114C)
Ethernet: 4x 10/100/1000Mbps (Qualcomm QCA8075)
WiFi1: 6GHz ax 4x4 (Qualcomm QCN9024 + Skyworks SKY85784-11) - channels 33-229
WiFi2: 5GHz ax 4x4 (Qualcomm QCN5054 + Skyworks SKY85755-11) - channels 36-177
WiFi3: 2.4GHz ax 4x4 (Qualcomm QCN5024 + Skyworks SKY8340-11)
IoT: Bluetooth 5, Zigbee and Thread (NXP K32W041)
LED: 1x RGB status (NXP PCA9633)
USB: 1x USB 3.0
Button: WPS, Reset

Flash instructions:
========
1. Manually upgrade firmware using openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin image.
More details can be found here: https://www.linksys.com/support-article?articleNum=47547
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-ipq807x-linksys_mx8500-squashfs-factory.bin kernel
and in case of 1:
- mtd -r -e alt_kernel -n write openwrt-qualcommax-ipq807x-linksys_mx8500-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/mtd21 0 0
- nandwrite -p /dev/mtd21 openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin
or in case of 1:
- flash_erase /dev/mtd23 0 0
- nandwrite -p /dev/mtd23 openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin
After first boot install firmware on second partition:
- mtd -r -e kernel -n write openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin kernel
or:
- mtd -r -e alt_kernel -n write openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin alt_kernel

3. Installation from initramfs image using USB drive:
Put the initramfs image on the USB drive:
- dd bs=1M if=openwrt-qualcommax-ipq807x-linksys_mx8500-initramfs-uImage.itb of=/dev/sda
Stop u-boot and run:
- usb start && usbboot $loadaddr 0 && bootm $loadaddr
Write firmware to the flash from initramfs:
- mtd -e kernel -n write openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin kernel
and:
- mtd -r -e alt_kernel -n write openwrt-qualcommax-ipq807x-linksys_mx8500-squashfs-factory.bin alt_kernel

4. Back to the OEM firmware:
- mtd -e kernel -n write FW_MX8500_1.0.11.208937_prod.img kernel
and:
- mtd -r -e alt_kernel -n write FW_MX8500_1.0.11.208937_prod.img alt_kernel

5. USB recovery:
Put the initramfs image on the USB:
- dd bs=1M if=openwrt-qualcommax-ipq807x-linksys_mx8500-initramfs-uImage.itb of=/dev/sda
Set u-boot env:
- fw_setenv bootusb 'usb start && usbboot $loadaddr 0 && bootm $loadaddr'
- fw_setenv bootcmd 'run bootusb; if test $auto_recovery = no; then bootipq; elif test $boot_part = 1; then run bootpart1; else run bootpart2; fi'

AQR firmware:
========
1. Firmware loading:
To properly load the firmware and initialize AQR PHY, we must use the u-boot aq_load_fw function.
To do this, you need to modify u-boot env:
With USB recovery:
- fw_setenv bootcmd 'aq_load_fw; run bootusb; if test $auto_recovery = no; then bootipq; elif test $boot_part = 1; then run bootpart1; else run bootpart2; fi'
and without:
- fw_setenv bootcmd 'aq_load_fw; if test $auto_recovery = no; then bootipq; elif test $boot_part = 1; then run bootpart1; else run bootpart2; fi'

2. Firmware updating:
Newer firmware (AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005.cld) is available in the latest OEM firmware.
To load this firmware via u-boot, we need to add the MBN header and update 0:ethphyfw partition.
For MBN header we can use script from this repository: https://github.com/testuser7/aqr_mbn_tool
- python aqr_mbn_tool.py AQR-G4_v5.6.5-AQR_WNC_SAQA-L2_GT_ID45287_VER24005.cld
To update partition we need to install kmod-mtd-rw package first:
- insmod mtd-rw.ko i_want_a_brick=1
- mtd -e /dev/mtd26 -n write aqr_fw.mbn /dev/mtd26

Signed-off-by: Paweł Owoc <frut3k7@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/14883
Signed-off-by: Robert Marko <robimarko@gmail.com>