The following table lists the U-Boot file associated with each ConnectCore 91 variant:

RAM size U-Boot file U-Boot defconfig

any

imx-boot-ccimx91-dvk.bin-flash_singleboot

ccimx91-dvk_defconfig

Check your RAM size on the serial console boot log:

U-Boot SPL dub-2024.04-r2.2+g9218b07cddd+p0 (Feb 24 2025 - 15:03:53 +0000)
SOC: 0xa0009100
LC: 0x2040010
PMIC: PCA9451A
PMIC: Nominal Voltage Mode
DDR: 2400MTS
Normal Boot
Trying to boot from BOOTROM
Boot Stage: Primary boot
image offset 0x0, pagesize 0x200, ivt offset 0x0
Load image from 0x41800 by ROM_API
NOTICE:  TRDC init done
NOTICE:  BL31: v2.10.0  (release):android-15.0.0_1.0.0-rc3-0-g1b27ee3ed-dirty
NOTICE:  BL31: Built : 15:03:53, Feb 24 2025

U-Boot dub-2024.04-r2.2+g9218b07cddd+p0 (Feb 24 2025 - 15:03:53 +0000)
Reset Status: POR
CPU:   NXP i.MX91(31) Rev1.0 A55 at 1400 MHz
CPU:   Industrial temperature grade  (-40C to 105C) at 30C
DRAM:  480 MiB
Core:  196 devices, 28 uclasses, devicetree: separate
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Model: Digi ConnectCore 91 Development Kit
ConnectCore 91 SOM variant 0x01: 480 MiB LPDDR4, Wi-Fi, Bluetooth
 Board version 1, ID undefined
Boot:  MMC0
BuildInfo:
 - ELE firmware version 2.0.0-64d8ef47
flash target is MMC:0
Net:   eth0: ethernet@428a0000 [PRIME]
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.