Currently luckfox pico is tied to:
- builldroot 2023.02.06
- Linux kernel 5.10.110
- Busybox 1.36.1

Where in the SDK are those versions defined ? What would it take to use another version of any of those components ?

I checked, and it works.
Thanks a lot for your patience !
I think I will add few targets in the build.sh script to allow an easy config of buildroot and busybox ...

I tried this and the result is somehow bizarre. The parts of busybox I deselected are still present, but their hook within busybox is gone, and size of busybox changed.

So, for example I disabled all about TELNETD. But in the resulting firmware that i flashed i can observe_

# ls -al /usr/sbin ...

I´d like to change the default "luckfox" password. Yes I know I can change the default password in the running system, but it´s not what I´m trying to achieve. I want to change it and the changes to be kept into my build.

I identified a place where the default root password is configured:
sysdrv ...

I need to configure Busybox to enable / disable features.
On luckfox, buildroot is configured to use busybox.

The sysdrv/Makefile does a copy of a default snippet configuration to the busybox included in buildroot:
cp $(SYSDRV_DIR)/tools/board/buildroot/busybox.config $(BUILDROOT_DIR)/$(BUILDROOT ...

Also done:
- Tested on latest Fedora FC39 and latest Debian 12.5 : same behavior on both platforms
- Edited sysdrv/tools/board/buildroot/luckfox_pico_defconfig and removed Samba, then repeated the steps above (also the ./build.sh clean rootfs step, and additionally did ./build.sh clean firmware ...

I believe this should work with the SDK as-is. You´d need to configure the kernel to add UVC USB gadget, then configure your usb gadget module
https://www.kernel.org/doc/html//next/u ... t_uvc.html

Hello and thank you a lot for your efforts helping me.
I still cannot get the same result than you, and I really wonder what obvious part I´m missing.
Here are the exact steps I do:

# cloning the SDK locally
git clone https://github.com/LuckfoxTECH/luckfox-pico.git
cd luckfox-pico

# I select ...

Sorry for the late answer and thank you for efforts helping me.
The procedure you give does not work.

- I start from scratch, clone the repository, then choose my board (RV1106 with OS on the SD card), and execute a first build.sh so that all parts of buildroot are downloaded. I then clean up the ...

cp $(SYSDRV_DIR)/tools/board/buildroot/samba_defconfig $(SYSDRV_DIR_OUT_ROOTFS)/etc/samba/smb.conf
cp $(SYSDRV_DIR)/tools/board/buildroot/smbpasswd_defconfig $(SYSDRV_DIR_OUT_ROOTFS)/etc/samba/smbpasswd


This is what i did and it seems to have no effect: those two config files are still there ...