The following table lists the U-Boot file associated with each ConnectCore 8M Mini variant:

RAM size U-Boot file U-Boot defconfig

any

imx-boot-ccimx8mm-dvk.bin-flash_evk

ccimx8mm_dvk_defconfig

Check your variant RAM size on the serial console boot log:

U-Boot SPL dub-2020.04-r6.1 (Sep 19 2023 - 07:19:27 +0000)
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3000MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
Normal Boot
Trying to boot from MMC2
NOTICE:  BL31: v2.4(release):lf-5.10.72-2.2.3-2-gb67eb4618
NOTICE:  BL31: Built : 07:19:48, Sep 19 2023


U-Boot dub-2020.04-r6.1 (Sep 19 2023 - 07:19:27 +0000)

CPU:   i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 32C
Reset cause: POR
DRAM:  2 GiB
MCA:   HW_VER=1  FW_VER=1.00
MMC:   FSL_SDHC: 1, FSL_SDHC: 0
In:    serial
Out:   serial
Err:   serial
Model: Digi ConnectCore 8M Mini Development Kit
ConnectCore 8M Mini SOM variant 0x03: 2 GiB LPDDR4, Wi-Fi, Bluetooth, MCA, Crypto-auth
  Board version 3, ID undefined
Boot:  MMC2

 BuildInfo:
  - ATF b67eb46
  - U-Boot dub-2020.04-r6.1

flash target is MMC:0
Net:   eth0: ethernet@30be0000
Fastboot: Normal
Normal Boot
Hit any key to stop autoboot:  0
=> 

U-Boot might show less DRAM than the nominal. This is due to elements such as the secure monitor (OP-TEE) reserving part of the memory.