upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
439 lines
9.6 KiB
439 lines
9.6 KiB
/*
|
|
* armboot - Startup Code for ARM920 CPU-core
|
|
*
|
|
* Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
|
|
* Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
|
|
* Copyright (c) 2002 Gary Jennejohn <gj@denx.de>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
|
|
#include <config.h>
|
|
#include <version.h>
|
|
#include <status_led.h>
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Jump vector table as in table 3.1 in [1]
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
|
|
.globl _start
|
|
_start: b start_code
|
|
ldr pc, _undefined_instruction
|
|
ldr pc, _software_interrupt
|
|
ldr pc, _prefetch_abort
|
|
ldr pc, _data_abort
|
|
ldr pc, _not_used
|
|
ldr pc, _irq
|
|
ldr pc, _fiq
|
|
|
|
_undefined_instruction: .word undefined_instruction
|
|
_software_interrupt: .word software_interrupt
|
|
_prefetch_abort: .word prefetch_abort
|
|
_data_abort: .word data_abort
|
|
_not_used: .word not_used
|
|
_irq: .word irq
|
|
_fiq: .word fiq
|
|
|
|
.balignl 16,0xdeadbeef
|
|
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Startup Code (called from the ARM reset exception vector)
|
|
*
|
|
* do important init only if we don't start from memory!
|
|
* relocate armboot to ram
|
|
* setup stack
|
|
* jump to second stage
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
_TEXT_BASE:
|
|
.word TEXT_BASE
|
|
|
|
.globl _armboot_start
|
|
_armboot_start:
|
|
.word _start
|
|
|
|
/*
|
|
* These are defined in the board-specific linker script.
|
|
*/
|
|
.globl _bss_start
|
|
_bss_start:
|
|
.word __bss_start
|
|
|
|
.globl _bss_end
|
|
_bss_end:
|
|
.word _end
|
|
|
|
#ifdef CONFIG_USE_IRQ
|
|
/* IRQ stack memory (calculated at run-time) */
|
|
.globl IRQ_STACK_START
|
|
IRQ_STACK_START:
|
|
.word 0x0badc0de
|
|
|
|
/* IRQ stack memory (calculated at run-time) */
|
|
.globl FIQ_STACK_START
|
|
FIQ_STACK_START:
|
|
.word 0x0badc0de
|
|
#endif
|
|
|
|
|
|
/*
|
|
* the actual start code
|
|
*/
|
|
|
|
start_code:
|
|
/*
|
|
* set the cpu to SVC32 mode
|
|
*/
|
|
mrs r0,cpsr
|
|
bic r0,r0,#0x1f
|
|
orr r0,r0,#0xd3
|
|
msr cpsr,r0
|
|
|
|
bl coloured_LED_init
|
|
bl red_LED_on
|
|
|
|
#if defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK) || defined(CONFIG_AT91RM9200DF)
|
|
/*
|
|
* relocate exception table
|
|
*/
|
|
ldr r0, =_start
|
|
ldr r1, =0x0
|
|
mov r2, #16
|
|
copyex:
|
|
subs r2, r2, #1
|
|
ldr r3, [r0], #4
|
|
str r3, [r1], #4
|
|
bne copyex
|
|
#endif
|
|
|
|
#if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410)
|
|
/* turn off the watchdog */
|
|
|
|
# if defined(CONFIG_S3C2400)
|
|
# define pWTCON 0x15300000
|
|
# define INTMSK 0x14400008 /* Interupt-Controller base addresses */
|
|
# define CLKDIVN 0x14800014 /* clock divisor register */
|
|
#else
|
|
# define pWTCON 0x53000000
|
|
# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
|
|
# define INTSUBMSK 0x4A00001C
|
|
# define CLKDIVN 0x4C000014 /* clock divisor register */
|
|
# endif
|
|
|
|
ldr r0, =pWTCON
|
|
mov r1, #0x0
|
|
str r1, [r0]
|
|
|
|
/*
|
|
* mask all IRQs by setting all bits in the INTMR - default
|
|
*/
|
|
mov r1, #0xffffffff
|
|
ldr r0, =INTMSK
|
|
str r1, [r0]
|
|
# if defined(CONFIG_S3C2410)
|
|
ldr r1, =0x3ff
|
|
ldr r0, =INTSUBMSK
|
|
str r1, [r0]
|
|
# endif
|
|
|
|
/* FCLK:HCLK:PCLK = 1:2:4 */
|
|
/* default FCLK is 120 MHz ! */
|
|
ldr r0, =CLKDIVN
|
|
mov r1, #3
|
|
str r1, [r0]
|
|
#endif /* CONFIG_S3C2400 || CONFIG_S3C2410 */
|
|
|
|
/*
|
|
* we do sys-critical inits only at reboot,
|
|
* not when booting from ram!
|
|
*/
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
bl cpu_init_crit
|
|
#endif
|
|
|
|
#ifndef CONFIG_AT91RM9200
|
|
|
|
#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
|
|
ldr r3, _bss_start
|
|
sub r2, r3, r2 /* r2 <- size of armboot */
|
|
add r2, r0, r2 /* r2 <- source end address */
|
|
|
|
copy_loop:
|
|
ldmia r0!, {r3-r10} /* copy from source address [r0] */
|
|
stmia r1!, {r3-r10} /* copy to target address [r1] */
|
|
cmp r0, r2 /* until source end addreee [r2] */
|
|
ble copy_loop
|
|
#endif /* CONFIG_SKIP_RELOCATE_UBOOT */
|
|
#endif
|
|
/* Set up the stack */
|
|
stack_setup:
|
|
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
|
|
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)
|
|
#endif
|
|
sub sp, r0, #12 /* leave 3 words for abort-stack */
|
|
|
|
clear_bss:
|
|
ldr r0, _bss_start /* find start of bss segment */
|
|
ldr r1, _bss_end /* stop here */
|
|
mov r2, #0x00000000 /* clear */
|
|
|
|
clbss_l:str r2, [r0] /* clear loop... */
|
|
add r0, r0, #4
|
|
cmp r0, r1
|
|
ble clbss_l
|
|
|
|
ldr pc, _start_armboot
|
|
|
|
_start_armboot: .word start_armboot
|
|
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* CPU_init_critical registers
|
|
*
|
|
* setup important registers
|
|
* setup memory timing
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
|
|
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
|
|
cpu_init_crit:
|
|
/*
|
|
* flush v4 I/D caches
|
|
*/
|
|
mov r0, #0
|
|
mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
|
|
mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
|
|
|
|
/*
|
|
* disable MMU stuff and caches
|
|
*/
|
|
mrc p15, 0, r0, c1, c0, 0
|
|
bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
|
|
bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
|
|
orr r0, r0, #0x00000002 @ set bit 2 (A) Align
|
|
orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
|
|
mcr p15, 0, r0, c1, c0, 0
|
|
|
|
/*
|
|
* before relocating, we have to setup RAM timing
|
|
* because memory timing is board-dependend, you will
|
|
* find a lowlevel_init.S in your board directory.
|
|
*/
|
|
mov ip, lr
|
|
#if defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK) || defined(CONFIG_AT91RM9200DF)
|
|
|
|
#else
|
|
bl lowlevel_init
|
|
#endif
|
|
mov lr, ip
|
|
mov pc, lr
|
|
#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
|
|
|
|
/*
|
|
*************************************************************************
|
|
*
|
|
* Interrupt handling
|
|
*
|
|
*************************************************************************
|
|
*/
|
|
|
|
@
|
|
@ IRQ stack frame.
|
|
@
|
|
#define S_FRAME_SIZE 72
|
|
|
|
#define S_OLD_R0 68
|
|
#define S_PSR 64
|
|
#define S_PC 60
|
|
#define S_LR 56
|
|
#define S_SP 52
|
|
|
|
#define S_IP 48
|
|
#define S_FP 44
|
|
#define S_R10 40
|
|
#define S_R9 36
|
|
#define S_R8 32
|
|
#define S_R7 28
|
|
#define S_R6 24
|
|
#define S_R5 20
|
|
#define S_R4 16
|
|
#define S_R3 12
|
|
#define S_R2 8
|
|
#define S_R1 4
|
|
#define S_R0 0
|
|
|
|
#define MODE_SVC 0x13
|
|
#define I_BIT 0x80
|
|
|
|
/*
|
|
* use bad_save_user_regs for abort/prefetch/undef/swi ...
|
|
* use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
|
|
*/
|
|
|
|
.macro bad_save_user_regs
|
|
sub sp, sp, #S_FRAME_SIZE
|
|
stmia sp, {r0 - r12} @ Calling r0-r12
|
|
ldr r2, _armboot_start
|
|
sub r2, r2, #(CONFIG_STACKSIZE)
|
|
sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
|
|
sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
|
|
ldmia r2, {r2 - r3} @ get pc, cpsr
|
|
add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
|
|
|
|
add r5, sp, #S_SP
|
|
mov r1, lr
|
|
stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
|
|
mov r0, sp
|
|
.endm
|
|
|
|
.macro irq_save_user_regs
|
|
sub sp, sp, #S_FRAME_SIZE
|
|
stmia sp, {r0 - r12} @ Calling r0-r12
|
|
add r7, sp, #S_PC
|
|
stmdb r7, {sp, lr}^ @ Calling SP, LR
|
|
str lr, [r7, #0] @ Save calling PC
|
|
mrs r6, spsr
|
|
str r6, [r7, #4] @ Save CPSR
|
|
str r0, [r7, #8] @ Save OLD_R0
|
|
mov r0, sp
|
|
.endm
|
|
|
|
.macro irq_restore_user_regs
|
|
ldmia sp, {r0 - lr}^ @ Calling r0 - lr
|
|
mov r0, r0
|
|
ldr lr, [sp, #S_PC] @ Get PC
|
|
add sp, sp, #S_FRAME_SIZE
|
|
subs pc, lr, #4 @ return & move spsr_svc into cpsr
|
|
.endm
|
|
|
|
.macro get_bad_stack
|
|
ldr r13, _armboot_start @ setup our mode stack
|
|
sub r13, r13, #(CONFIG_STACKSIZE)
|
|
sub r13, r13, #(CONFIG_SYS_MALLOC_LEN)
|
|
sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
|
|
|
|
str lr, [r13] @ save caller lr / spsr
|
|
mrs lr, spsr
|
|
str lr, [r13, #4]
|
|
|
|
mov r13, #MODE_SVC @ prepare SVC-Mode
|
|
@ msr spsr_c, r13
|
|
msr spsr, r13
|
|
mov lr, pc
|
|
movs pc, lr
|
|
.endm
|
|
|
|
.macro get_irq_stack @ setup IRQ stack
|
|
ldr sp, IRQ_STACK_START
|
|
.endm
|
|
|
|
.macro get_fiq_stack @ setup FIQ stack
|
|
ldr sp, FIQ_STACK_START
|
|
.endm
|
|
|
|
/*
|
|
* exception handlers
|
|
*/
|
|
.align 5
|
|
undefined_instruction:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_undefined_instruction
|
|
|
|
.align 5
|
|
software_interrupt:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_software_interrupt
|
|
|
|
.align 5
|
|
prefetch_abort:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_prefetch_abort
|
|
|
|
.align 5
|
|
data_abort:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_data_abort
|
|
|
|
.align 5
|
|
not_used:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_not_used
|
|
|
|
#ifdef CONFIG_USE_IRQ
|
|
|
|
.align 5
|
|
irq:
|
|
get_irq_stack
|
|
irq_save_user_regs
|
|
bl do_irq
|
|
irq_restore_user_regs
|
|
|
|
.align 5
|
|
fiq:
|
|
get_fiq_stack
|
|
/* someone ought to write a more effiction fiq_save_user_regs */
|
|
irq_save_user_regs
|
|
bl do_fiq
|
|
irq_restore_user_regs
|
|
|
|
#else
|
|
|
|
.align 5
|
|
irq:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_irq
|
|
|
|
.align 5
|
|
fiq:
|
|
get_bad_stack
|
|
bad_save_user_regs
|
|
bl do_fiq
|
|
|
|
#endif
|
|
|