Summary:
The i.MX 8M-Mini can boot from QSPI flash using a dedicated boot image.
The boot config settings are not correctly documented in the EVK Board Hardware User's Guide Rev 0 from 02/2019.
In the document i.MX_Linux_User's_Guide.pdf in the BSP documentation 4.14.98 the settings are correctly given in Table 38
Details:
- To generate a bootable file for the QSPI with Yocto, you need to include the following setting into local.conf:
UBOOT_CONFIG = "fspi"
If you don't want/need to make a complete build, just rebuild u-boot:
bitbake -c deploy u-boot-imx - Alternatively the file imx-boot-imx8mmevk-fspi.bin-flash_evk_flexspi included already in the BSP demo packages will work as well
- Program the image into QSPI:
With UUU: uuu -b qspi imx-boot-imx8mmevk-fspi.bin-flash_evk_flexspi
With u-boot:
u-boot=> fatls mmc 0:1
14557696 Image
…
1446848 imx-boot-imx8mmevk-fspi.bin-flash_evk_flexspi
11 file(s), 0 dir(s)
u-boot=> sf probe
SF: Detected n25q256a with page size 256 Bytes, erase size 4 KiB, total 32 MiB
u-boot=> fatload mmc 0:1 0x40480000 imx-boot-imx8mmevk-fspi.bin-flash_evk_flexspi
1446848 bytes read in 79 ms (17.5 MiB/s)
u-boot=> sf erase 0x0 0x200000
SF: 2097152 bytes @ 0x0 Erased: OK
u-boot=> sf write 0x40480000 0x0 0x200000
device 0 offset 0x0, size 0x200000
SF: 2097152 bytes @ 0x0 Written: OK
u-boot=> sf read 0x50000000 0x0 0x200000
device 0 offset 0x0, size 0x200000
SF: 2097152 bytes @ 0x0 Read: OK
u-boot=> cmp.b 0x40480000 0x50000000 0x200000
Total of 2097152 byte(s) were the same
u-boot=>
- Set boot config jumpers correctly and power on the board (no SD-card in the slot)
8M-Mini Rev A and Rev B boards: 01xxxxx0
0000x001
8M-Mini Rev C boards:0110xxxxxx
00100x0010
