FAQ_MA35D1_IoT Board Modify Reserved-Memory

[yhcheng3]

Question :

IoT Board Modify Reserved-Memory


Answer.

Because the IoT Board does not use display-related content, you can remove the display-related content in the device tree and add reserved-memory.

Currently, the reserved-memory of 128M is 19980k, and the reserved-memory of 512M is 117404K.

Delete display-related content from reserved-memory in the device tree: output/build/linux-custom/arm64/boot/dts/nuvoton/ma35d1.dtsi

Code: Select all

reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;
		display_buf: display_buf@0 {
			reg = <0x0 0x8C800000 0x0 0x3000000>; /*48MiB*/
			no-map;
		};
		vc8k_buf: vc8k_buf@0 {
			reg = <0x0 0x8A800000 0x0 0x2000000>; /*32MiB*/
			no-map;
		};
		gc520l_buf: gc520l_buf@0 {
			reg = <0x0 0x8A000000 0x0 0x800000>; /*8MiB*/
			no-map;
		};
		rproc_buf: rproc_buf@0 {
			reg = <0x0 0x80020000 0x0 0x60000>; /*384KB*/
			no-map;
		};
	};

Modify to

Code: Select all

reserved-memory {
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;

		rproc_buf: rproc_buf@0 {
			reg = <0x0 0x80020000 0x0 0x60000>; /*384KB*/
			no-map;
		};
	};

Also need to modify the kernel Makefile: output/build/linux-custom/arch/arm64/boot/dts/nuvoton/Makefile
Put the following content:

Code: Select all

# SPDX-License-Identifier: GPL-2.0
dtb-$(CONFIG_ARCH_MA35D1)    += ma35d1-iot-128m.dtb \
				ma35d1-iot-256m.dtb \
				ma35d1-iot-512m.dtb \
				ma35d1-som-256m.dtb \
				ma35d1-som-512m.dtb \
				ma35d1-som-1g.dtb

always          := $(dtb-y)
clean-files     := *.dtb

Modify to

Code: Select all

# SPDX-License-Identifier: GPL-2.0
dtb-$(CONFIG_ARCH_MA35D1)    += ma35d1-iot-512m.dtb  
	
always          := $(dtb-y)
clean-files     := *.dtb

#MA35D1, #IoT, #Reserved-Memory
.