TQMa64xxL - YOCTO Linux BSP documentation

• In U-Boot, USB functions are limited:
  • USB 3.0 is disabled in U-Boot, only USB 2.0 is available
  • The OTG ID pin is ignored in U-Boot. The mode of the port is determined by the boot mode:
    • When booting in USB host mode (from mass storage), the port uses host mode. Access to the connected USB storage device is possible from the U-Boot command line.
    • For all other boot modes, the port will be in device mode. The "dfu" command can be used to flash the boot media from a connected host.
• In U-Boot, there is no PRU Ethernet support. Only the primary Ethernet port X5 is usable in the bootloader.
• From U-Boot, most GPIOs can't be read or set, as they are disabled in the default pinmuxing. This also affects LED and button GPIOs. LEDs and buttons are working as expected on Linux.
• There is currently no driver support for the Bluetooth module of the MBaX4XxL.
• In rare cases, the USB3 PHY initialization has been observed to fail with the message "Timeout waiting for CMN ready" during boot, leaving the USB controller unusable. A power cycle is necessary to recover from this state.
• On variants with only a single R5 core (TQMa6412L, TQMa6411L), booting R5 programs and communicating with them using the Linux remoteproc/rpmsg drivers is currently unsupported.
• The AM64x currently doesn't support Suspend-to-RAM

PRU Gigabit Ethernet

There is a regression in scarthgap.TQ.ARM.BSP.0005 which prevents that the PRU firmware can be loaded properly during system start.
As workaround meta-tq and meta-ti have to be updated to the following commit ids