FAQ_MA35D1 Build a Custom DDR to Image by Buildroot

[ytliu6]

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:

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~/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.

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$ 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.

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$ make uboot-rebuild && make optee-os-rebuild && make linux-rebuild && make arm-trusted-firmware && make

By doing so, you'll ensure that the MA35D1 board uses the updated DDR parameters.