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How to change DRAM size in U-Boot (Yocto - iMX6ULLEVK)

Question asked by Andrea Compagni on Jun 3, 2019
Latest reply on Sep 2, 2019 by gusarambula

Hello everyone,
I have a custom board based on iMX6ull14x14evk, but with 256MB of RAM.


I'm using yocto for iMX6, i'm able to compile and flash the sd card, but I can't change the DRAM size from 512 to 256 MB.


I have tried to modify "mx6ullevk.h" file changing phys dram size define as follows

 #define PHYS_SDRAM_SIZE    SZ_256M


But when I boot the board the size doesn't change:


CPU: Freescale i.MX6ULL rev1.0 528 MHz (running at 396 MHz)
CPU: Commercial temperature grade (0C to 95C) at 38C
Reset cause: POR
Model: Freescale i.MX6 ULL 14x14 EVK Board
Board: MX6ULL 14x14 EVK
DRAM: 512 MiB
*** Warning - bad CRC, using default environment


Is there a guide I can follow that shows how to correctly patch the files?

Thank you