TQMa6x - YOCTO Linux BSP documentation

General

• PCIe requires a power cycle to work reliably. Asserting a POR using S9 or S10 is not sufficient.
• UBI / UBIFS images are enabled by default when using DISTRO=spaetzle. The values for UBI_LEB_SIZE and UBI_MAX_LEB_COUNT are predefined for 64 MiB SPI-NOR. The generated UBIFS does not fit into the default SPI-NOR (16 MiB). If rootfs on SPI NOR is required, following solutions:
  • tailor image recipe and kernel configuration to get real tiny
  • use SoM variant with larger SPI-NOR
• Backlight on parallel displays are enabled upon Power-On which might lead to random output. Display will be disabled during bootup and can be used normally afterwards.

U-Boot

• FEC Ethernet port may have ARP timeouts. Restart the network command usually fixes the issue. Root cause is ethernet PHY on MBa6x.
• USB Ethernet (LAN9500 / X12C) is only usable after usb start and with valid MAC in eth1addr environment variable. Default value is parsed from EEPROM on MBa6x. To select the device, set ethact to the devicename. The name can be determined using dm tree and look for the device name.
• MTD and UBI Support are not configured. Only U-Boot and environment on SPI NOR are supported by built U-Boot configuration..
• USB dual role port (X8) is tested in U-Boot in peripheral mode only.
• Setting and clearing of several GPIOs (e.g. for user LEDs) is not working. Workaround: enable GPIO_LED support and other releated settings. Will be fixed in next release.