# RTL8735BDM (AmebaPro2) — MIPI CSI-2 lane configuration query for IMX327 sensor support

**URL:** <https://forum.amebaiot.com/t/rtl8735bdm-amebapro2-mipi-csi-2-lane-configuration-query-for-imx327-sensor-support/5045>\
**Category:** Multimedia\
**Created:** [September 7, 2026, 5:19am UTC](https://forum.amebaiot.com/t/rtl8735bdm-amebapro2-mipi-csi-2-lane-configuration-query-for-imx327-sensor-support/5045 "2026-09-07T05:19:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![deepakkumarbinwal](https://avatars.discourse-cdn.com/v4/letter/d/22d042/32.png) [@deepakkumarbinwal](https://forum.amebaiot.com/u/deepakkumarbinwal)\
**Post date:** [September 7, 2026, 5:19am UTC](https://forum.amebaiot.com/t/rtl8735bdm-amebapro2-mipi-csi-2-lane-configuration-query-for-imx327-sensor-support/5045/1 "2026-09-07T05:19:04Z")

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Hi,

We’re using the RTL8735BDM (AmebaPro2) in our video doorbell product, building against the ameba-rtos-pro2 SDK release (9.6\_r): [GitHub - Ameba-AIoT/ameba-rtos-pro2: Realtek Official IoT Software Development Kit for Ameba Series SoC: (Ameba Pro2) · GitHub](https://github.com/Ameba-AIoT/ameba-rtos-pro2)

We’re evaluating adding a Sony IMX327 sensor via a camera module that connects over a 15-pin FPC, which physically wires only 2 MIPI CSI-2 data lanes (lane0 + lane1, plus clock) to the RTL8735BDM — lanes 2 and 3 are not routed on our board. The SDK’s sensor.h already defines SENSOR\_IMX327, with sensor\_imx327.bin and iq\_imx327.bin present under component/soc/8735b/fwlib/rtl8735b/lib/source/ram/video/voe\_bin/.

We couldn’t find any lane-count configuration exposed in the SDK source (module\_video.c, video\_user\_boot.c, sensor.h) — it appears to be baked into these binary blobs. Could you help confirm:

1. Is sensor\_imx327.bin / iq\_imx327.bin configured for 2-lane or 4-lane MIPI CSI-2 receive on the ISP side?
2. If it’s currently tuned for 4-lane, is a 2-lane-configured variant of this blob available, or can it be retuned/rebuilt for 2-lane operation?
3. More generally — is there a supported way to select/override MIPI lane count per sensor from application code, rather than it being fixed inside the blob?
4. Separately, just to sanity-check our own board design assumption: does a 15-pin camera FPC connector (the common Raspberry-Pi-style camera connector convention) support 4-lane MIPI CSI-2 at all, or is that pin count inherently limited to 2 lanes plus clock? We’ve assumed the latter (not enough conductors for 4 data lanes + clock + grounds in 15 pins) but wanted to confirm against your experience with other customer designs.

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**Author:** ![yenhuei](https://avatars.discourse-cdn.com/v4/letter/y/a8b319/32.png) [@yenhuei](https://forum.amebaiot.com/u/yenhuei)\
**Post date:** [September 9, 2026, 10:22am UTC](https://forum.amebaiot.com/t/rtl8735bdm-amebapro2-mipi-csi-2-lane-configuration-query-for-imx327-sensor-support/5045/2 "2026-09-09T10:22:29Z")

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Hi @deepakkumarbinwal

You are absolutely right that it is compiled into a binary file. The source codes can be found [here](https://github.com/Ameba-AIoT/ameba-camera-sensor-driver/tree/main/rtl8735_driver_code_sensor/source/sensor/sony/imx327) in the repository. The link should direct you to our drivers for IMX327.

1. Our default sensor\_imx327.bin is meant for a 2-lane configuration, but you can always recompile it to a 4-lane MIPI setup in `static int imx327_get_init_info() ` from the `sensor_imx327_mipi.c`. The IQ is not affected by the lane configurations.
2. 
  - 

3. I have not experimented with changing the MIPI lane count from the application code, do let me know if you wish to do so. I will try to see if it is doable.
4. Unfortunately (or fortunately), the 15-pin configuration that is compatible with the RaspberryPi only has 2 MIPI lanes on them so that means our `sensor_imx327.bin` should work right out the box. I had successfully tested the drivers with a 15-pin IMX327 from Arducam on the AMB82-Mini months back so you should be fine.  
Furthermore, only the 22-pin variants can potentially support up to 4 lanes. You may refer to this [documentation](https://docs.arducam.com/Raspberry-Pi-Camera/raspberry-pi-camera-pinout/#raspberry-pi-22pin-mipi-csi-connector-pinout) to see the pinout for 15/22-pins.