New Yocto Release fsimx6ul-B2024.03

  • F&S i.MX6UL Yocto Release 2024.03 (fsimx6ul-Y2024.03)

    Please see the file


    for a description of how everything is installed and used. This doc sub-directory also contains other documentation, for example about the hardware of the boards and the starter kits.

    This is a major release for all F&S boards and modules based on the i.MX6-UltraLite and i.MX6ULL CPUs from NXP (or i.MX6UL and i.MX6ULL for short).

    Currently these are the modules efusA7UL, PicoCOM1.2, PicoCoreMX6UL, PicoCoreMX6UL100 and PicoCOMA7.

    More boards may be added to this family in the future.

    All these boards can work with software that is created from this release package.

    Please note that Buildroot releases use a 'Y' for the version number. The version counting is independent form other releases.

    The release consists of the following files and directories:

    • README.txt Release notes (this text)
    • setup-yocto Script to download and install the Yocto release
    • fs-release-manifest.xml Definition of Source Code Versions
    • binaries/ Precompiled images (full names)
    • sdcard/ Precompiled images (names as expected by install script)
    • doc/ Hardware and software manuals, schematics

    Here are some highlights of this release.

    1. New Linux Kernel 5.15.148

    The Linux kernel is now based on 5.15.148

    - New optimizations for EXT4.

    - OverlayFS has better performance and copying up more attributes.

    - Many graphics improvements among the DRM/KMS drivers.

    - Linux 5.15 I/O can achieve up to ~3.5M IOPS per-core.

    - The PREEMPT_RT locking code was merged as a big step forward towards getting the real-time (RT) patches upstreamed in the Linux kernel.

    - Various scheduler improvements.

    - Various power management improvements.

    - Opt-in L1 data cache flushing on context switching as a security feature for the paranoid and other specialized conditions.

    - Improvements around compile-time and run-time detection of buffer overflows.

    - Additional protection around side channel attacks via clearing used registers prior to returning, making use of the compiler-side support.


    Of course, there are also many changes for other CPU types (like x86) and other graphics cores (like AMD, Nvidia, Intel) but these are not of interest here.

    2. New bootloader U-Boot 2021.04

    The U-Boot is now based on 2021.04.

    Additional to the security and feature updates of the mainline U-Boot, there have been many updates on the fsimage command and the general layout of the bootloaders in the flash memory.

    3. New Yocto version 4.0 Kirkstone

    Updating Yocto to Version 4.0 Kirkstone. This provides many new package versions like Qt6.3 or Chroium 101.

    We have also updated the poky layer to version 4.0.16

    4. Improved Image versioning

    The exact versions of Nboot, U-Boot and Linux Kernel will now be printed during the boot process.

    If the image is build with an tagged commit the tag name will be printed.

    If the commit is not tagged, the git commits hash will be printed.

    If the image is based on an uncommitted git, the flag "-dirty" will be added to the last commits name.

    We use an own Linux version string that will be printed additionally to the mainline Linux version. This way modules that are built for the same Linux version with just some slight changes, can still be loaded without rebuilding the whole rootfile system.

    Linux device trees are also versioned with the current version of the linux git.

    You can check the versions of the different components at runtime at /sys/bdinfo/

    5. New Release concept over github

    We now provide our Linux gits over github at

    All release and pre-release states will be pushed here.

    For now, we will not push each single commit to github.

    Also the release sources are not added to the release tar anymore, but will be downloaded from github during the setup process.

    The versions of the different gits of a release can be looked up in the fs-release-manifest.xml file in the release tar directory.

    6. New Azurewave wlan driver

    Additional to the mainline SD-BT-8997 driver we now provide the NXP version. This driver supports additional security features, optimized. STA and AP modes and improved roaming.

    To activate the nxp mlan driver uncomment the respective lines in: recipes-kernel/kernel-modules/files/mxm-wifiex.conf

    Also comment out the line for the mainline mwifiex driver.

    Please note that bluetooth is currently not supported with the nxp-mlan driver. For Bluetooth please use the mainline driver.

    Known Issues

    1. This Release does not support the Silex WLAN chip on the modules efusA7UL

    There is currently no driver avaialble for the Linux Kernel 5.15 For Silex WLAN chip support, please use the release fsimx6ul-Y2020.03


    The following list shows the most noticeable changes in this release in

    more detail since our last release for this platform. Please note that the

    source code is also used for other platforms. This is why you will

    also find references to other CPU types and F&S boards here in the

    change log.

    nbootimx6ul_51.bin (VN51)


    Supported boards: efusA7UL PicoCOM1.2 PicoCoreMX6UL PicoCoreMX6UL100 PicoCOMA7


    - 0005378: [NBoot] Ad9 support for new boards efusA9Xr2, armStoneA9R3, armStoneA9r4, PicoCoreMX6SXr2


    - 0005541: [NBoot] NAND dump does not work

    - 0005540: [NBoot] Memory errors on armStoneA9

    - 0005542: [NBoot] Board revision is wrong on armStoneA9


    - 0005951: [NBoot] Add new board NetDCUA7

    - 0005950: [NBoot] Add secure boot for UL with MMC



    Supported boards: efusA7UL PicoCOM1.2 PicoCoreMX6UL PicoCoreMX6UL100 PicoCOMA7

    - Update to NXP u-boot-201.04

    - Improve Uboot versioning

    - Fix bootaux command

    - Fix fat_size for files bigger than 2GB

    - Drop board revision from BOARD-CFG names

    - Check for crc32 and xxd before using them

    - Remove sha256 support



    Supported boards: efusA7UL PicoCOM1.2 PicoCoreMX6UL PicoCoreMX6UL100 PicoCOMA7

    - Update to NXP Linux Version lf-5.15.71-2.2.1

    - Switch to FSL_ASOC_CARD sound driver for sgtl5000

    - Add F&S Versioning for kernel and device tree

    - Improve uart dma support

    - Add leds-pca963x-fus driver and revert the original to the mainline driver

    - Enable power key support for PicoCore boards

    - Improve SDIO stability for Azurewave wlan chips

    - Add support to disable pin controls nodes in the device tree

    - Fix Realtek Ethernet Phy Bug in Low Power Mode

    - Apply patches from mainline linux-5.15.148

    - Fix fsimx6ul 512MHz dc supply warning

    - Add display support for BT070L1060CS0I1AD



    Supported boards: efusA7UL PicoCOM1.2 PicoCoreMX6UL PicoCoreMX6UL100 PicoCOMA7

    - Create standalone meta-fus repository

    - Update meta-fus to Kirkstone (Yocto 4.0)

    - Add new packages to fus-image-std:fiwared, can-utils, libgpiod-tools, spitools

    - Fix out-of-tree kernel module building

    - Add optional nxp-wifi driver support for Azurewave wlan

    - Add calibration file for TSC2004 touch chip

    - Add layer versions to the final image

    - Set default Linux terminal to vt100

    - Remove Kernel Image from the rootfs

    - Add F&S psplash Logo

    - Update fsimx6ul machine to Yocto 4.0



    (no changes)



    - Update to version 2.5 of FSiMX6UL_FirstSteps_eng.pdf

    - Update to version 0.23 of LinuxOnFSBoards_eng.pdf

    Please download the hardware documentation directly from our website.

    Then you always have the newest version.