I bought a new EAP660 HD from Amazon thinking it would still be V1, but turns out they updated the hardware. I took pictures and transcribed all the chip IDs. I'll get into the uboot later and try to dump the firmware. For now, what do you guys think for possible compatibility with the current V1 images? I'll post GPTs list here of the chips and expected functions of each.
Main Wireless and SoC Components
Chip 6: IPQ8072A
Type: SoC (System on Chip)
Manufacturer: Qualcomm
Specs:
Quad-core ARM Cortex-A53 @ up to 2.2 GHz
Integrated network acceleration engines
Wi-Fi 6 / 802.11ax support (not used directly for radios, but coordinates them)
Used in high-end routers
Function: Main CPU and routing engine
Chip 2: QCN5024
Type: Wi-Fi 6 (802.11ax) Radio
Band: 2.4 GHz
Manufacturer: Qualcomm
Specs:
Supports up to 4 spatial streams
Designed for high-performance AX access points
Function: Handles 2.4 GHz Wi-Fi radios
Chip 3: QCN5054
Type: Wi-Fi 6 (802.11ax) Radio
Band: 5 GHz
Manufacturer: Qualcomm
Specs:
4x4 MU-MIMO support
High-throughput 5 GHz support
Function: Handles 5 GHz Wi-Fi radios
Chip 4: QCA8081
Type: Ethernet PHY
Manufacturer: Qualcomm
Specs:
1-port 2.5Gbps Ethernet PHY
Interfaces via SGMII or USXGMII
Function: Physical interface for the 2.5G LAN port
Chip 9: PMP8074
Type: Power Management IC (PMIC)
Manufacturer: Qualcomm
Function: Voltage regulation and power sequencing for IPQ8072A
Memory Components
Chip 5 (x2): ESMT M15T4G16256A
Type: DDR3L SDRAM
Manufacturer: ESMT
Specs:
4 Gb (512 MB) per chip
2 chips = 1 GB total system RAM
Chip 10: Spansion S34MS01G200TFI00
Type: NAND Flash
Manufacturer: Cypress (Spansion)
Specs:
1 Gb (128 MB) SLC NAND
Function: Primary storage for firmware
Wireless MCU / Zigbee or Thread Component
Chip 1: TI CC2652P
Type: Wireless MCU
Manufacturer: Texas Instruments
Specs:
ARM Cortex-M4
802.15.4 (Zigbee, Thread, BLE) radio
Likely unused in standard AP use; may be for mesh/backhaul features
Function: Possibly Zigbee/Thread for future expansion or mesh assist
Antenna/Signal Chain Components
Chip 7: 4721 841 M107
Most Likely: Skyworks SKY85721
Function: 5GHz Power Amplifier Module (PA + LNA + switch)
Chip 8: 85340 4895743 2431 MX
Most Likely: Skyworks SKY85340
Function: 2.4GHz Front-End Module (LNA/PA)
These Skyworks chips are usually paired in sets per antenna chain, matching the 4x4 layout you describe. Likely for dual-band or multiple antenna arrays.
Comparison to V1 of EAP660 HD
The V1 likely uses:
IPQ8072 (non-A version)
Same QCN5024/QCN5054
Different RAM and flash suppliers
Very similar RF front-end but possibly fewer chains
Here's a picture of what I expect to be the TTL serial port.
Here's more board pictures for reference.
Here's some unpopulated footprints for a second Ethernet PHY and maybe USB or SFP? Edit: based on pin count, it's probably an SD card slot used in firmware debugging for rapid prototyping. Might still be an option in the release uboot to start from there.
Main SOC
