You can boot from SPI NOR Flash using the following procedure:
1 - Download ATK Release 1.7. The version ATK 1.7 can be downloaded here.
2 - Unzip file iMX_AdvancedToolKit_R170.zip into "C:\Program Files\freescale\AdvancedToolKit-STD\image\".
3 - Open the file "C:\Program Files\freescale\AdvancedToolKit-STD\config\ADSToolkit.cfg" and add the following lines:
4 - Set the SPI Boot Config on MX25PDK:
SW22: no influence
BT_MEM_CTL[0:1] = 11 (Expansion)
BT_MEM_TYPE[0:1] = 11 (Serial ROM via SPI)
BT_PAGE_SIZE[0:1] = no influence
BT_BUS_WIDTH[0:1] = 10 (3-Address SPI (24-bit) Note: BT_BUS_WIDTH=1, BT_BUS_WIDTH=0
On Debug Board the red switches:
(SW5-SW10) = 000011 (0=off)
Boot Config Switches (SW21, SW22) on Personality Board have no influence.
5 - Connect USB or Serial cable between Host PC and PDK and execute ATK
6 - Select USB/UART serial boot on MX25PDK and power on the board
7 - Configure ATK as following:
Device = i.MX25_TO1.1
device memory initial = DDR2
Communication channel: COMn (select the COM port on your PC)
Communication channel: USB
If you choose COM (serial UART connection) you MUST disconnect USB cable from OTG connector on i.MX25 PDK.
8 - Configure ATK "Flash Tool" as following:
Tick "Read Back Check"
Flash Model = SPI
Address = 0x0
Image = mx25_3stack_redboot_TO1_1.bin (same file as for NAND boot).
Same should be applicable to U-boot.
Note: SPI NOR Boot requires internal boot mode. On Debug Card all red switches must be off
(SW5-SW10) = 000000 (0=off).
Note: if booting from SPI NOR, Redboot needs approx 2 seconds before it shows messages on the console.