How to use QSPI for M7 on i.MX 8M Plus EVK

[ericnelsonaz]

Hi all,

I'm having trouble getting started using the i.MX 8M Plus EVK with QSPI NOR.

I've found instructions on how to flash the 8M Mini using "uuu -b qspi firmware.bin", but this doesn't appear to work on 

My EVK seems to have come with a boot image loaded into the NOR flash:

u-boot=> sf probe 
SF: Detected n25q256ax1 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
u-boot=> sf read $loadaddr 0 0x100
device 0 offset 0x0, size 0x100
SF: 256 bytes @ 0x0 Read: OK
u-boot=> md $loadaddr
40400000: 412000d1 007e1000 0005fc00 00000000  .. A..~.........
40400010: 007e0fe0 007e0fc0 0080b7c0 00000000  ..~...~.........
40400020: 007e0bc0 0002cc00 00000000 00000000  ..~.............
40400030: 00000000 00000000 00000000 00000000  ................
40400040: 1400000a d503201f 40200000 00000000  ..... .... @....

Is there an app note regarding how to flash and start the M7 with code in QSPI?

[ericnelsonaz]

I figured it out...

After programming the .bin file to the flash, issuing these commands in U-Boot allow the M7 hello_world app to run:

u-boot=> sf probe
SF: Detected n25q256ax1 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
u-boot=> bootaux 0x08000000
## No elf image at address 0x08000000
## Starting auxiliary core stack = 0x20020000, pc = 0x0800048D...

And I see "hello world." on UART4 (/dev/ttyUSB3).

[ericnelsonaz · Accepted solution]

I programmed the flash with flash_debug/hello_world.bin at offset 0.

u-boot=> load mmc 1 $loadaddr hello_world.bin
18664 bytes read in 4 ms (4.4 MiB/s)
u-boot=> sf probe
SF: Detected n25q256ax1 with page size 256 Bytes, erase size 4 KiB, total 32 MiB
u-boot=> sf erase 0 0x5000
SF: 20480 bytes @ 0x0 Erased: OK
u-boot=> sf write $loadaddr 0 $filesize
device 0 offset 0x0, size 0x48e8
SF: 18664 bytes @ 0x0 Written: OK