[U-Boot] [RFC][PATCH 13/19] arm926, tx25: add relocation

Heiko Schocher hs at denx.de
Thu Jul 29 12:45:00 CEST 2010


Signed-off-by: Heiko Schocher <hs at denx.de>
---
 arch/arm/cpu/arm926ejs/start.S      |  165 +++++++++++++++++++++++++----------
 arch/arm/cpu/arm926ejs/u-boot.lds   |   14 +++-
 board/karo/tx25/config.mk           |    4 +-
 board/karo/tx25/tx25.c              |   11 ++-
 include/configs/tx25.h              |   12 ++-
 nand_spl/board/karo/tx25/u-boot.lds |   14 +++-
 6 files changed, 163 insertions(+), 57 deletions(-)

diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
index cf40ce1..cb27cee 100644
--- a/arch/arm/cpu/arm926ejs/start.S
+++ b/arch/arm/cpu/arm926ejs/start.S
@@ -114,13 +114,10 @@ _fiq:
  *************************************************************************
  */

+.globl _TEXT_BASE
 _TEXT_BASE:
 	.word	TEXT_BASE

-.globl _armboot_start
-_armboot_start:
-	.word _start
-
 /*
  * These are defined in the board-specific linker script.
  */
@@ -144,6 +141,34 @@ FIQ_STACK_START:
 	.word 0x0badc0de
 #endif

+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+	.word	0x0badc0de
+
+.globl _datarel_start
+_datarel_start:
+	.word __datarel_start
+
+.globl _datarelrolocal_start
+_datarelrolocal_start:
+	.word __datarelrolocal_start
+
+.globl _datarellocal_start
+_datarellocal_start:
+	.word __datarellocal_start
+
+.globl _datarelro_start
+_datarelro_start:
+	.word __datarelro_start
+
+.globl _got_start
+_got_start:
+	.word __got_start
+
+.globl _got_end
+_got_end:
+	.word __got_end

 /*
  * the actual reset code
@@ -166,62 +191,112 @@ reset:
 	bl	cpu_init_crit
 #endif

-#ifndef CONFIG_SKIP_RELOCATE_UBOOT
-relocate:				/* relocate U-Boot to RAM	    */
-	adr	r0, _start		/* r0 <- current position of code   */
-	ldr	r1, _TEXT_BASE		/* test if we run from flash or RAM */
-	cmp     r0, r1                  /* don't reloc during debug         */
-	beq     stack_setup
-	ldr	r2, _armboot_start
+/* Set stackpointer in internal RAM to call board_init_f */
+call_board_init_f:
+	ldr	sp, =(CONFIG_SYS_INIT_SP_ADDR)
+	ldr	r0,=0x00000000
+	bl	board_init_f
+
+/*------------------------------------------------------------------------------*/
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ */
+	.globl	relocate_code
+relocate_code:
+	mov	r4, r0	/* save addr_sp */
+	mov	r5, r1	/* save addr of gd */
+	mov	r6, r2	/* save addr of destination */
+	mov	r7, r2	/* save addr of destination */
+
+	/* Set up the stack						    */
+stack_setup:
+	mov	sp, r4
+
+	adr	r0, _start
+	ldr	r2, _TEXT_BASE
 	ldr	r3, _bss_start
-	sub	r2, r3, r2		/* r2 <- size of armboot            */
-	add	r2, r0, r2		/* r2 <- source end address         */
+	sub	r2, r3, r2		/* r2 <- size of armboot	    */
+	add	r2, r0, r2		/* r2 <- source end address	    */
+	cmp	r0, r6
+	beq	clear_bss

+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
 copy_loop:
-	ldmia	r0!, {r3-r10}		/* copy from source address [r0]    */
-	stmia	r1!, {r3-r10}		/* copy to   target address [r1]    */
+	ldmia	r0!, {r9-r10}		/* copy from source address [r0]    */
+	stmia	r6!, {r9-r10}		/* copy to   target address [r1]    */
 	cmp	r0, r2			/* until source end addreee [r2]    */
 	ble	copy_loop
-#endif	/* CONFIG_SKIP_RELOCATE_UBOOT */

-	/* Set up the stack						    */
-stack_setup:
-	ldr	r0, _TEXT_BASE		/* upper 128 KiB: relocated uboot   */
-	sub	sp, r0, #128		/* leave 32 words for abort-stack   */
 #ifndef CONFIG_PRELOADER
-	sub	r0, r0, #CONFIG_SYS_MALLOC_LEN	/* malloc area                      */
-	sub	r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo                        */
-#ifdef CONFIG_USE_IRQ
-	sub	r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
+	/* fix got entries */
+	ldr	r1, _TEXT_BASE		/* Text base */
+	mov	r0, r7			/* reloc addr */
+	ldr	r2, _got_start		/* addr in Flash */
+	ldr	r3, _got_end		/* addr in Flash */
+	sub	r3, r3, r1
+	add	r3, r3, r0
+	sub	r2, r2, r1
+	add	r2, r2, r0
+
+fixloop:
+	ldr	r4, [r2]
+	sub	r4, r4, r1
+	add	r4, r4, r0
+	str	r4, [r2]
+	add	r2, r2, #4
+	cmp	r2, r3
+	bne	fixloop
 #endif
-#endif /* CONFIG_PRELOADER */
-	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
-	bic	sp, sp, #7		/* 8-byte alignment for ABI compliance */
+#endif	/* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */

 clear_bss:
-	ldr	r0, _bss_start		/* find start of bss segment        */
-	ldr	r1, _bss_end		/* stop here                        */
-	mov	r2, #0x00000000		/* clear                            */
-
 #ifndef CONFIG_PRELOADER
-clbss_l:str	r2, [r0]		/* clear loop...                    */
+	ldr	r0, _bss_start
+	ldr	r1, _bss_end
+	ldr	r3, _TEXT_BASE		/* Text base */
+	mov	r4, r7			/* reloc addr */
+	sub	r0, r0, r3
+	add	r0, r0, r4
+	sub	r1, r1, r3
+	add	r1, r1, r4
+	mov	r2, #0x00000000		/* clear			    */
+
+clbss_l:str	r2, [r0]		/* clear loop...		    */
 	add	r0, r0, #4
 	cmp	r0, r1
-	ble	clbss_l
+	bne	clbss_l

 	bl coloured_LED_init
 	bl red_LED_on
-#endif /* CONFIG_PRELOADER */
-
-	ldr	pc, _start_armboot
+#endif

-_start_armboot:
+/*
+ * We are done. Do not return, instead branch to second part of board
+ * initialization, now running from RAM.
+ */
 #ifdef CONFIG_NAND_SPL
-	.word nand_boot
-#else
-	.word start_armboot
-#endif /* CONFIG_NAND_SPL */
+	ldr     pc, _nand_boot

+_nand_boot: .word nand_boot
+#else
+	ldr	r0, _TEXT_BASE
+	ldr	r2, _board_init_r
+	sub	r2, r2, r0
+	add	r2, r2, r7	/* position from board_init_r in RAM */
+	/* setup parameters for board_init_r */
+	mov	r0, r5		/* gd_t */
+	mov	r1, r7		/* dest_addr */
+	/* jump to it ... */
+	mov	lr, r2
+	mov	pc, lr
+
+_board_init_r: .word board_init_r
+#endif

 /*
  *************************************************************************
@@ -308,9 +383,7 @@ cpu_init_crit:
 	sub	sp, sp, #S_FRAME_SIZE
 	stmia	sp, {r0 - r12}	@ Save user registers (now in svc mode) r0-r12

-	ldr	r2, _armboot_start
-	sub	r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
-	sub	r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8)  @ set base 2 words into abort stack
+	ldr	r2, IRQ_STACK_START_IN
 	@ get values for "aborted" pc and cpsr (into parm regs)
 	ldmia	r2, {r2 - r3}
 	add	r0, sp, #S_FRAME_SIZE		@ grab pointer to old stack
@@ -342,9 +415,7 @@ cpu_init_crit:
 	.endm

 	.macro get_bad_stack
-	ldr	r13, _armboot_start		@ setup our mode stack
-	sub	r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
-	sub	r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
+	ldr	r13, IRQ_STACK_START_IN		@ setup our mode stack

 	str	lr, [r13]	@ save caller lr in position 0 of saved stack
 	mrs	lr, spsr	@ get the spsr
diff --git a/arch/arm/cpu/arm926ejs/u-boot.lds b/arch/arm/cpu/arm926ejs/u-boot.lds
index ecbc58c..02eb8ca 100644
--- a/arch/arm/cpu/arm926ejs/u-boot.lds
+++ b/arch/arm/cpu/arm926ejs/u-boot.lds
@@ -39,11 +39,23 @@ SECTIONS
 	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }

 	. = ALIGN(4);
-	.data : { *(.data) }
+	.data : {
+		*(.data)
+	__datarel_start = .;
+		*(.data.rel)
+	__datarelrolocal_start = .;
+		*(.data.rel.ro.local)
+	__datarellocal_start = .;
+		*(.data.rel.local)
+	__datarelro_start = .;
+		*(.data.rel.ro)
+	}

+	__got_start = .;
 	. = ALIGN(4);
 	.got : { *(.got) }

+	__got_end = .;
 	. = .;
 	__u_boot_cmd_start = .;
 	.u_boot_cmd : { *(.u_boot_cmd) }
diff --git a/board/karo/tx25/config.mk b/board/karo/tx25/config.mk
index 732a14a..1a32c87 100644
--- a/board/karo/tx25/config.mk
+++ b/board/karo/tx25/config.mk
@@ -1,5 +1,5 @@
 ifdef CONFIG_NAND_SPL
-TEXT_BASE = 0x81ec0000
+TEXT_BASE = 0x810c0000
 else
-TEXT_BASE = 0x81f00000
+TEXT_BASE = 0x81fc1000
 endif
diff --git a/board/karo/tx25/tx25.c b/board/karo/tx25/tx25.c
index 2608698..3940106 100644
--- a/board/karo/tx25/tx25.c
+++ b/board/karo/tx25/tx25.c
@@ -159,7 +159,14 @@ int board_late_init(void)

 int dram_init (void)
 {
+	/* dram_init must store complete ramsize in gd->ram_size */
+	gd->ram_size = get_ram_size((volatile void *)PHYS_SDRAM_1,
+				PHYS_SDRAM_1_SIZE);
+	return 0;
+}

+void dram_init_banksize (void)
+{
 	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 	gd->bd->bi_dram[0].size = get_ram_size((volatile void *)PHYS_SDRAM_1,
 			PHYS_SDRAM_1_SIZE);
@@ -167,9 +174,9 @@ int dram_init (void)
 	gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
 	gd->bd->bi_dram[1].size = get_ram_size((volatile void *)PHYS_SDRAM_2,
 			PHYS_SDRAM_2_SIZE);
-#endif
+#else

-	return 0;
+#endif
 }

 int checkboard(void)
diff --git a/include/configs/tx25.h b/include/configs/tx25.h
index c8188ca..b3c5d6c 100644
--- a/include/configs/tx25.h
+++ b/include/configs/tx25.h
@@ -40,9 +40,9 @@
 /* Start copying real U-boot from the second page */
 #define CONFIG_SYS_NAND_U_BOOT_OFFS	0x800
 #define CONFIG_SYS_NAND_U_BOOT_SIZE	0x30000
-/* Load U-Boot to this address */
-#define CONFIG_SYS_NAND_U_BOOT_DST	0x81f00000
-#define CONFIG_SYS_NAND_U_BOOT_START	CONFIG_SYS_NAND_U_BOOT_DST
+
+#define CONFIG_SYS_NAND_U_BOOT_DST      (0x81fc1000)
+#define CONFIG_SYS_NAND_U_BOOT_START    CONFIG_SYS_NAND_U_BOOT_DST

 #define CONFIG_SYS_NAND_PAGE_SIZE	2048
 #define CONFIG_SYS_NAND_SPARE_SIZE	64
@@ -52,7 +52,6 @@
 #define CONFIG_SYS_NAND_BAD_BLOCK_POS	0
 #else
 #define CONFIG_SKIP_LOWLEVEL_INIT
-#define CONFIG_SKIP_RELOCATE_UBOOT
 #endif

 #define CONFIG_DISPLAY_CPUINFO
@@ -176,4 +175,9 @@
 	"update=nand erase 0 40000;nand write ${loadaddr} 0 40000\0"	\
 	"upd=run load update\0"						\

+/* additions for new relocation code, must added to all boards */
+#define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM_1
+#define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x1000 - /* Fix this */ \
+					CONFIG_SYS_GBL_DATA_SIZE)
+
 #endif /* __CONFIG_H */
diff --git a/nand_spl/board/karo/tx25/u-boot.lds b/nand_spl/board/karo/tx25/u-boot.lds
index 423bed3..c572557 100644
--- a/nand_spl/board/karo/tx25/u-boot.lds
+++ b/nand_spl/board/karo/tx25/u-boot.lds
@@ -41,11 +41,23 @@ SECTIONS
 	.rodata : { *(.rodata) }

 	. = ALIGN(4);
-	.data : { *(.data) }
+	.data : {
+		*(.data)
+	__datarel_start = .;
+		*(.data.rel)
+	__datarelrolocal_start = .;
+		*(.data.rel.ro.local)
+	__datarellocal_start = .;
+		*(.data.rel.local)
+	__datarelro_start = .;
+		*(.data.rel.ro)
+	}

+	__got_start = .;
 	. = ALIGN(4);
 	.got : { *(.got) }

+	__got_end = .;
 	. = .;
 	__u_boot_cmd_start = .;
 	.u_boot_cmd : { *(.u_boot_cmd) }
-- 
1.6.2.5

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany


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