81 lines
2.2 KiB
Markdown
81 lines
2.2 KiB
Markdown
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# fdt示例 #
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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
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## fdt_dump
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```bash
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fdt_dump vexpress-v2p-ca9.dtb
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```
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#### 示例结果 ####
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```bash
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/dts-v1/;
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/ {
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model = "V2P-CA9";
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arm,hbi = <0x191>;
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arm,vexpress,site = <0xf>;
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compatible = "arm,vexpress,v2p-ca9", "arm,vexpress";
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interrupt-parent = <0x1>;
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#address-cells = <0x1>;
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#size-cells = <0x1>;
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chosen {
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};
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aliases {
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serial0 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@9000";
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serial1 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@a000";
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serial2 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@b000";
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serial3 = "/smb@4000000/motherboard/iofpga@7,00000000/uart@c000";
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i2c0 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@16000";
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i2c1 = "/smb@4000000/motherboard/iofpga@7,00000000/i2c@2000";
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};
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...... 省略
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hsb@e0000000 {
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compatible = "simple-bus";
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#address-cells = <0x1>;
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#size-cells = <0x1>;
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ranges = <0x0 0xe0000000 0x20000000>;
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#interrupt-cells = <0x1>;
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interrupt-map-mask = <0x0 0x3>;
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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>;
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};
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};
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```
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## fdt_test
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```bash
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fdt_test
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```
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#### 示例结果 ####
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```bash
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name = uart@9000
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reg = <0x9000,0x1000>;
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compatible = "arm,pl011","arm,primecell";
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name = cpus
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path = /cpus/cpu@0/
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path = /cpus/cpu@1/
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path = /cpus/cpu@2/
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path = /cpus/cpu@3/
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name = user1, lable = v2m:green:user1
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name = user2, lable = v2m:green:user2
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name = user3, lable = v2m:green:user3
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name = user4, lable = v2m:green:user4
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name = user5, lable = v2m:green:user5
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name = user6, lable = v2m:green:user6
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name = user7, lable = v2m:green:user7
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name = user8, lable = v2m:green:user8
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/memreserve/ 0x0000000000000000 0x0000000000001000;
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phandle = <0x9>
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name = bt_pins
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path = /soc/gpio@7e200000/bt_pins/
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brcm,pins = [2d 00]
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```
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