*/
-
#include <config.h>
#include <version.h>
*************************************************************************
*/
-/*
- * CFG_MEM_END is in the board dependent config-file (configs/config_BOARD.h)
- */
_TEXT_BASE:
.word TEXT_BASE
.word _start
/*
- * Note: _armboot_end_data and _armboot_end are defined
- * by the (board-dependent) linker script.
- * _armboot_end_data is the first usable FLASH address after armboot
+ * These are defined in the board-specific linker script.
*/
-.globl _armboot_end_data
-_armboot_end_data:
- .word armboot_end_data
-.globl _armboot_end
-_armboot_end:
- .word armboot_end
+.globl _bss_start
+_bss_start:
+ .word __bss_start
-/*
- * _armboot_real_end is the first usable RAM address behind armboot
- * and the various stacks
- */
-.globl _armboot_real_end
-_armboot_real_end:
- .word 0x0badc0de
+.globl _bss_end
+_bss_end:
+ .word _end
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
bl cpu_init_crit
#endif
-relocate:
- /*
- * relocate armboot to RAM
- */
- adr r0, _start /* r0 <- current position of code */
+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, _armboot_end
- sub r2, r3, r2 /* r2 <- size of armboot */
- ldr r1, _TEXT_BASE /* r1 <- destination address */
- add r2, r0, r2 /* r2 <- source end address */
+ ldr r3, _bss_start
+ sub r2, r3, r2 /* r2 <- size of armboot */
+ add r2, r0, r2 /* r2 <- source end address */
- /*
- * r0 = source address
- * r1 = target address
- * r2 = source end address
- */
copy_loop:
- ldmia r0!, {r3-r10}
- stmia r1!, {r3-r10}
- cmp r0, r2
+ 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
- /* set up the stack */
- ldr r0, _armboot_end
- add r0, r0, #CONFIG_STACKSIZE
- sub sp, r0, #12 /* leave 3 words for abort-stack */
+ /* Set up the stack */
+stack_setup:
+ ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
+ sub r0, r0, #CFG_MALLOC_LEN /* malloc area */
+ sub r0, r0, #CFG_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
+ bne clbss_l
ldr pc, _start_armboot
mov pc, lr
-
-
/*
*************************************************************************
*
stmia sp, {r0 - r12} @ Calling r0-r12
add r8, sp, #S_PC
- ldr r2, _armboot_end
- add r2, r2, #CONFIG_STACKSIZE
- sub r2, r2, #8
+ ldr r2, _armboot_start
+ sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
.endm
.macro get_bad_stack
- ldr r13, _armboot_end @ setup our mode stack
- add r13, r13, #CONFIG_STACKSIZE @ resides at top of normal stack
- sub r13, r13, #8
+ ldr r13, _armboot_start @ setup our mode stack
+ sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr