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I.MX6ull-test-board

自制的i.mx6ull测试板,用于对电路功能进行验证,目前已经打样焊接测试功能准确无误。

目前具有的功能

  1. 网口ETH2正常,可以正常使用TFTP下载内核镜像和设备树,使用nfs挂载根文件系统
  2. UART1连接CH340N,使用USBMini-A连接PC终端软件

制作过程中遇到的问题

BTB附近的磁珠电路无效

在实际焊接过程中发现L2磁珠靠近CORE_5V端电压一直在波动,最后为了给核心板供电,选择将L2短路,VCC_5V直接接入核心板。

能识别PHY芯片但是无法ping通

我发现在uboot阶段无法通过TFTP下载内核镜像和设备树,后面对I.MX6u底板BTB接口重新加锡焊接,解决了这个问题,如果再次遇到还是要先检查硬件焊接。SMT可以跳过此步骤。

原有模块无法加载

/lib/modules/4.1.15 # modprobe gpioled.ko
gpioled: disagrees about version of symbol device_create
gpioled: Unknown symbol device_create (err -22)
gpioled: disagrees about version of symbol device_destroy
gpioled: Unknown symbol device_destroy (err -22)
gpioled: disagrees about version of symbol device_create
gpioled: Unknown symbol device_create (err -22)
gpioled: disagrees about version of symbol device_destroy
gpioled: Unknown symbol device_destroy (err -22)
modprobe: can't load module gpioled.ko (gpioled.ko): Invalid argument

解决核心**内核版本与模块版本不一致造成,更改版本一致即可解决

如上所示的gpioled.ko模块,在Ubuntu中重新编译发送到开发板根文件系统后可以正常加载。

解决disagrees about version of symbol device_create_CinzWS的博客-CSDN博客

制作参考

正点原子IMX6ULL_ALPHA_V2.2(底板原理图).pdf

正点原子IMX6ULL_ALPHA_V2.4(底板原理图).pdf

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