Release Notes Unified i.MX6 Linux BSP:
======================================

BSP-Yocto-Ampliphy-i.MX6-PD25.1.0       2025-01-10
==================================================
- Linux Kernel v6.6.58 (LTS kernel)
  * Update from v5.15.102 to v6.6.58
  * Tag: v6.6.58-phy4
- barebox v2024.03.0
  * Tag: v2024.03.0-phy1
- Yocto 5.0.6 (scarthgap)
- Qt 6.7.3 from meta-qt6
- RAUC 1.12 from meta-rauc

Supported Machines:
-------------------
- phytec-headless-image on:
  * phyboard-mira-imx6-3
  * phyboard-mira-imx6-5
  * phyboard-mira-imx6-14

- phytec-qt6demo-image on:
  * phyboard-mira-imx6-3
  * phyboard-mira-imx6-5
  * phyboard-mira-imx6-14

- phytec-securiphy-image on:
  * phyboard-mira-imx6-3
  * phyboard-mira-imx6-5

- phytec-provisioning-image on:
  * phyboard-mira-imx6-5

Note: For decoding Machine Names into hardware ordering please visit our download area and use the machine decoder there.
https://www.phytec.de/bsp-download/?bsp=BSP-Yocto-Ampliphy-i.MX6-PD25.1.0

Build Environment:
------------------
- Ubuntu 22.04 64Bit

Changes since PD22.1.1:
-----------------------
- New Features:
  * Switch from Qt5 to Qt6 (previous phytec-qt5demo-image is still buildable
    but not tested).
  * Switch from EGLFS graphical backend to XWayland (customers requiring EGLFS
    BSP can still remove x11 and wayland from DISTRO_FEATURES on their own
    since EGLFS BSP is still buildable but not tested).
  * Qt resistive touchscreen support is now by default handled by the libinput
    instead of deprecated tslib library. Touch screen calibration can be
    performed by the BSP provided script "calibrate-res-touchscreen.sh".
  * Switch to using poky kernel fragment handling and using kernel defconfig
    "imx6_phytec_defconfig" instead of config fragments.

- Fixed issues:
  * An issue with LCD panel suspend/resume has been fixed by disabling the LCD
    panel autosuspend functionality. Now LCD panel works even after resuming
    from the system suspend.
  * Fixed an issue with cryptodev kernel module missing in the rootfs and
    openssl missing support for devcrypto engine.
  * Fixed inverted x- and y-axis of the stmpe touchscreen controller.

- Defeatured:
  * Removed BSP for phyBOARD-Nunki-i.MX6 and all phyFLEX-i.MX6 machines. Please
    note that BSP is still buildable but not tested.
  * Removed BSP for phyBOARD-Mira-i.MX6 machines phyboard-mira-imx6-15 and
    phyboard-mira-imx6-6. BSP is still buildable but not tested.

Known Issues:
-------------
- general:
  * Playing H264 encoded videos with VPU decoding support via QT has limited
    framerate for higher resolutions.
  * In PD25.1.0 release, the default 720p VP9 encoded video from qtphy (qt6
    demo) has been replaced by the 480p VP8 encoded video from phyRDKDemo (qt5
    demo) due to low performance (VPU does not support VP9 encoded videos).
  * The internal watchdog of the i.MX 6 cannot be used. We recommend to use
    the PMIC watchdog as preconfigured.
  * Building of RAUC casync bundles is disabled due to Issue
    https://github.com/rauc/rauc/issues/679

- kernel:
  * In rare cases (< 0.1%) during kernel boot the NAND flash fails to be
    detected with following error:
    gpmi_reset_block(f0a2a000): module reset timeout.
  * 1.2 GHz i.MX 6:
    - Controlling ARM and SOC voltages for DVFS with PMIC is not supported
      since the 1.2 GHz operating point is not allowed to be operated with
      the internal i.MX 6 LDO's in bypass mode. So this machine always
      operates with internal LDO's enabled which results in highly more heat
      generation on the SOC.
  * The LDB_DI0_SEL and LDB_DI1_SEL mux can only be set in the
    devicetree and cannot be changed on runtime.
  * The maximum pixel clock frequency for LVDS is 72 MHz.
  * The reboot command can cause rarely occurring kernel warnings when a task
    gets migrated to a CPU that is already offline.
    A workaround can be achieved by disabling the non-booting CPUs before
    rebooting. Related to:
      https://patchwork.kernel.org/project/linux-sh/patch/20200115063410.131692-1-hsinyi@chromium.org/
      [BSPYOCTOIMX6-1580]
  * In rare cases, the GPU does not start properly. User space Applications that
    use graphics fall back to software rendering.
    Error indicating a failure in the startup of the GPU:
      etnaviv-gpu 130000.gpu: GPU is not idle
      etnaviv-gpu 130000.gpu: GPU failed to reset: FE idle, 3D not idle, 2D not idle
      etnaviv-gpu 130000.gpu: GPU reset failed

- barebox:
  * If the network is configured as DHCP, the user need to repeat the "dhcp" or "if up" command for
    the IP to be assigned successfully.

Notes:
------
- In Yocto, kernel recipe was renamed from 'linux-mainline' to 'linux-phytec'.
  Git repository was moved to https://github.com/phytec/linux-phytec.
- Only phyCAMs VM-010 and VM-016 have been tested. Other phyCAM cameras are
  still supported but not tested with the BSP.