We are trying to get working our diy IMX6ULL based pcb.
Reference design of NXP taken as based for board.
We are unable to make it working - nothing on UART.
It should start from onboard SPI flash which contain embedded linux image that works fine on development board.
SPI flash soldered preloaded with image.
Using oscilloscope I see that:
- VDD_HIGH_IN = 3.3V
- NVCC_CSI = 3.3V
- VDDA_ADC_3P3 = 3.3V
- NVCC_SD = 3.3V
- VDD_ARM_SOC_IN = 3.3V
- VDD_DRAM = 1.38V
- PMIC_ON_REQ = 3.0V
- ONOFF = 3.0V
- I see oscillation on XTALO:
But PMIC_STBY_REQ remains in 0V.
What are the possible issues can be here?
TEST_MODE connected to GND
BOOT_MODE1 = 3.0V
BOOT_MODE0 = 0V
LCD_DATA_4, LCD_DATA_5 and LCD_DATA_11 pulled up to 3.3V, all other LCD pins pulled down to achieve booting from QSPI which connected to onboard SPI flash IC using ECSPI1_CLK (CSI_DATA04), ECSPI1_SS0 (CSI_DATA05), ECSPI1_MOSI (CSI_DATA06), ECSPI1_MISO (CSI_DATA07).