bsp/nxp：Separate nxp_imx library

Author: hydevcode

bsp/nxp/imx/imx6sx/cortex-a9/Kconfig

@@ -15,6 +15,7 @@ config SOC_MCIMX6X4
     bool
     select RT_USING_COMPONENTS_INIT
     select RT_USING_USER_MAIN
+    select PKG_USING_NXP_IMX6SX_DRIVER
     default y
 
 config RT_USING_UART1

bsp/nxp/imx/imx6sx/cortex-a9/SConstruct

@@ -10,6 +10,23 @@ else:
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
+def bsp_pkg_check():
+    import subprocess
+
+    check_paths = [
+        os.path.join("packages", "nxp-imx6sx-sdk-latest"),
+    ]
+
+    need_update = not all(os.path.exists(p) for p in check_paths)
+
+    if need_update:
+        print("\n==============================================================")
+        print("Dependency packages missing, please running 'pkgs --update'...")
+        print("==============================================================")
+        exit(1)
+
+RegisterPreBuildingAction(bsp_pkg_check)
+
 TARGET = 'rtthread-imx6.' + rtconfig.TARGET_EXT
 
 DefaultEnvironment(tools=[])
@@ -27,7 +44,5 @@ Export('rtconfig')
 # prepare building environment
 objs = PrepareBuilding(env, RTT_ROOT,has_libcpu=True)
 
-objs += SConscript('../iMX6_Platform_SDK/SConscript', variant_dir='build/iMX6_Platform_SDK/SConscript', duplicate=0)
-
 # make a building
 DoBuilding(TARGET, objs)