I have a question regarding iMX6 boot from SPI flash. If you look to MCIMX6Q-SDB schematics, you will find the following pin connection for SPI NOR flash (only 2 lines as example):
SPINOR_CLK --->>> KEY_COL0 [W5] . ALT0 = ECSPI1_CLK
SPINOR_MISO --->>> KEY_COL1 [U7] . ALT0 = ECSPI1_MISO
However, according to RM "Table 8-25. SPI IOMUX Pin Configuration", or DS "Boot Devices Interfaces Allocation", booting from ECSPI1 is possible if connected to EIM_D17.alt1, EIM_D18.alt1, etc...
Does that mean that MCIMX6Q-SDB is not able to boot from onboard SPI NOR flash?
Or does boot ROM look to alternative pin options as well?