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ARM: implement relocation for ARM11

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Change the implementation for ARM11 to relocate the code to an
arbitrary address in RAM.

Tested on the qong board.

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

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2010-09-17 13:10:40 +02:00 committed by Wolfgang Denk
parent f1d2b313c9
commit e48b7c0aad
5 changed files with 273 additions and 43 deletions
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201
arch/arm/cpu/arm1136/start.S
View File

@ -85,12 +85,15 @@ _end_vect:
*************************************************************************
*/
.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.
@ -103,6 +106,32 @@ _bss_start:
_bss_end:
.word _end
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
.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
#endif
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
.globl IRQ_STACK_START
@ -115,6 +144,164 @@ 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
#endif
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
/*
* 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
#ifdef CONFIG_OMAP2420H4
/* Copy vectors to mask ROM indirect addr */
adr r0, _start /* r0 <- current position of code */
add r0, r0, #4 /* skip reset vector */
mov r2, #64 /* r2 <- size to copy */
add r2, r0, r2 /* r2 <- source end address */
mov r1, #SRAM_OFFSET0 /* build vect addr */
mov r3, #SRAM_OFFSET1
add r1, r1, r3
mov r3, #SRAM_OFFSET2
add r1, r1, r3
next:
ldmia r0!, {r3-r10} /* copy from source address [r0] */
stmia r1!, {r3-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end address [r2] */
bne next /* loop until equal */
bl cpy_clk_code /* put dpll adjust code behind vectors */
#endif
/* the mask ROM code should have PLL and others stable */
#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
#ifdef CONFIG_NAND_SPL
bl nand_boot
#else
#ifdef CONFIG_ONENAND_IPL
bl start_oneboot
#else
bl board_init_f
#endif /* CONFIG_ONENAND_IPL */
#endif /* CONFIG_NAND_SPL */
/*------------------------------------------------------------------------------*/
/*
* 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
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
#endif /* #ifndef CONFIG_PRELOADER */
/*
* 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
jump_2_ram:
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
*/
@ -211,6 +398,8 @@ _start_armboot: .word start_armboot
#endif /* CONFIG_ONENAND_IPL */
#endif /* CONFIG_NAND_SPL */
#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/*
*************************************************************************
*
@ -295,9 +484,13 @@ cpu_init_crit:
sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort stack
#else
ldr r2, _armboot_start
sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
#endif
ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
@ -328,9 +521,13 @@ cpu_init_crit:
.endm
.macro get_bad_stack
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter in banked mode)
#else
ldr r13, _armboot_start @ setup our mode stack (enter in banked mode)
sub r13, r13, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move to reserved a couple spots for abort stack
#endif
str lr, [r13] @ save caller lr in position 0 of saved stack
mrs lr, spsr @ get the spsr
@ -346,9 +543,13 @@ cpu_init_crit:
.macro get_bad_stack_swi
sub r13, r13, #4 @ space on current stack for scratch reg.
str r0, [r13] @ save R0's value.
#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r0, IRQ_STACK_START_IN @ get data regions start
#else
ldr r0, _armboot_start @ get data regions start
sub r0, r0, #(CONFIG_SYS_MALLOC_LEN) @ move past malloc pool
sub r0, r0, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ move past gbl and a couple spots for abort stack
#endif
str lr, [r0] @ save caller lr in position 0 of saved stack
mrs r0, spsr @ get the spsr
str lr, [r0, #4] @ save spsr in position 1 of saved stack

14
arch/arm/cpu/arm1136/u-boot.lds
View File

@ -47,11 +47,23 @@ 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/davedenx/qong/config.mk
View File

@ -1 +1,3 @@
TEXT_BASE = 0x8ff00000
TEXT_BASE = 0xa0000000
# PLATFORM_CPPFLAGS += -DDEBUG

87
board/davedenx/qong/qong.c
View File

@ -33,10 +33,9 @@ DECLARE_GLOBAL_DATA_PTR;
int dram_init (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);
/* 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;
}
@ -49,6 +48,49 @@ static void qong_fpga_reset(void)
udelay(300);
}
int board_early_init_f (void)
{
#ifdef CONFIG_QONG_FPGA
/* CS1: FPGA/Network Controller/GPIO */
/* 16-bit, no DTACK */
__REG(CSCR_U(1)) = 0x00000A01;
__REG(CSCR_L(1)) = 0x20040501;
__REG(CSCR_A(1)) = 0x04020C00;
/* setup pins for FPGA */
mx31_gpio_mux(IOMUX_MODE(0x76, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x7e, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x91, MUX_CTL_OUT_FUNC | MUX_CTL_IN_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x92, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x93, MUX_CTL_GPIO));
/* FPGA reset Pin */
/* rstn = 0 */
mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
mx31_gpio_direction(QONG_FPGA_RST_PIN, MX31_GPIO_DIRECTION_OUT);
/* set interrupt pin as input */
mx31_gpio_direction(QONG_FPGA_IRQ_PIN, MX31_GPIO_DIRECTION_IN);
#endif
/* setup pins for UART1 */
mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
mx31_gpio_mux(MUX_CTS1__UART1_CTS_B);
/* setup pins for SPI (pmic) */
mx31_gpio_mux(MUX_CSPI2_SS0__CSPI2_SS0_B);
mx31_gpio_mux(MUX_CSPI2_MOSI__CSPI2_MOSI);
mx31_gpio_mux(MUX_CSPI2_MISO__CSPI2_MISO);
mx31_gpio_mux(MUX_CSPI2_SCLK__CSPI2_CLK);
mx31_gpio_mux(MUX_CSPI2_SPI_RDY__CSPI2_DATAREADY_B);
return 0;
}
int board_init (void)
{
/* Chip selects */
@ -99,43 +141,6 @@ int board_init (void)
(0 << 0) /* FCE */
);
#ifdef CONFIG_QONG_FPGA
/* CS1: FPGA/Network Controller/GPIO */
/* 16-bit, no DTACK */
__REG(CSCR_U(1)) = 0x00000A01;
__REG(CSCR_L(1)) = 0x20040501;
__REG(CSCR_A(1)) = 0x04020C00;
/* setup pins for FPGA */
mx31_gpio_mux(IOMUX_MODE(0x76, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x7e, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x91, MUX_CTL_OUT_FUNC | MUX_CTL_IN_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x92, MUX_CTL_GPIO));
mx31_gpio_mux(IOMUX_MODE(0x93, MUX_CTL_GPIO));
/* FPGA reset Pin */
/* rstn = 0 */
mx31_gpio_set(QONG_FPGA_RST_PIN, 0);
mx31_gpio_direction(QONG_FPGA_RST_PIN, MX31_GPIO_DIRECTION_OUT);
/* set interrupt pin as input */
mx31_gpio_direction(QONG_FPGA_IRQ_PIN, MX31_GPIO_DIRECTION_IN);
#endif
/* setup pins for UART1 */
mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
mx31_gpio_mux(MUX_CTS1__UART1_CTS_B);
/* setup pins for SPI (pmic) */
mx31_gpio_mux(MUX_CSPI2_SS0__CSPI2_SS0_B);
mx31_gpio_mux(MUX_CSPI2_MOSI__CSPI2_MOSI);
mx31_gpio_mux(MUX_CSPI2_MISO__CSPI2_MISO);
mx31_gpio_mux(MUX_CSPI2_SCLK__CSPI2_CLK);
mx31_gpio_mux(MUX_CSPI2_SPI_RDY__CSPI2_DATAREADY_B);
/* board id for linux */
gd->bd->bi_arch_number = MACH_TYPE_QONG;
gd->bd->bi_boot_params = (0x80000100); /* adress of boot parameters */

10
include/configs/qong.h
View File

@ -282,4 +282,14 @@ extern int qong_nand_rdy(void *chip);
"mtdparts=physmap-flash.0:384k(U-Boot),128k(env1)," \
"128k(env2),2432k(kernel),13m(ramdisk),-(user)"
/* 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 0x80000000
#define CONFIG_SYS_INIT_RAM_ADDR IRAM_BASE_ADDR
#define CONFIG_SYS_INIT_RAM_END IRAM_SIZE
#define CONFIG_SYS_GBL_DATA_OFFSET (CONFIG_SYS_INIT_RAM_END - CONFIG_SYS_GBL_DATA_SIZE)
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)
#define CONFIG_BOARD_EARLY_INIT_F 1
#endif /* __CONFIG_H */