The ROM expects the QuadSPI configuration parameters (as explained in the QuadSPI
Configuration Parameters) to be present in the serial flash memory from the offset 0x400
of serial flash of length 368 bytes. The ROM reads these configuration parameters using
the default read command configured in the LUT of the QuadSPI interface with the
SCLOCK operating at 18 MHz.
(IMX6SXRM.pdf - page 408)
My system is based on I.MX6SX.
I set BOOT_CFG1[7:4] to 0001 and BOOT_CFG1 to 0, so expected QSPI1 SCLK 18MHz, but there is no signal on the pin.
Is there another requirement for QSPI booting?