powerpc/mpc83xx: add support for new SPL

This adds arch support for PPC mpc83xx to boot "minimal" (4K) SPLs
using the new infrastructure.

Existing nand_spl targets are updated to deal with the name change
from nand_init.c to spl_minimal.c (as in theory this isn't limited
to NAND anymore).

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

README

@@ -2779,6 +2779,12 @@ FIT uImage format:
 		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
 		Filename to read to load U-Boot when reading from FAT
 
+		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
+		Set this for NAND SPL on PPC mpc83xx targets, so that
+		start.S waits for the rest of the SPL to load before
+		continuing (the hardware starts execution after just
+		loading the first page rather than the full 4K).
+
 		CONFIG_SPL_NAND_BASE
 		Include nand_base.c in the SPL.  Requires
 		CONFIG_SPL_NAND_DRIVERS.

arch/powerpc/cpu/mpc83xx/Makefile

@@ -27,8 +27,22 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(CPU).o
 
+MINIMAL=
+
+ifdef CONFIG_SPL_BUILD
+ifdef CONFIG_SPL_INIT_MINIMAL
+MINIMAL=y
+endif
+endif
+
 START	= start.o
 
+ifdef MINIMAL
+
+COBJS-y	+= spl_minimal.o
+
+else
+
 COBJS-y += traps.o
 COBJS-y += cpu.o
 COBJS-y += cpu_init.o
@@ -51,6 +65,8 @@ COBJS-y += spd_sdram.o
 endif
 COBJS-$(CONFIG_FSL_DDR2) += law.o
 
+endif # not minimal
+
 COBJS	:= $(COBJS-y)
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c) $(addprefix $(obj),$(COBJS_LN-y:.o=.c))
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS) $(COBJS_LN-y))

arch/powerpc/cpu/mpc83xx/start.S

@@ -58,7 +58,13 @@
 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
 #endif
 
-#if !defined(CONFIG_NAND_SPL) && !defined(CONFIG_SYS_RAMBOOT)
+#if defined(CONFIG_NAND_SPL) || \
+	(defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_INIT_MINIMAL))
+#define MINIMAL_SPL
+#endif
+
+#if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_NAND_SPL) && \
+	!defined(CONFIG_SYS_RAMBOOT)
 #define CONFIG_SYS_FLASHBOOT
 #endif
 
@@ -72,7 +78,7 @@
 	GOT_ENTRY(__bss_start)
 	GOT_ENTRY(__bss_end__)
 
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 	GOT_ENTRY(_FIXUP_TABLE_)
 	GOT_ENTRY(_start)
 	GOT_ENTRY(_start_of_vectors)
@@ -206,7 +212,8 @@ _start: /* time t 0 */
 	/* Initialise the E300 processor core		*/
 	/*------------------------------------------*/
 
-#ifdef CONFIG_NAND_SPL
+#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_MPC83XX_WAIT_FOR_NAND)) || \
+		defined(CONFIG_NAND_SPL)
 	/* The FCM begins execution after only the first page
 	 * is loaded.  Wait for the rest before branching
 	 * to another flash page.
@@ -292,7 +299,7 @@ in_flash:
 
 	/* NOTREACHED - board_init_f() does not return */
 
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 /*
  * Vector Table
  */
@@ -467,7 +474,7 @@ int_return:
 	lwz	r1,GPR1(r1)
 	SYNC
 	rfi
-#endif /* !CONFIG_NAND_SPL */
+#endif /* !MINIMAL_SPL */
 
 /*
  * This code initialises the E300 processor core
@@ -724,7 +731,7 @@ setup_bats:
  * Note: requires that all cache bits in
  * HID0 are in the low half word.
  */
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 	.globl	icache_enable
 icache_enable:
 	mfspr	r3, HID0
@@ -753,7 +760,7 @@ icache_status:
 	mfspr	r3, HID0
 	rlwinm	r3, r3, (31 - HID0_ICE_SHIFT + 1), 31, 31
 	blr
-#endif	/* !CONFIG_NAND_SPL */
+#endif	/* !MINIMAL_SPL */
 
 	.globl	dcache_enable
 dcache_enable:
@@ -936,7 +943,7 @@ in_ram:
 	stw	r0,0(r3)
 2:	bdnz	1b
 
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 	/*
 	 * Now adjust the fixups and the pointers to the fixups
 	 * in case we need to move ourselves again.
@@ -991,7 +998,7 @@ clear_bss:
 	mr	r4, r10		/* Destination Address		*/
 	bl	board_init_r
 
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 	/*
 	 * Copy exception vector code to low memory
 	 *
@@ -1061,7 +1068,7 @@ trap_init:
 	mtlr	r4			/* restore link register    */
 	blr
 
-#endif /* !CONFIG_NAND_SPL */
+#endif /* !MINIMAL_SPL */
 
 #ifdef CONFIG_SYS_INIT_RAM_LOCK
 lock_ram_in_cache:
@@ -1085,7 +1092,7 @@ lock_ram_in_cache:
 	sync
 	blr
 
-#ifndef CONFIG_NAND_SPL
+#ifndef MINIMAL_SPL
 .globl unlock_ram_in_cache
 unlock_ram_in_cache:
 	/* invalidate the INIT_RAM section */
@@ -1111,7 +1118,7 @@ unlock_ram_in_cache:
 	sync
 	mtspr	HID0, r3		/* no invalidate, unlock */
 	blr
-#endif /* !CONFIG_NAND_SPL */
+#endif /* !MINIMAL_SPL */
 #endif /* CONFIG_SYS_INIT_RAM_LOCK */
 
 #ifdef CONFIG_SYS_FLASHBOOT

arch/powerpc/cpu/mpc83xx/u-boot-spl.lds

@@ -0,0 +1,55 @@
+/*
+ * (C) Copyright 2006
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+OUTPUT_ARCH(powerpc)
+SECTIONS
+{
+	. = 0xfff00000;
+	.text : {
+		*(.text*)
+		. = ALIGN(16);
+		*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
+	}
+
+	. = ALIGN(8);
+	.data : {
+		*(.data*)
+		*(.sdata*)
+		_GOT2_TABLE_ = .;
+		KEEP(*(.got2))
+		KEEP(*(.got))
+		PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
+	}
+	__got2_entries = ((_GLOBAL_OFFSET_TABLE_ - _GOT2_TABLE_) >> 2) - 1;
+
+	. = ALIGN(8);
+	__bss_start = .;
+	.bss (NOLOAD) : {
+		*(.*bss)
+	}
+	__bss_end__ = .;
+}
+ENTRY(_start)
+ASSERT(__bss_end__ <= 0xfff01000, "NAND bootstrap too big");

arch/powerpc/lib/Makefile

@@ -47,7 +47,8 @@ endif
 endif
 
 ifdef MINIMAL
-COBJS-y += cache.o
+COBJS-y += cache.o time.o
+SOBJS-y += ticks.o
 else
 
 SOBJS-y	+= ppcstring.o

nand_spl/board/freescale/mpc8313erdb/Makefile

@@ -36,7 +36,7 @@ AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
 
 SOBJS	= start.o ticks.o
-COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o nand_init.o \
+COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
 	  time.o cache.o
 
 SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
@@ -80,8 +80,8 @@ $(obj)$(BOARD).c:
 $(obj)ns16550.c:
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $(obj)ns16550.c
 
-$(obj)nand_init.c:
-	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/nand_init.c $(obj)nand_init.c
+$(obj)spl_minimal.c:
+	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $(obj)spl_minimal.c
 
 $(obj)cache.c:
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $(obj)cache.c

nand_spl/board/freescale/mpc8315erdb/Makefile

@@ -36,7 +36,7 @@ AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
 
 SOBJS	= start.o ticks.o
-COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o nand_init.o \
+COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
 	  time.o cache.o
 
 SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
@@ -80,8 +80,8 @@ $(obj)$(BOARD).c:
 $(obj)ns16550.c:
 	ln -sf $(SRCTREE)/drivers/serial/ns16550.c $(obj)ns16550.c
 
-$(obj)nand_init.c:
-	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/nand_init.c $(obj)nand_init.c
+$(obj)spl_minimal.c:
+	ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $(obj)spl_minimal.c
 
 $(obj)cache.c:
 	ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $(obj)cache.c

nand_spl/board/sheldon/simpc8313/Makefile

@@ -36,7 +36,7 @@ AFLAGS	+= -DCONFIG_NAND_SPL
 CFLAGS	+= -DCONFIG_NAND_SPL
 
 SOBJS	= start.o ticks.o
-COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o nand_init.o \
+COBJS	= nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
 	  time.o cache.o
 
 SRCS	:= $(addprefix $(obj),$(SOBJS:.o=.S) $(COBJS:.o=.c))
@@ -84,9 +84,9 @@ $(obj)ns16550.c:
 	@rm -f $@
 	ln -s $(SRCTREE)/drivers/serial/ns16550.c $@
 
-$(obj)nand_init.c:
+$(obj)spl_minimal.c:
 	@rm -f $@
-	ln -s $(SRCTREE)/arch/powerpc/cpu/mpc83xx/nand_init.c $@
+	ln -s $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $@
 
 $(obj)cache.c:
 	@rm -f $@