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

BSP-Yocto-Ampliphy-i.MX6-PD21.1.0       2021-10-15
==================================================
- Linux Kernel v5.10.48 (LTS kernel)
  * Update from v4.19.100 to v5.10.48
- barebox v2021.04.0
- Yocto 3.3.1 (hardknott)
- Qt 5.15.2 from meta-qt5 (hardknott)
- RAUC 1.5.1 from meta-rauc

Tested Yocto Images:
--------------------
- phytec-qt5demo-image

Build Environment:
------------------
- Ubuntu 20.04 64Bit

Supported Machines:
---------
- phyboard-mira-imx6-3
- phyboard-mira-imx6-5
- phyboard-mira-imx6-14
- phyflex-imx6-1
- phyflex-imx6-2
- phyflex-imx6-8
- phyboard-nunki-imx6-1
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-PD21.1.0

Changes since PD20.1.0:
-----------------------
- New Features:
  * New PEB-WLBT-05 radio module with Wifi and Bluetooth support
  * Camera selection is now handled by devicetree overlays and can be
    accessed from userspace and barebox, see /overlays/README.md in userspace
  * Systemd-timesyncd NTP-client is now added as a new feature package in
    the BSP

- Fixes:
  * Kernel:
    - Line-In input now works on phyFLEX-i.MX6.
    - Can now set CMA size of 265 MB on SOM's with 1 GB RAM.
    - HDMI audio issue is now fixed and working.

- Notes:
  * The number of supported board variants have been shortened.
    For a list of supported boards, see 'Supported Machines' above. For
    questions about alternative board variants please contact our support team.
  * SecureKey as key type for cryptographic uses has been changed to
    TrustedKey with caam support.
  * The rauc_init_nand for setting the RAUC partitions in NAND is moved from
    Barebox to Linux Kernel. See RAUC user manual for more information.

Known Issues:
-------------
- general:
  * Playing H264 encoded videos with VPU decoding support via QT has limited
    framerate for higher resolutions.
  * 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

- barebox:
  * Deactivating the Ethernet interface with 'ifdown' after a successful
    init causes the system to freeze on attempts to establish a connection
    afterwards.

- 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]
  * On phyFLEX modules, there is a very rare occurrance of system freeze
    during the LDO bypass enable process on boot.
  * In rare cases, rebooting the system fails due to an i2c bus issue, which
    prevents sending the final reboot command to the PMIC.
  * 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