diff options
Diffstat (limited to 'arch/m68k/cpu/mcf52x2')
| -rw-r--r-- | arch/m68k/cpu/mcf52x2/start.S | 163 |
1 files changed, 85 insertions, 78 deletions
diff --git a/arch/m68k/cpu/mcf52x2/start.S b/arch/m68k/cpu/mcf52x2/start.S index a048884f6c..9837c41894 100644 --- a/arch/m68k/cpu/mcf52x2/start.S +++ b/arch/m68k/cpu/mcf52x2/start.S @@ -34,12 +34,12 @@ #if !defined(CONFIG_MONITOR_IS_IN_RAM) .text + /* - * Vector table. This is used for initial platform startup. - * These vectors are to catch any un-intended traps. + * Vector table. This is used for initial platform startup. + * These vectors are to catch any un-intended traps. */ _vectors: - .long 0x00000000 /* Flash offset is 0 until we setup CS0 */ #if defined(CONFIG_M5282) && (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) .long _start - CONFIG_SYS_TEXT_BASE @@ -85,24 +85,24 @@ _vectors: #endif - .text - +.text #if defined(CONFIG_SYS_INT_FLASH_BASE) && \ (defined(CONFIG_M5282) || defined(CONFIG_M5281)) - #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) - .long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ - .long 0xFFFFFFFF /* all sectors protected */ - .long 0x00000000 /* supervisor/User restriction */ - .long 0x00000000 /* programm/data space restriction */ - .long 0x00000000 /* Flash security */ - #endif +#if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) +.long 0x55AA55AA,0xAA55AA55 /* CFM Backdoorkey */ +.long 0xFFFFFFFF /* all sectors protected */ +.long 0x00000000 /* supervisor/User restriction */ +.long 0x00000000 /* programm/data space restriction */ +.long 0x00000000 /* Flash security */ #endif - .globl _start +#endif + +.globl _start _start: nop nop - move.w #0x2700,%sr + move.w #0x2700,%sr #if defined(CONFIG_M5208) /* Initialize RAMBAR: locate SRAM and validate it */ @@ -111,22 +111,24 @@ _start: #endif #if defined(CONFIG_M5272) || defined(CONFIG_M5249) || defined(CONFIG_M5253) - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set MBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.c %d0, %MBAR /*** The 5249 has MBAR2 as well ***/ #ifdef CONFIG_SYS_MBAR2 - move.l #(CONFIG_SYS_MBAR2 + 1), %d0 /* Get MBAR2 address */ - movec %d0, #0xc0e /* Set MBAR2 */ + /* Get MBAR2 address */ + move.l #(CONFIG_SYS_MBAR2 + 1), %d0 + /* Set MBAR2 */ + movec %d0, #0xc0e #endif - move.l #(CONFIG_SYS_INIT_RAM_ADDR + 1), %d0 movec %d0, %RAMBAR0 #endif /* CONFIG_M5272 || CONFIG_M5249 || CONFIG_M5253 */ #if defined(CONFIG_M5282) || defined(CONFIG_M5271) - /* Initialize IPSBAR */ - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.l %d0, 0x40000000 /* Initialize RAMBAR1: locate SRAM and validate it */ @@ -135,22 +137,24 @@ _start: #if defined(CONFIG_M5282) #if (CONFIG_SYS_TEXT_BASE == CONFIG_SYS_INT_FLASH_BASE) - /* Setup code in SRAM to initialize FLASHBAR, if start from internal Flash */ - - move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 - move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 - move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 + /* + * Setup code in SRAM to initialize FLASHBAR, + * if start from internal Flash + */ + move.l #(_flashbar_setup-CONFIG_SYS_INT_FLASH_BASE), %a0 + move.l #(_flashbar_setup_end-CONFIG_SYS_INT_FLASH_BASE), %a1 + move.l #(CONFIG_SYS_INIT_RAM_ADDR), %a2 _copy_flash: - move.l (%a0)+, (%a2)+ - cmp.l %a0, %a1 - bgt.s _copy_flash - jmp CONFIG_SYS_INIT_RAM_ADDR + move.l (%a0)+, (%a2)+ + cmp.l %a0, %a1 + bgt.s _copy_flash + jmp CONFIG_SYS_INIT_RAM_ADDR _flashbar_setup: /* Initialize FLASHBAR: locate internal Flash and validate it */ move.l #(CONFIG_SYS_INT_FLASH_BASE + CONFIG_SYS_INT_FLASH_ENABLE), %d0 movec %d0, %FLASHBAR - jmp _after_flashbar_copy.L /* Force jump to absolute address */ + jmp _after_flashbar_copy.L /* Force jump to absolute address */ _flashbar_setup_end: nop _after_flashbar_copy: @@ -162,7 +166,8 @@ _after_flashbar_copy: #endif #endif - /* if we come from a pre-loader we have no exception table and + /* + * if we come from a pre-loader we have no exception table and * therefore no VBR to set */ #if !defined(CONFIG_MONITOR_IS_IN_RAM) @@ -175,8 +180,8 @@ _after_flashbar_copy: #endif #ifdef CONFIG_M5275 - /* Initialize IPSBAR */ - move.l #(CONFIG_SYS_MBAR + 1), %d0 /* set IPSBAR address + valid flag */ + /* set MBAR address + valid flag */ + move.l #(CONFIG_SYS_MBAR + 1), %d0 move.l %d0, 0x40000000 /* movec %d0, %MBAR */ @@ -186,17 +191,17 @@ _after_flashbar_copy: #endif /* initialize general use internal ram */ - move.l #0, %d0 - move.l #(ICACHE_STATUS), %a1 /* icache */ - move.l #(DCACHE_STATUS), %a2 /* icache */ - move.l %d0, (%a1) - move.l %d0, (%a2) + move.l #0, %d0 + move.l #(ICACHE_STATUS), %a1 /* icache */ + move.l #(DCACHE_STATUS), %a2 /* icache */ + move.l %d0, (%a1) + move.l %d0, (%a2) /* put relocation table address to a5 */ - move.l #__got_start, %a5 + move.l #__got_start, %a5 /* setup stack initially on top of internal static ram */ - move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp + move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp /* * if configured, malloc_f arena will be reserved first, @@ -204,28 +209,29 @@ _after_flashbar_copy: */ move.l %sp, -(%sp) move.l #board_init_f_alloc_reserve, %a1 - jsr (%a1) + jsr (%a1) /* update stack and frame-pointers */ - move.l %d0, %sp - move.l %sp, %fp + move.l %d0, %sp + move.l %sp, %fp /* initialize reserved area */ - move.l %d0, -(%sp) + move.l %d0, -(%sp) move.l #board_init_f_init_reserve, %a1 - jsr (%a1) + jsr (%a1) /* run low-level CPU init code (from flash) */ - move.l #cpu_init_f, %a1 - jsr (%a1) + move.l #cpu_init_f, %a1 + jsr (%a1) + /* run low-level board init code (from flash) */ - clr.l %sp@- - move.l #board_init_f, %a1 - jsr (%a1) + clr.l %sp@- + move.l #board_init_f, %a1 + jsr (%a1) /* board_init_f() does not return */ -/*------------------------------------------------------------------------------*/ +/******************************************************************************/ /* * void relocate_code (addr_sp, gd, addr_moni) @@ -238,22 +244,22 @@ _after_flashbar_copy: * r5 = length in bytes * r6 = cachelinesize */ - .globl relocate_code +.globl relocate_code relocate_code: - link.w %a6,#0 - move.l 8(%a6), %sp /* set new stack pointer */ + link.w %a6,#0 + move.l 8(%a6), %sp /* set new stack pointer */ - move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ - move.l 16(%a6), %a0 /* Save copy of Destination Address */ + move.l 12(%a6), %d0 /* Save copy of Global Data pointer */ + move.l 16(%a6), %a0 /* Save copy of Destination Address */ - move.l #CONFIG_SYS_MONITOR_BASE, %a1 - move.l #__init_end, %a2 - move.l %a0, %a3 + move.l #CONFIG_SYS_MONITOR_BASE, %a1 + move.l #__init_end, %a2 + move.l %a0, %a3 /* copy the code to RAM */ 1: - move.l (%a1)+, (%a3)+ - cmp.l %a1,%a2 - bgt.s 1b + move.l (%a1)+, (%a3)+ + cmp.l %a1,%a2 + bgt.s 1b /* * We are done. Do not return, instead branch to second part of board @@ -283,7 +289,7 @@ clear_bss: */ move.l %a0, %a1 add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1 - move.l %a1,%a5 /* * fix got pointer register a5 */ + move.l %a1,%a5 /* fix got pointer register a5 */ move.l %a0, %a2 add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2 @@ -297,43 +303,44 @@ clear_bss: bne 7b /* calculate relative jump to board_init_r in ram */ - move.l %a0, %a1 - add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 + move.l %a0, %a1 + add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1 /* set parameters for board_init_r */ - move.l %a0,-(%sp) /* dest_addr */ - move.l %d0,-(%sp) /* gd */ + move.l %a0,-(%sp) /* dest_addr */ + move.l %d0,-(%sp) /* gd */ #if defined(DEBUG) && (CONFIG_SYS_TEXT_BASE != CONFIG_SYS_INT_FLASH_BASE) && \ defined(CONFIG_SYS_HALT_BEFOR_RAM_JUMP) halt #endif jsr (%a1) -/*------------------------------------------------------------------------------*/ +/******************************************************************************/ + /* exception code */ - .globl _fault +.globl _fault _fault: - bra _fault + bra _fault - .globl _exc_handler +.globl _exc_handler _exc_handler: SAVE_ALL movel %sp,%sp@- - bsr exc_handler + bsr exc_handler addql #4,%sp RESTORE_ALL - .globl _int_handler +.globl _int_handler _int_handler: SAVE_ALL movel %sp,%sp@- - bsr int_handler + bsr int_handler addql #4,%sp RESTORE_ALL -/*------------------------------------------------------------------------------*/ +/******************************************************************************/ - .globl version_string +.globl version_string version_string: - .ascii U_BOOT_VERSION_STRING, "\0" - .align 4 +.ascii U_BOOT_VERSION_STRING, "\0" +.align 4 |