nor-bootmenu.patch

Uboot常用的移植patches, 方便定制移植到s3c2440

This patch makes u-boot on GTA02 always enter the bootmenu when booting from
NOR. This de-complexifies interaction with the user and is actually also 
needed for correctly handling the exception vectors.

- cpu/arm920t/start.S (booted_from_nor): set this flag if booting from NOR
- board/neo1973/gta02/gta02.c (board_late_init): always enter the boot menu if
  booting from NOR
- board/neo1973/gta02/gta02.c (board_late_init): used the opportunity to place
  the "extern"s at a more prominent location

Index: u-boot/board/neo1973/gta02/gta02.c
===================================================================
--- u-boot.orig/board/neo1973/gta02/gta02.c
+++ u-boot/board/neo1973/gta02/gta02.c
@@ -216,8 +216,10 @@ int board_init(void)
 
 int board_late_init(void)
 {
-	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 	extern unsigned char booted_from_nand;
+	extern unsigned char booted_from_nor;
+
+	S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
 	uint8_t int1, int2;
 	char buf[32];
 	int menu_vote = 0; /* <= 0: no, > 0: yes */
@@ -250,7 +252,7 @@ int board_late_init(void)
 	/* if there's no other reason, must be regular reset */
 	neo1973_wakeup_cause = NEO1973_WAKEUP_RESET;
 
-	if (!booted_from_nand)
+	if (!booted_from_nand && !booted_from_nor)
 		goto woken_by_reset;
 
 	/* save wake-up reason in environment */
@@ -310,11 +312,13 @@ continue_boot:
 	}
 #endif
 
-	if (menu_vote > 0) {
+	if (menu_vote > 0 || booted_from_nor) {
 		extern struct bootmenu_setup bootmenu_setup;
 
 		if (booted_from_nand)
 			bootmenu_setup.comment = "NAND";
+		if (booted_from_nor)
+			bootmenu_setup.comment = "NOR";
 		neo1973_bootmenu();
 		nobootdelay = 1;
 	}
Index: u-boot/cpu/arm920t/start.S
===================================================================
--- u-boot.orig/cpu/arm920t/start.S
+++ u-boot/cpu/arm920t/start.S
@@ -106,6 +106,16 @@ _booted_from_nand:
 	.word	booted_from_nand
 #endif /* CONFIG_S3C2410_NAND_BOOT */
 
+#ifndef CFG_NO_FLASH
+.globl booted_from_nor
+booted_from_nor:
+	.word	0
+_booted_from_nor:
+	.word	booted_from_nor
+_end_if_0:
+	.word	__bss_start-_start
+#endif /* !CFG_NO_FLASH */
+
 _TEXT_BASE:
 	.word	TEXT_BASE
 
@@ -387,6 +397,15 @@ copy_loop:
 	stmia	r1!, {r3-r10}		/* copy to   target address [r1]    */
 	cmp	r0, r2			/* until source end address [r2]    */
 	ble	copy_loop
+
+#ifndef CFG_NO_FLASH
+	ldr	r0, _end_if_0		/* are we booting from NOR ? */
+	cmp	r0, r2
+	ldreq	r0, _booted_from_nor	/* remember that we've booted from  */
+	moveq	r1, #1			/* NOR                              */
+	streqb	r1, [r0]
+#endif /* !CFG_NO_FLASH */
+
 	mov	r0, #0			/* flush v3/v4 cache */
 	mcr	p15, 0, r0, c7, c7, 0
 	ldr	pc, _done_relocate	/* jump to relocated code */