[U-Boot] [RFC 2/3] ARM,crt0.S: optional init gd to gdata for spl

[Jeroen Hofstee]

The common/spl changes gd to gdata in board_init_f.
I fail to see why. The only reason I can think of to
use the gdata is the case where is won't fit into the
region where the stack lives.

Move the init to crt0.S and make it a CONFIG.
---
 arch/arm/lib/crt0.S | 5 +++++
 arch/arm/lib/spl.c  | 5 ++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
index 98d7881..b8fa10e 100644
--- a/arch/arm/lib/crt0.S
+++ b/arch/arm/lib/crt0.S
@@ -67,9 +67,14 @@ ENTRY(_main)
 	ldr	sp, =(CONFIG_SYS_INIT_SP_ADDR)
 #endif
 	bic	sp, sp, #7	/* 8-byte alignment for ABI compliance */
+
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_GD_GLOBAL)
+	ldr r8, =gdata	/* SPL assigns GD directly to &gdata */
+#else
 	sub	sp, #GD_SIZE	/* allocate one GD above SP */
 	bic	sp, sp, #7	/* 8-byte alignment for ABI compliance */
 	mov	r8, sp		/* GD is above SP */
+#endif
 
 	bl	s_init
 
diff --git a/arch/arm/lib/spl.c b/arch/arm/lib/spl.c
index 583bdb3..52dba2f 100644
--- a/arch/arm/lib/spl.c
+++ b/arch/arm/lib/spl.c
@@ -15,7 +15,9 @@
 
 /* Pointer to as well as the global data structure for SPL */
 DECLARE_GLOBAL_DATA_PTR;
+#ifdef CONFIG_SPL_GD_GLOBAL
 gd_t gdata __attribute__ ((section(".data")));
+#endif
 
 /*
  * In the context of SPL, board_init_f must ensure that any clocks/etc for
@@ -31,9 +33,6 @@ void __weak board_init_f(ulong dummy)
 	/* Clear the BSS. */
 	memset(__bss_start, 0, __bss_end - __bss_start);
 
-	/* Set global data pointer. */
-	gd = &gdata;
-
 	board_init_r(NULL, 0);
 }
 
-- 
1.8.1.2