This patch should get rid of spurious poweroff after booting from RAM.
Experimental.

cpu/arm920t/start.S: record in global variable "booted_from_nand" whether we
  booted from NAND or not
board/neo1973/neo1973.c (board_late_init): if booted from RAM, assume that
  wakeup cause was "reset", and skip poweroff check

- Werner Almesberger <werner@openmoko.org>

Index: u-boot/board/neo1973/gta01/gta01.c
===================================================================
--- u-boot.orig/board/neo1973/gta01/gta01.c
+++ u-boot/board/neo1973/gta01/gta01.c
@@ -226,12 +226,16 @@
 
 int board_late_init(void)
 {
+	extern unsigned char booted_from_nand;
 	unsigned char tmp;
 	char buf[32];
 
 	/* Initialize the Power Management Unit with a safe register set */
 	pcf50606_init();
 
+	if (!booted_from_nand)
+		goto woken_by_reset;
+
 	/* obtain wake-up reason, save INT1 in environment */
 	tmp = pcf50606_reg_read(PCF50606_REG_INT1);
 	sprintf(buf, "0x%02x", tmp);
@@ -274,6 +278,7 @@
 		neo1973_poweroff();
 	}
 
+woken_by_reset:
 	/* if there's no other reason, must be regular reset */
 	neo1973_wakeup_cause = NEO1973_WAKEUP_RESET;
 
Index: u-boot/cpu/arm920t/start.S
===================================================================
--- u-boot.orig/cpu/arm920t/start.S
+++ u-boot/cpu/arm920t/start.S
@@ -77,6 +77,14 @@
  *************************************************************************
  */
 
+#ifdef CONFIG_S3C2410_NAND_BOOT
+.globl	booted_from_nand
+booted_from_nand:
+	.word	0
+_booted_from_nand:
+	.word	booted_from_nand
+#endif /* CONFIG_S3C2410_NAND_BOOT */
+
 _TEXT_BASE:
 	.word	TEXT_BASE
 
@@ -281,6 +289,9 @@
 #endif
 1:	b	1b
 done_nand_read:
+	ldr	r0, _booted_from_nand
+	mov	r1, #1
+	strb	r1, [r0]
 #endif /* CONFIG_S3C2410_NAND_BOOT */
 done_relocate:
 #endif /* CONFIG_SKIP_RELOCATE_UBOOT */