pin - zivku/MPU GitHub Wiki

UART

 cd buildroot-at91/output/build/linux-custom/arch/arm/boot/dts

```
 vim at91-sama5d27_som1_ek.dts
```
預設的UART2如下圖所示 :
```
 vim sama5d2-pinfunc.h
```
文件定義另一組同屬於UART2的為PD23與PD24 如下圖 :
重新編譯kernel
```
 sudo rm .stamp_built
```
```
 sudo rm .stamp_target_installed
```

重新make

SPI

 cd /buildroot-at91/output/build/linux-custom/arch/arm/boot/dts

```
 vim at91-sama5d27_som1_ek.dts
```

新增下列內容 :

 cd /buildroot-at91/output/build/linux-custom/drivers/spi

```
 vim spidev.c
```

新增下列內容 :

```
 cd buildroot-at91
```
```
 make linux-menuconfig
```
Device Drivers ->enter
SPI support->enter
User mode SPI device driver support-> 空白鍵切換至<*> -> Save -> Exit
重新編譯kernel :
```
cd buildroot-at91
```
```
make linux-rebuild
```
```
make dt-overlay-mchp-rebuild
```
```
make
```

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