This application note explains how to boot Emcraft i.MX 6SoloX SOM Satrter Kit from ST25P32V6P SPI flash:

• Set the S4 DIP switches to the to boot from NAND (Internal Boot, NAND - default settings).
• Connect the serial Flash dongle to the i.MX 6 SoloX ECSPI5 pins on the baseboard P12 header:

P12 pin	SPI Flash pin
24 (ECSPI5_SS0)	CS
28 (ECSPI5_MISO)	DOUT
21 (ECSPI5_MOSI)	DIN
23 (ECSPI5_SCLK)	CLK
39 (GND)	GND
1 (3V3_RSPB)	VSS



• Make sure Emcraft release images are installed on the SOM.
• Stop at U-Boot prompt and modify DTB as below:

SLX-SOM U-Boot > nand read ${dtb_addr} ${dtb_offset} 0x20000
  NAND read: device 0 offset 0xe00000, size 0x20000
  131072 bytes read: OK
SLX-SOM U-Boot > fdt addr ${dtb_addr}
SLX-SOM U-Boot > fdt set /soc/aips-bus@02200000/ecspi@0228c000/\
m25p32@5 status "okay" 
SLX-SOM U-Boot > fdt rm /soc/aips-bus@02200000/ecspi@0228c000/\
m25p32@5/partition@0 read-only

• Boot the board:

SLX-SOM U-Boot > nand read ${loadaddr} ${uImage_offset} \
${flashsize} && run args addip && bootm ${loadaddr} - ${dtb_addr}

• After booting, SPI board should appear as MTD device (eg mtd6). Erase SPI Flash:

~ # flash_eraseall /dev/mtd6
...
~ #

• Emcraft rootfs image has u-boot.imx image on the root filesystem. Write this image to SPI Flash:

~ # dd of=/dev/mtd6 if=/u-boot.imx bs=1k seek=1
...
~ #

• Turn off the board and set S4 DIP switches 1-8 to On On On Off Off Off On On (Internal Boot, SPI).
• Turn on the board and check booting over serial console.