edminiv2: switch to SPL

ED Mini V2 is based on Orion 5x which boots at fixed
address 0xFFFF0000 in NOR Flash. Place SPL there, and
switch U-Boot from .bin to .img format, stored in
NOR Flash at 0xFFF90000.

Note: this patch was tested on HW and works, i.e.
it boots U-Boot properly, but SPL console output
currently does not appear, due to GD being trashed
by arch/arm/lib/spl.c. This trashing is soon to be
removed, and then ED Mini V2 SPL console output will
become visible.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>

arch/arm/cpu/arm926ejs/orion5x/u-boot-spl.lds

+/*
+ * (C) Copyright 2014 Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * Based on:
+ *
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ * Tom Cubie <tangliang@allwinnertech.com>
+ *
+ * Based on omap-common/u-boot-spl.lds:
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * (C) Copyright 2010
+ * Texas Instruments, <www.ti.com>
+ *	Aneesh V <aneesh@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+MEMORY { .nor : ORIGIN = CONFIG_SPL_TEXT_BASE,\
+		LENGTH = CONFIG_SPL_MAX_SIZE }
+MEMORY { .bss : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \
+		LENGTH = CONFIG_SPL_BSS_MAX_SIZE }
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+	.text      :
+	{
+		__start = .;
+		*(.vectors)
+		CPUDIR/start.o	(.text)
+		*(.text*)
+	} > .nor
+
+	. = ALIGN(4);
+	.rodata : { *(SORT_BY_ALIGNMENT(.rodata*)) } >.nor
+
+	. = ALIGN(4);
+	.data : { *(SORT_BY_ALIGNMENT(.data*)) } >.nor
+
+	. = ALIGN(4);
+	.u_boot_list : {
+		KEEP(*(SORT(.u_boot_list*)));
+	} > .nor
+
+	. = ALIGN(4);
+	__image_copy_end = .;
+	_end = .;
+
+	.bss :
+	{
+		. = ALIGN(4);
+		__bss_start = .;
+		*(.bss*)
+		. = ALIGN(4);
+		__bss_end = .;
+	} > .bss
+}

arch/arm/include/asm/arch-orion5x/spl.h

+/*
+ * (C) Copyright 2014 Albert ARIBAUD <albert.u.boot@aribaud.net>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef	_ASM_ARCH_SPL_H_
+#define	_ASM_ARCH_SPL_H_
+
+#define BOOT_DEVICE_NOR		1

arch/arm/mach-orion5x/Kconfig

@@ -5,6 +5,7 @@ choice
 
 config TARGET_EDMINIV2
 	bool "LaCie Ethernet Disk mini V2"
+	select SUPPORT_SPL
 
 endchoice
 

arch/arm/mach-orion5x/cpu.c

@@ -234,7 +234,9 @@ int arch_cpu_init(void)
 	/* Enable and invalidate L2 cache in write through mode */
 	invalidate_l2_cache();
 
+#ifdef CONFIG_SPL_BUILD
 	orion5x_config_adr_windows();
+#endif
 
 	return 0;
 }

arch/arm/mach-orion5x/lowlevel_init.S

@@ -62,14 +62,16 @@
 /*
  * Low-level init happens right after start.S has switched to SVC32,
  * flushed and disabled caches and disabled MMU. We're still running
- * from the boot chip select, so the first thing we should do is set
- * up RAM for us to relocate into.
+ * from the boot chip select, so the first thing SPL should do is to
+ * set up the RAM to copy U-Boot into.
  */
 
 .globl lowlevel_init
 
 lowlevel_init:
 
+#ifdef CONFIG_SPL_BUILD
+
 	/* Use 'r4 as the base for internal register accesses */
 	ldr	r4, =ORION5X_REGS_PHY_BASE
 
@@ -273,5 +275,13 @@ lowlevel_init:
 	orr	r2, r2, r6
 	str	r2, [r3, #0x484]
 
+	/* enable for 2 GB DDR; detection should find out real amount */
+	sub	r6, r6, r6
+	str	r6, [r3, #0x500]
+	ldr	r6, =0x7fff0001
+	str	r6, [r3, #0x504]
+
+#endif /* CONFIG_SPL_BUILD */
+
 	/* Return to U-boot via saved link register */
 	mov	pc, lr

board/LaCie/edminiv2/edminiv2.c

@@ -12,6 +12,8 @@
 #include <miiphy.h>
 #include <asm/arch/orion5x.h>
 #include "../common/common.h"
+#include <spl.h>
+#include <ns16550.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -83,3 +85,21 @@ void reset_phy(void)
 	mv_phy_88e1116_init("egiga0", 8);
 }
 #endif /* CONFIG_RESET_PHY_R */
+
+/*
+ * SPL serial setup and NOR boot device selection
+ */
+
+#ifdef CONFIG_SPL_BUILD
+
+void spl_board_init(void)
+{
+	preloader_console_init();
+}
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_NOR;
+}
+
+#endif /* CONFIG_SPL_BUILD */

configs/edminiv2_defconfig

-CONFIG_ARM=y
-CONFIG_ORION5X=y
-CONFIG_TARGET_EDMINIV2=y
+CONFIG_SPL=y
++S:CONFIG_ARM=y
++S:CONFIG_ORION5X=y
++S:CONFIG_TARGET_EDMINIV2=y

include/configs/edminiv2.h

@@ -13,9 +13,30 @@
 #define _CONFIG_EDMINIV2_H
 
 /* general settings */
-#define CONFIG_SYS_TEXT_BASE 0xfff90000
 #define CONFIG_SYS_GENERIC_BOARD
 
+/*
+ * SPL
+ */
+
+#define CONFIG_SPL_FRAMEWORK
+#define CONFIG_SPL_LIBGENERIC_SUPPORT
+#define CONFIG_SPL_LIBCOMMON_SUPPORT
+#define CONFIG_SPL_SERIAL_SUPPORT
+#define CONFIG_SPL_NOR_SUPPORT
+#define CONFIG_SPL_TEXT_BASE		0xffff0000
+#define CONFIG_SPL_MAX_SIZE		0x0000fff0
+#define CONFIG_SPL_STACK		0x00020000
+#define CONFIG_SPL_BSS_START_ADDR	0x00020000
+#define CONFIG_SPL_BSS_MAX_SIZE		0x0001ffff
+#define CONFIG_SYS_SPL_MALLOC_START	0x00040000
+#define CONFIG_SYS_SPL_MALLOC_SIZE	0x0001ffff
+#define CONFIG_SPL_LDSCRIPT            "$(CPUDIR)/orion5x/u-boot-spl.lds"
+#define CONFIG_SPL_BOARD_INIT
+#define CONFIG_SYS_UBOOT_BASE		0xfff90000
+#define CONFIG_SYS_UBOOT_START		0x00800000
+#define CONFIG_SYS_TEXT_BASE 		0x00800000
+
 /*
  * Version number information
  */