[U-Boot] [PATCH v3 1/6] ARM1136: Introduce CONFIG_PRELOADER macro.

[Magnus Lilja]

Currently CONFIG_ONENAND_IPL is used in a number of #ifdef's
in start.S. In preparation for adding support for NAND SPL
the macro CONFIG_PRELOADER is introducted and replaces the
CONFIG_ONENAND_IPL in start.S.

Signed-off-by: Magnus Lilja <lilja.magnus at gmail.com>
---
 README                             |    5 +++++
 cpu/arm1136/start.S                |   24 ++++++++++++------------
 onenand_ipl/board/apollon/Makefile |    4 ++--
 3 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/README b/README
index 561c100..86cf628 100644
--- a/README
+++ b/README
@@ -2702,6 +2702,11 @@ Low Level (hardware related) configuration options:
 		some other boot loader or by a debugger which
 		performs these initializations itself.
 
+- CONFIG_PRELOADER
+
+		[ARM only] Modifies the behaviour of start.S when
+		compiling a loader that is executed before the actual
+		U-Boot. E.g. when compiling a NAND SPL.
 
 Building the Software:
 ======================
diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S
index 999b184..28cb5fd 100644
--- a/cpu/arm1136/start.S
+++ b/cpu/arm1136/start.S
@@ -32,7 +32,7 @@
 #include <version.h>
 .globl _start
 _start: b	reset
-#ifdef CONFIG_ONENAND_IPL
+#ifdef CONFIG_PRELOADER
 	ldr	pc, _hang
 	ldr	pc, _hang
 	ldr	pc, _hang
@@ -67,7 +67,7 @@ _not_used:		.word not_used
 _irq:			.word irq
 _fiq:			.word fiq
 _pad:			.word 0x12345678 /* now 16*4=64 */
-#endif	/* CONFIG_ONENAND_IPL */
+#endif	/* CONFIG_PRELOADER */
 .global _end_vect
 _end_vect:
 
@@ -156,9 +156,9 @@ relocate:				/* relocate U-Boot to RAM	    */
 	adr	r0, _start		/* r0 <- current position of code   */
 	ldr	r1, _TEXT_BASE		/* test if we run from flash or RAM */
 	cmp	r0, r1			/* don't reloc during debug	    */
-#ifndef CONFIG_ONENAND_IPL
+#ifndef CONFIG_PRELOADER
 	beq	stack_setup
-#endif	/* CONFIG_ONENAND_IPL */
+#endif	/* CONFIG_PRELOADER */
 
 	ldr	r2, _armboot_start
 	ldr	r3, _bss_start
@@ -175,7 +175,7 @@ copy_loop:
 	/* Set up the stack						    */
 stack_setup:
 	ldr	r0, _TEXT_BASE		/* upper 128 KiB: relocated uboot   */
-#ifdef CONFIG_ONENAND_IPL
+#ifdef CONFIG_PRELOADER
 	sub	sp, r0, #128		/* leave 32 words for abort-stack   */
 #else
 	sub	r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area			    */
@@ -184,14 +184,14 @@ stack_setup:
 	sub	r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
 #endif
 	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
-#endif	/* CONFIG_ONENAND_IPL */
+#endif	/* CONFIG_PRELOADER */
 
 clear_bss:
 	ldr	r0, _bss_start		/* find start of bss segment	    */
 	ldr	r1, _bss_end		/* stop here			    */
 	mov	r2, #0x00000000		/* clear			    */
 
-#ifndef CONFIG_ONENAND_IPL
+#ifndef CONFIG_PRELOADER
 clbss_l:str	r2, [r0]		/* clear loop...		    */
 	add	r0, r0, #4
 	cmp	r0, r1
@@ -244,7 +244,7 @@ cpu_init_crit:
 	mov	lr, ip		/* restore link */
 	mov	pc, lr		/* back to my caller */
 
-#ifndef CONFIG_ONENAND_IPL
+#ifndef CONFIG_PRELOADER
 /*
  *************************************************************************
  *
@@ -357,17 +357,17 @@ cpu_init_crit:
 	.macro get_fiq_stack			@ setup FIQ stack
 	ldr	sp, FIQ_STACK_START
 	.endm
-#endif	/* CONFIG_ONENAND_IPL */
+#endif	/* CONFIG_PRELOADER */
 
 /*
  * exception handlers
  */
-#ifdef CONFIG_ONENAND_IPL
+#ifdef CONFIG_PRELOADER
 	.align	5
 do_hang:
 	ldr	sp, _TEXT_BASE			/* use 32 words about stack */
 	bl	hang				/* hang and never return */
-#else	/* !CONFIG_ONENAND IPL */
+#else	/* !CONFIG_PRELOADER */
 	.align	5
 undefined_instruction:
 	get_bad_stack
@@ -435,4 +435,4 @@ fiq:
 arm1136_cache_flush:
 		mcr	p15, 0, r1, c7, c5, 0	@ invalidate I cache
 		mov	pc, lr			@ back to caller
-#endif	/* CONFIG_ONENAND_IPL */
+#endif	/* CONFIG_PRELOADER */
diff --git a/onenand_ipl/board/apollon/Makefile b/onenand_ipl/board/apollon/Makefile
index 1f996a4..23eee43 100644
--- a/onenand_ipl/board/apollon/Makefile
+++ b/onenand_ipl/board/apollon/Makefile
@@ -4,8 +4,8 @@ include $(TOPDIR)/onenand_ipl/board/$(BOARDDIR)/config.mk
 
 LDSCRIPT= $(TOPDIR)/onenand_ipl/board/$(BOARDDIR)/u-boot.onenand.lds
 LDFLAGS	= -Bstatic -T $(LDSCRIPT) -Ttext $(TEXT_BASE) $(PLATFORM_LDFLAGS)
-AFLAGS	+= -DCONFIG_ONENAND_IPL
-CFLAGS	+= -DCONFIG_ONENAND_IPL
+AFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
+CFLAGS	+= -DCONFIG_PRELOADER -DCONFIG_ONENAND_IPL
 OBJCLFAGS += --gap-fill=0x00
 
 SOBJS	:= low_levelinit.o
-- 
1.5.6