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yocto编译AM335x Starter Kit系统,运行时屏幕不亮



我搭建了一个yocto的编译环境,使用git://git.yoctoproject.org/meta-ti

local.conf中配置MACHINE ??= "am335x-evm",然是用bitbake core-image-sato编译的系统,烧录到SD卡上后,LCD屏不亮

内核版本为Linux4.4.11,yocto使用beaglebone-krogoth-15.0.0

开发板是官方的TMDSSK3358

硬件是没有问题的,因为用ti-processor-sdk-linux-am335x-evm-02.00.02.11-Linux-x86-Install.bin 编译的系统,运行时触摸屏运行完全正常

哪位能否解答下?多谢