Patch by Jerry Van Baren, 08 Nov 2004:

- Add low-boot option for MPC8260ADS board (if lowboot is selected,
  the jumper for the HRCW source should select flash. If lowboot is
  not selected, the jumper for the HRCW source should select the
  BCSR.
- change default load base address to 0x00400000

CHANGELOG

@@ -2,6 +2,13 @@
 Changes for U-Boot 1.1.3:
 ======================================================================
 
+* Patch by Jerry Van Baren, 08 Nov 2004:
+  - Add low-boot option for MPC8260ADS board (if lowboot is selected,
+    the jumper for the HRCW source should select flash. If lowboot is
+    not selected, the jumper for the HRCW source should select the
+    BCSR.
+  - change default load base address to 0x00400000
+
 * Patch by Yuli Barcohen, 08 Nov 2004:
   Add support for Analogue & Micro Rattler boards.
   Tested on Rattler8248.

Makefile

@@ -992,13 +992,21 @@ ISPAN_REVB_config:	unconfig
 	@./mkconfig -a ISPAN ppc mpc8260 ispan
 
 MPC8260ADS_config	\
+MPC8260ADS_lowboot_config	\
 MPC8260ADS_33MHz_config	\
+MPC8260ADS_33MHz_lowboot_config	\
 MPC8260ADS_40MHz_config	\
+MPC8260ADS_40MHz_lowboot_config	\
 MPC8272ADS_config	\
+MPC8272ADS_lowboot_config	\
 PQ2FADS_config		\
+PQ2FADS_lowboot_config		\
 PQ2FADS-VR_config	\
+PQ2FADS-VR_lowboot_config	\
 PQ2FADS-ZU_config	\
+PQ2FADS-ZU_lowboot_config	\
 PQ2FADS-ZU_66MHz_config	\
+PQ2FADS-ZU_66MHz_lowboot_config	\
 	:		unconfig
 	$(if $(findstring PQ2FADS,$@), \
 	@echo "#define CONFIG_ADSTYPE CFG_PQ2FADS" > include/config.h, \
@@ -1007,6 +1015,10 @@ PQ2FADS-ZU_66MHz_config	\
 	@echo "#define CONFIG_8260_CLKIN" $(subst MHz,,$(word 2,$(subst _, ,$@)))"000000" >> include/config.h, \
 	$(if $(findstring VR,$@), \
 	@echo "#define CONFIG_8260_CLKIN 66000000" >> include/config.h))
+	@[ -z "$(findstring lowboot_,$@)" ] || \
+		{ echo "TEXT_BASE = 0xFF800000" >board/mpc8260ads/config.tmp ; \
+		  echo "... with lowboot configuration" ; \
+		}
 	@./mkconfig -a MPC8260ADS ppc mpc8260 mpc8260ads
 
 MPC8266ADS_config:	unconfig

board/mpc8260ads/config.mk

@@ -29,4 +29,9 @@
 # MPC8260ADS, MPC8266ADS, and PQ2FADS-ZU/VR boards
 #
 
-TEXT_BASE = 0xfff00000
+sinclude $(TOPDIR)/board/$(BOARDDIR)/config.tmp
+
+ifndef TEXT_BASE
+## Standard: boot high
+TEXT_BASE = 0xFFF00000
+endif

cpu/mpc8260/start.S

@@ -172,7 +172,7 @@ _start_warm:
 	b	boot_warm
 
 boot_cold:
-#if defined(CONFIG_MPC8260ADS)
+#if defined(CONFIG_MPC8260ADS) && defined(CFG_DEFAULT_IMMR)
 	lis	r3, CFG_DEFAULT_IMMR@h
 	nop
 	lwz	r4, 0(r3)
@@ -183,7 +183,7 @@ boot_cold:
 	nop
 	stw	r4, 0(r3)
 	nop
-#endif /* CONFIG_MPC8260ADS */
+#endif /* CONFIG_MPC8260ADS && CFG_DEFAULT_IMMR */
 boot_warm:
 	mfmsr	r5			/* save msr contents		*/
 

include/configs/MPC8260ADS.h

@@ -42,6 +42,14 @@
 
 #define CONFIG_MPC8260ADS	1	/* Motorola PQ2 ADS family board */
 
+/*
+ * Figure out if we are booting low via flash HRCW or high via the BCSR.
+ */
+#if (TEXT_BASE != 0xFFF00000)		/* Boot low (flash HRCW) */
+#   define CFG_LOWBOOT          1
+#endif
+
+
 /* ADS flavours */
 #define CFG_8260ADS		1	/* MPC8260ADS */
 #define CFG_8266ADS		2	/* MPC8266ADS */
@@ -252,7 +260,7 @@
 #define CFG_MEMTEST_START	0x00100000	/* memtest works on */
 #define CFG_MEMTEST_END		0x00f00000	/* 1 ... 15 MB in DRAM	*/
 
-#define CFG_LOAD_ADDR		0x100000	/* default load address */
+#define CFG_LOAD_ADDR		0x400000	/* default load address */
 
 #define CFG_HZ			1000	/* decrementer freq: 1 ms ticks */
 
@@ -274,7 +282,9 @@
 #define CFG_JFFS_CUSTOM_PART
 
 /* this is stuff came out of the Motorola docs */
+#ifndef CFG_LOWBOOT
 #define CFG_DEFAULT_IMMR	0x0F010000
+#endif
 
 #define CFG_IMMR		0xF0000000
 #define CFG_BCSR		0xF4500000
@@ -296,12 +306,21 @@
 #define CFG_INIT_SP_OFFSET	CFG_GBL_DATA_OFFSET
 
 
-/* 0x0EA28205 */
+#ifdef CFG_LOWBOOT
+/* PQ2FADS flash HRCW = 0x0EB4B645 */
+#define CFG_HRCW_MASTER (   ( HRCW_BPS11 | HRCW_CIP )			    |\
+			    ( HRCW_L2CPC10 | HRCW_DPPC11 | HRCW_ISB100 )    |\
+			    ( HRCW_BMS | HRCW_MMR11 | HRCW_LBPC01 | HRCW_APPC10 ) |\
+			    ( HRCW_CS10PC01 | HRCW_MODCK_H0101 )	     \
+			)
+#else
+/* PQ2FADS BCSR HRCW = 0x0CB23645 */
 #define CFG_HRCW_MASTER (   ( HRCW_BPS11 | HRCW_CIP )			    |\
 			    ( HRCW_L2CPC10 | HRCW_DPPC10 | HRCW_ISB010 )    |\
 			    ( HRCW_BMS | HRCW_APPC10 )			    |\
 			    ( HRCW_MODCK_H0101 )			     \
 			)
+#endif
 /* no slaves */
 #define CFG_HRCW_SLAVE1 0
 #define CFG_HRCW_SLAVE2 0