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FAQ

FAQ

Build a custom DDR to image by Buildroot  Issue Date：2025-03-03

If you're working with an MA35D1 and you want to use an external DDR, you may find that the BSP only includes a limited set of DDR parameters.

To address this issue, you can replace the existing "custom_ddr.h" header file with a new one that contains the necessary information.

To do this, you can copy the new "custom_ddr.h" file to the following path on your MA35D1 Buildroot project:
~/shared/buildroot/test_MA35D1/MA35D1_Buildroot/board/nuvoton/ma35d1/ddr/custom_ddr.h
Modify the DDR configuration to yours and the following sample use 1G DDR.
$ make menuconfig
Kernel --->
(nuvoton/ma35d1-som-1g) In-tree Device Tree Source file names

Bootloaders --->
In-tree Device Tree Source file names (ma35d1-cpu800-custom-ddr) --->
(custom_ddr.h) Custom DDR header file in board/nuvoton/ma35d1/ddr
(0x40000000) Custom DDR size
After modify the configuration, rebuild uboot, optee-os, tf-a and repack it.
$ make uboot-rebuild && make optee-os-rebuild && make arm-trusted-firmware && make
By doing so, you'll ensure that the MA35D1 board uses the updated DDR parameters.
Products: Microprocessors ,Arm Cortex-A35 MPUs ,MA35D1 High-Performance Edge IIoT Series
Applications:
Function: Others,Buildroot,DDR

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