配置UART/串行接口：
-没有log通过串行端口发送
-禁用shell
sdx12-ap/poky/meta/recipes-core/systemd/systemd-serialgetty.bb
diff --git a/sdx12-ap/poky/meta/recipes-core/systemd/systemd-serialgetty.bb b/sdx12-ap/poky/meta/recipes-core/systemd/systemd-serialgetty.bb
old mode 100644
new mode 100755
index 1137b31..8d7e6a9
--- a/sdx12-ap/poky/meta/recipes-core/systemd/systemd-serialgetty.bb
+++ b/sdx12-ap/poky/meta/recipes-core/systemd/systemd-serialgetty.bb
@@ 
