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# fdt示例 #
在`examples`文件夹中存放`bcm2711-rpi-4-b.dtb`和`vexpress-v2p-ca9.dtb`可供测试，如果系统可以从bootloader或其他方式获取到bsp本身的dtb，也可以通过修改示例程序进行测试
## fdt_dump
```bash
fdt_dump vexpress-v2p-ca9.dtb
```
#### 示例结果 ####
```bash
/dts-v1/;
/ {
model = "V2P-CA9";
arm,hbi = <0x191>;
arm,vexpress,site = <0xf>;
compatible = "arm,vexpress,v2p-ca9", "arm,vexpress";
interrupt-parent = <0x1>;
#address-cells = <0x1>;
#size-cells = <0x1>;
chosen {
};
aliases {
serial0 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@9000";
serial1 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@a000";
serial2 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@b000";
serial3 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@c000";
i2c0 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@16000";
i2c1 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@2000";
};
...... 省略
hsb@e0000000 {
compatible = "simple-bus";
#address-cells = <0x1>;
#size-cells = <0x1>;
ranges = <0x0 0xe0000000 0x20000000>;
#interrupt-cells = <0x1>;
interrupt-map-mask = <0x0 0x3>;
interrupt-map = <0x0 0x0 0x1 0x0 0x24 0x4 0x0 0x1 0x1 0x0 0x25 0x4 0x0 0x2 0x1 0x0 0x26 0x4 0x0 0x3 0x1 0x0 0x27 0x4>;
};
};
```
## fdt_test
```bash
fdt_test
```
#### 示例结果 ####
```bash
name = uart@9000
reg = <0x9000,0x1000>;
compatible = "arm,pl011","arm,primecell";
name = cpus
path = /cpus/cpu@0/
path = /cpus/cpu@1/
path = /cpus/cpu@2/
path = /cpus/cpu@3/
name = user1, lable = v2m:green:user1
name = user2, lable = v2m:green:user2
name = user3, lable = v2m:green:user3
name = user4, lable = v2m:green:user4
name = user5, lable = v2m:green:user5
name = user6, lable = v2m:green:user6
name = user7, lable = v2m:green:user7
name = user8, lable = v2m:green:user8
/memreserve/ 0x0000000000000000 0x0000000000001000;
phandle = <0x9>
name = bt_pins
path = /soc/gpio@7e200000/bt_pins/
brcm,pins = [2d 00]
```
|
