leon3: avoid dependency on apbuart/timer driver

Moves drvmgr_drivers[] from amba.c to a separate file in order
to avoid the dependecy on APBUART/GPTIMER drivers. This has
an effect when user configured not to use timer or uart
in their project.

bsps/sparc/leon3/start/amba.c

@@ -34,18 +34,6 @@ struct ambapp_bus ambapp_plb;
 #include <drvmgr/drvmgr.h>
 #include <grlib/ambapp_bus_grlib.h>
 
-extern void gptimer_register_drv (void);
-extern void apbuart_cons_register_drv(void);
-/* All drivers included by BSP, this is overridden by the user by including
- * the drvmgr_confdefs.h. By default the Timer and UART driver are included.
- */
-drvmgr_drv_reg_func drvmgr_drivers[] __attribute__((weak)) =
-{
-  gptimer_register_drv,
-  apbuart_cons_register_drv,
-  NULL /* End array with NULL */
-};
-
 /* Driver resources configuration for AMBA root bus. It is declared weak
  * so that the user may override it, if the defualt settings are not
  * enough.

bsps/sparc/leon3/start/drvmgr_def_drivers.c

@@ -0,0 +1,28 @@
+/*
+ *  Default BSP drivers when Driver Manager enabled
+ *
+ *  COPYRIGHT (c) 2019.
+ *  Cobham Gaisler
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+#include <bsp.h>
+
+#ifdef RTEMS_DRVMGR_STARTUP
+#include <drvmgr/drvmgr.h>
+
+extern void gptimer_register_drv (void);
+extern void apbuart_cons_register_drv(void);
+/* All drivers included by BSP, this is overridden by the user by including
+ * the drvmgr_confdefs.h. By default the Timer and UART driver are included.
+ */
+drvmgr_drv_reg_func drvmgr_drivers[] __attribute__((weak)) =
+{
+  gptimer_register_drv,
+  apbuart_cons_register_drv,
+  NULL /* End array with NULL */
+};
+
+#endif

c/src/lib/libbsp/sparc/leon3/Makefile.am

@@ -39,6 +39,7 @@ librtemsbsp_a_SOURCES += ../../../../../../bsps/shared/start/bspreset-empty.c
 librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon3/start/cpucounter.c
 librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/shared/start/bsp_fatal_exit.c
 librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon3/start/bsp_fatal_halt.c
+librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon3/start/drvmgr_def_drivers.c
 
 # gnatsupp
 librtemsbsp_a_SOURCES += ../../../../../../bsps/sparc/leon3/gnatsupp/gnatsupp.c

spec/build/bsps/sparc/leon3/obj.yml

@@ -48,6 +48,7 @@ source:
 - bsps/sparc/leon3/start/bspstart.c
 - bsps/sparc/leon3/start/cache.c
 - bsps/sparc/leon3/start/cpucounter.c
+- bsps/sparc/leon3/start/drvmgr_def_drivers.c
 - bsps/sparc/leon3/start/eirq.c
 - bsps/sparc/leon3/start/setvec.c
 - bsps/sparc/leon3/start/spurious.c