arm: spl: Avoid setting up a duplicate global data structure

This is already set up in crt0.S. We don't need a new structure and don't
really want one in the 'data' section of the image, since it will be empty
and crt0.S's changes will be ignored.

As an interim measure, remove it only if CONFIG_DM is not defined. This
allows us to press ahead with driver model in SPL and allow the stragglers
to catch up.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/spl.h

@@ -37,6 +37,8 @@ void spl_board_load_image(void);
 /* Linker symbols. */
 extern char __bss_start[], __bss_end[];
 
+#ifndef CONFIG_DM
 extern gd_t gdata;
+#endif
 
 #endif

arch/arm/lib/spl.c

@@ -13,6 +13,7 @@
 #include <image.h>
 #include <linux/compiler.h>
 
+#ifndef CONFIG_DM
 /* Pointer to as well as the global data structure for SPL */
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -21,6 +22,7 @@ DECLARE_GLOBAL_DATA_PTR;
  * pafches that rely on it. The global_data area is set up in crt0.S.
  */
 gd_t gdata __attribute__ ((section(".data")));
+#endif
 
 /*
  * In the context of SPL, board_init_f must ensure that any clocks/etc for
@@ -33,8 +35,10 @@ void __weak board_init_f(ulong dummy)
 	/* Clear the BSS. */
 	memset(__bss_start, 0, __bss_end - __bss_start);
 
+#ifndef CONFIG_DM
 	/* TODO: Remove settings of the global data pointer here */
 	gd = &gdata;
+#endif
 
 	board_init_r(NULL, 0);
 }