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ARM: implement relocation for ARM926

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Change the implementation for arm926 to relocate the code to
an arbitrary address in RAM.

Adapt the TX25 (i.MX25), magnesium board to test the changes.

On the tx25 board TEXT_BASE is set to the final relocation
address to prevent one more copying of u-boot code
when relocating. More info see:
doc/README.arm-relocation

da850 board:
Tested-by: Ben Gardiner <bengardiner@nanometrics.ca>

Portions of this work were supported by funding from
the CE Linux Forum.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Ben Gardiner <bengardiner@nanometrics.ca>
This commit is contained in:
Heiko Schocher 2010-09-17 13:10:42 +02:00 committed by Wolfgang Denk
parent 561142af20
commit ab86f72c35
14 changed files with 310 additions and 21 deletions
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24
arch/arm/cpu/arm926ejs/orion5x/dram.c
View file

@ -49,7 +49,7 @@ u32 orion5x_sdram_bar(enum memory_bank bank)
result = winregs[bank].base;
return result;
}
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
int dram_init(void)
{
int i;
@ -62,3 +62,25 @@ int dram_init(void)
}
return 0;
}
#else
int dram_init (void)
{
/* dram_init must store complete ramsize in gd->ram_size */
gd->ram_size = get_ram_size(
(volatile long *) orion5x_sdram_bar(0),
CONFIG_MAX_RAM_BANK_SIZE);
return 0;
}
void dram_init_banksize (void)
{
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
gd->bd->bi_dram[i].start = orion5x_sdram_bar(i);
gd->bd->bi_dram[i].size = get_ram_size(
(volatile long *) (gd->bd->bi_dram[i].start),
CONFIG_MAX_RAM_BANK_SIZE);
}
}
#endif

172
arch/arm/cpu/arm926ejs/start.S
View file

@ -114,12 +114,15 @@ _fiq:
*************************************************************************
*/
.globl _TEXT_BASE
_TEXT_BASE:
.word TEXT_BASE
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
.globl _armboot_start
_armboot_start:
.word _start
#endif
/*
* These are defined in the board-specific linker script.
@ -144,7 +147,165 @@ FIQ_STACK_START:
.word 0x0badc0de
#endif
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
/* 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
*/
reset:
/*
* set the cpu to SVC32 mode
*/
mrs r0,cpsr
bic r0,r0,#0x1f
orr r0,r0,#0xd3
msr cpsr,r0
/*
* we do sys-critical inits only at reboot,
* not when booting from ram!
*/
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
bl cpu_init_crit
#endif
/* 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 */
cmp r0, r6
beq clear_bss
#ifndef CONFIG_SKIP_RELOCATE_UBOOT
copy_loop:
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
#ifndef CONFIG_PRELOADER
/* 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 /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
clear_bss:
#ifndef CONFIG_PRELOADER
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
bne clbss_l
bl coloured_LED_init
bl red_LED_on
#endif
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
#ifdef 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
#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/*
* the actual reset code
*/
@ -221,7 +382,7 @@ _start_armboot:
#else
.word start_armboot
#endif /* CONFIG_NAND_SPL */
#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/*
*************************************************************************
@ -307,10 +468,13 @@ cpu_init_crit:
@ carve out a frame on current user stack
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
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
#else
ldr r2, IRQ_STACK_START_IN
#endif
@ 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 +506,13 @@ cpu_init_crit:
.endm
.macro get_bad_stack
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
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
#else
ldr r13, IRQ_STACK_START_IN @ setup our mode stack
#endif
str lr, [r13] @ save caller lr in position 0 of saved stack
mrs lr, spsr @ get the spsr

14
arch/arm/cpu/arm926ejs/u-boot.lds
View file

@ -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) }

4
board/karo/tx25/config.mk
View file

@ -1,5 +1,5 @@
ifdef CONFIG_NAND_SPL
TEXT_BASE = 0x81ec0000
TEXT_BASE = 0x810c0000
else
TEXT_BASE = 0x81f00000
TEXT_BASE = 0x81fc0000
endif

11
board/karo/tx25/tx25.c
View file

@ -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)

24
board/keymile/km_arm/km_arm.c
View file

@ -225,6 +225,7 @@ U_BOOT_CMD(
);
#endif
#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
int dram_init(void)
{
int i;
@ -234,8 +235,31 @@ int dram_init(void)
gd->bd->bi_dram[i].size = get_ram_size((long *)kw_sdram_bar(i),
kw_sdram_bs(i));
}
return 0;
}
#else
int dram_init(void)
{
/* dram_init must store complete ramsize in gd->ram_size */
/* Fix this */
gd->ram_size = get_ram_size((volatile void *)kw_sdram_bar(0),
kw_sdram_bs(0));
return 0;
}
void dram_init_banksize(void)
{
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
gd->bd->bi_dram[i].start = kw_sdram_bar(i);
gd->bd->bi_dram[i].size = kw_sdram_bs(i);
gd->bd->bi_dram[i].size = get_ram_size((long *)kw_sdram_bar(i),
kw_sdram_bs(i));
}
}
#endif
/* Configure and enable MV88E1118 PHY */
void reset_phy(void)

2
board/logicpd/imx27lite/config.mk
View file

@ -1 +1 @@
TEXT_BASE = 0xA7F00000
TEXT_BASE = 0xc0000000

15
board/logicpd/imx27lite/imx27lite.c
View file

@ -66,19 +66,22 @@ int board_init (void)
int dram_init (void)
{
/* dram_init must store complete ramsize in gd->ram_size */
gd->ram_size = get_ram_size((volatile void *)CONFIG_SYS_SDRAM_BASE,
PHYS_SDRAM_1_SIZE);
return 0;
}
#if CONFIG_NR_DRAM_BANKS > 0
gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
gd->bd->bi_dram[0].size = get_ram_size((volatile void *)PHYS_SDRAM_1,
void dram_init_banksize(void)
{
gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
gd->bd->bi_dram[0].size = get_ram_size((volatile void *)CONFIG_SYS_SDRAM_BASE,
PHYS_SDRAM_1_SIZE);
#endif
#if CONFIG_NR_DRAM_BANKS > 1
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
return 0;
}
int checkboard(void)

23
doc/README.arm-relocation
View file

@ -43,6 +43,29 @@ CONFIG_SYS_ARM_WITHOUT_RELOC defined!!!
-------------------------------------------------------------------------------------
For boards which boot from nand_spl, it is possible to save a copy
if TEXT_BASE == relocation address! This prevents that uboot code
is copied again in relocate_code().
example for the tx25 board:
a) cpu starts
b) it copies the first page in nand to internal ram
(nand_spl_code)
c) end executes this code
d) this initialize CPU, RAM, ... and copy itself to RAM
(this bin must fit in one page, so board_init_f()
don;t fit in it ... )
e) there it copy u-boot to CONFIG_SYS_NAND_U_BOOT_DST and
starts this image @ CONFIG_SYS_NAND_U_BOOT_START
f) u-boot code steps through board_init_f() and calculates
the relocation address and copy itself to it
If TEXT_BASE == relocation address, the copying of u-boot
in f) could be saved.
-------------------------------------------------------------------------------------
ToDo:
- fill in bd_t infos (check)

6
include/configs/da850evm.h
View file

@ -39,7 +39,6 @@
#define CONFIG_SYS_HZ_CLOCK clk_get(DAVINCI_AUXCLK_CLKID)
#define CONFIG_SYS_HZ 1000
#define CONFIG_SKIP_LOWLEVEL_INIT
#define CONFIG_SKIP_RELOCATE_UBOOT /* to a proper address, init done */
/*
* Memory Info
@ -137,4 +136,9 @@
#undef CONFIG_CMD_ENV
#endif
/* additions for new relocation code, must added to all boards */
#undef CONFIG_SYS_ARM_WITHOUT_RELOC /* This board is tested with relocation support */
#define CONFIG_SYS_SDRAM_BASE 0xc0000000
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + 0x1000 - /* Fix this */ \
CONFIG_SYS_GBL_DATA_SIZE)
#endif /* __CONFIG_H */

5
include/configs/imx27lite-common.h
View file

@ -235,4 +235,9 @@
"mtdids=" MTDIDS_DEFAULT "\0" \
"mtdparts=" MTDPARTS_DEFAULT "\0" \
/* additions for new relocation code, must added to all boards */
#undef CONFIG_SYS_ARM_WITHOUT_RELOC /* This board is tested with relocation support */
#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 /* __IMX27LITE_COMMON_CONFIG_H */

4
include/configs/km_arm.h
View file

@ -180,4 +180,8 @@ int get_scl (void);
#undef CONFIG_JFFS2_CMDLINE
#endif
/* additions for new relocation code, must added to all boards */
#define CONFIG_SYS_SDRAM_BASE 0x00000000
#define CONFIG_SYS_INIT_SP_ADDR (0x00000000 + 0x1000 - /* Fix this */ \
CONFIG_SYS_GBL_DATA_SIZE)
#endif /* _CONFIG_KM_ARM_H */

13
include/configs/tx25.h
View file

@ -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 (0x81fc0000)
#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
@ -177,4 +176,10 @@
"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 */
#undef CONFIG_SYS_ARM_WITHOUT_RELOC /* This board is tested with relocation support */
#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 */

14
nand_spl/board/karo/tx25/u-boot.lds
View file

@ -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) }