TQMa8x - YOCTO Linux BSP documentation

Known Issues

Default setting for fdt_file in u-boot does not match older linux kernel naming scheme. Current naming scheme is <cpu>-<som>-<baseboard>[-feature].dtb, old scheme was <cpu>-<baseboard>[-feature].dtb. See Build Artifacts for complete list of supported Device Tree files
counting of i2c devices bus starts at i2c-2 (because i2c-0 and i2c-1 are reserved for i2c_rpmsgbus)
USB
- U-Boot: EHCI timed out on TD - token with some USB sticks on USB 2.0 OTG
- runtime suspend disabled for USB Hub TUSB8041
DT file for rpmsg is too big and needs fdt_high to be set to 0xffffffffffffffff
DP
- Broken resume due to driver issues
- Workaround: disable DP in the Device Tree if system suspend is required:
```
&hdmi {
  status = "disabled";
};
```
SPI: Hardware-controlled chipselects are not driven as expected
- Toggle after each Byte when using DMA
- Inbetween each spi_transfer
- Use of GPIO controlled chip-selects instead is recommended
- By default all chip-selects are configured as GPIO
UBI / UBIFS images are enabled by default when using DISTRO=spaetzle[-nxp]. The generated rootfs size must not exceed the size defined by UBI_LEB_SIZE and UBI_MAX_LEB_COUNT on machine level.