This is a list of known issues and limitations for Digi Embedded Yocto 2.6-r3:

Common

  • Firmware update

    • The software update package must be located in the root level of the update media (subfolders are not yet supported).

  • Cloud Connector

    • Remote file system management fails with long file names and paths (over 255 characters).

  • Wireless

    • Performance of the wireless interface is reduced when using concurrent mode, as the wireless interface is shared between several different functionalities.

    • When using wireless concurrent mode, Digi recommends you keep the different modes on the same frequency channels. For example, when configuring access point mode on channel 36 in the 5GHz band, connect to the same channel both in station mode and Wi-Fi direct so that the radio performance is optimized.

    • When working as an access point, DFS-capable channels in the 5GHz band are not supported.

    • For P2P connections, Digi recommends "Negotiated GO" modes. The QCA6564 devices (ConnectCore 6UL, ConnectCore 6 Plus) fail to join autonomous groups.

  • Trustfence

    • Trustfence is not yet supported on the ConnectCore 8M Nano.

ConnectCore 8M Nano

  • ConnectCore 8M Nano System-on-Module (SOM)

    • CPU wake-up sources are not yet supported.

  • ConnectCore 8M Nano DVK

    • The maximum bitrate for CAN interface is 125 Kbits/s. This is a software limitation from the CAN controller.

ConnectCore 8X

  • i.MX8QXP system-on-chip

    • GPU maximum performance reduced. The maximum frequency targets are 850 MHz for the shaders and 700 MHz for the core. However, in this hardware release the maximum frequency is limited to 650 MHz for the shaders and 600 MHz for the core, with the corresponding performance reduction. These targets will be met in future releases of the hardware.

    • BSDL operation is not supported. It will be available in future releases of the hardware.

IMPORTANT: DEY-2.6-r2 and DEY-2.6-r3 releases update the firmware of the System Control Unit (SCU).

This is an NXP proprietary firmware and its version in these releases is not compatible with the one released on DEY-2.6-r1. As a consequence:

  • Old U-Boot v2018.03-r1 cannot boot images from DEY-2.6-r2 or newer releases.

  • U-Boot v2018.03-r2 or newer cannot boot images from release DEY-2.6-r1.

To successfully run DEY-2.6-r2 or newer images you need to update the U-Boot on your device.

ConnectCore 6UL

  • ConnectCore 6UL System-on-Module (SOM)

    • The UART connected to the Bluetooth chip on early versions of the ConnectCore 6UL system-on-module (hardware version < 4) cannot properly execute flow control. To work around this issue, UART1 of these SOM versions has been configured to operate at 115200 bps and without hardware flow control, reducing the maximum throughput of this interface.

    • Wi-Fi

      • The QCA6564 wireless chip does not support Wake On Wireless LAN.

ConnectCore 6 Plus

  • i.MX6 system-on-chip

    • NXP i.MX6 processor has a documented errata (ERR004512) whereby the maximum performance of the Gigabit FEC is limited to 400Mbps (total for Tx and Rx).

  • ConnectCore 6 Plus SBC

    • The Micrel PHY KSZ9031 may take between five and six seconds to auto-negotiate with Gigabit switches.

ConnectCore 6

  • i.MX6 system-on-chip

    • NXP i.MX6 processor has a documented errata (ERR004512) whereby the maximum performance of the Gigabit FEC is limited to 400Mbps (total for Tx and Rx).

  • ConnectCore 6 System-on-Module (SOM)

    • Wireless

      • The Qualcomm AR6233 firmware does not support the following configuration modes:

        • Concurrent modes involving P2P mode, such as P2P + softAP or P2P + STA.

        • Bluetooth + softAP + STA concurrent mode.

      • A maximum of five clients are supported when using Qualcomm’s AR6233 in softAP mode.

      • A maximum of ten connected devices are supported when using Qualcomm’s AR6233 Bluetooth Low Energy mode.

  • ConnectCore 6 SBC

    • The Micrel PHY KSZ9031 may take between five and six seconds to auto-negotiate with Gigabit switches.