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sh: Move cpu/$CPU to arch/sh/cpu/$CPU
[oweals/u-boot.git] / cpu / arm926ejs / start.S
diff --git a/cpu/arm926ejs/start.S b/cpu/arm926ejs/start.S
index fc6b20b21e3f1c4d8a631238ea6883e3c8578438..3b81151f49cecaa0b42875ed031b8e3f313cc1c6 100644 (file)
--- a/cpu/arm926ejs/start.S
+++ b/cpu/arm926ejs/start.S
@@ -7,7 +7,7 @@
  *
  *  Copyright (c) 2001 Marius Gröger <mag@sysgo.de>
  *  Copyright (c) 2002 Alex Züpke <azu@sysgo.de>
- *  Copyright (c) 2002 Gary Jennejohn <gj@denx.de>
+ *  Copyright (c) 2002 Gary Jennejohn <garyj@denx.de>
  *  Copyright (c) 2003 Richard Woodruff <r-woodruff2@ti.com>
  *  Copyright (c) 2003 Kshitij <kshitij@ti.com>
  *
@@ -32,6 +32,7 @@
 
 
 #include <config.h>
+#include <common.h>
 #include <version.h>
 
 #if defined(CONFIG_OMAP1610)
@@ -52,6 +53,27 @@
 .globl _start
 _start:
        b       reset
+#ifdef CONFIG_PRELOADER
+/* No exception handlers in preloader */
+       ldr     pc, _hang
+       ldr     pc, _hang
+       ldr     pc, _hang
+       ldr     pc, _hang
+       ldr     pc, _hang
+       ldr     pc, _hang
+       ldr     pc, _hang
+
+_hang:
+       .word   do_hang
+/* pad to 64 byte boundary */
+       .word   0x12345678
+       .word   0x12345678
+       .word   0x12345678
+       .word   0x12345678
+       .word   0x12345678
+       .word   0x12345678
+       .word   0x12345678
+#else
        ldr     pc, _undefined_instruction
        ldr     pc, _software_interrupt
        ldr     pc, _prefetch_abort
@@ -75,6 +97,7 @@ _irq:
 _fiq:
        .word fiq
 
+#endif /* CONFIG_PRELOADER */
        .balignl 16,0xdeadbeef
 
 
@@ -149,7 +172,6 @@ relocate:                           /* relocate U-Boot to RAM           */
        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            */
@@ -165,27 +187,40 @@ copy_loop:
        /* 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                        */
+       sub     sp, r0, #128            /* leave 32 words for abort-stack   */
+#ifndef CONFIG_PRELOADER
+       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
+#endif /* CONFIG_PRELOADER */
        sub     sp, r0, #12             /* leave 3 words for abort-stack    */
+       bic     sp, r0, #7              /* 8-byte align stack for ABI compliance */
 
 clear_bss:
        ldr     r0, _bss_start          /* find start of bss segment        */
        ldr     r1, _bss_end            /* stop here                        */
-       mov     r2, #0x00000000         /* clear                            */
+       mov     r2, #0x00000000         /* clear                            */
 
+#ifndef CONFIG_PRELOADER
 clbss_l:str    r2, [r0]                /* clear loop...                    */
        add     r0, r0, #4
        cmp     r0, r1
        ble     clbss_l
 
+       bl coloured_LED_init
+       bl red_LED_on
+#endif /* CONFIG_PRELOADER */
+
        ldr     pc, _start_armboot
 
 _start_armboot:
+#ifdef CONFIG_NAND_SPL
+       .word nand_boot
+#else
        .word start_armboot
+#endif /* CONFIG_NAND_SPL */
 
 
 /*
@@ -198,8 +233,7 @@ _start_armboot:
  *
  *************************************************************************
  */
-
-
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
 cpu_init_crit:
        /*
         * flush v4 I/D caches
@@ -225,6 +259,9 @@ cpu_init_crit:
        bl      lowlevel_init   /* go setup pll,mux,memory */
        mov     lr, ip          /* restore link */
        mov     pc, lr          /* back to my caller */
+#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
+
+#ifndef CONFIG_PRELOADER
 /*
  *************************************************************************
  *
@@ -272,8 +309,8 @@ cpu_init_crit:
        stmia   sp, {r0 - r12}  @ Save user registers (now in svc mode) r0-r12
 
        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
+       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
        @ 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
@@ -306,8 +343,8 @@ cpu_init_crit:
 
        .macro get_bad_stack
        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
+       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
 
        str     lr, [r13]       @ save caller lr in position 0 of saved stack
        mrs     lr, spsr        @ get the spsr
@@ -326,10 +363,18 @@ cpu_init_crit:
        .macro get_fiq_stack                    @ setup FIQ stack
        ldr     sp, FIQ_STACK_START
        .endm
+#endif /* CONFIG_PRELOADER */
 
 /*
  * exception handlers
  */
+#ifdef CONFIG_PRELOADER
+       .align  5
+do_hang:
+       ldr     sp, _TEXT_BASE                  /* switch to abort stack */
+1:
+       bl      1b                              /* hang and never return */
+#else  /* !CONFIG_PRELOADER */
        .align  5
 undefined_instruction:
        get_bad_stack
@@ -366,7 +411,7 @@ not_used:
 irq:
        get_irq_stack
        irq_save_user_regs
-       bl      do_irq
+       bl      do_irq
        irq_restore_user_regs
 
        .align  5
@@ -374,7 +419,7 @@ fiq:
        get_fiq_stack
        /* someone ought to write a more effiction fiq_save_user_regs */
        irq_save_user_regs
-       bl      do_fiq
+       bl      do_fiq
        irq_restore_user_regs
 
 #else
@@ -392,25 +437,4 @@ fiq:
        bl      do_fiq
 
 #endif
-
-# ifdef CONFIG_INTEGRATOR
-
-       /* Satisfied by Integrator routine (AP or CP) */
-
-#else
-
-       .align  5
-.globl reset_cpu
-reset_cpu:
-       ldr     r1, rstctl1     /* get clkm1 reset ctl */
-       mov     r3, #0x0
-       strh    r3, [r1]        /* clear it */
-       mov     r3, #0x8
-       strh    r3, [r1]        /* force dsp+arm reset */
-_loop_forever:
-       b       _loop_forever
-
-rstctl1:
-       .word   0xfffece10
-
-#endif /* #ifdef CONFIG_INTEGRATOR */
+#endif /* CONFIG_PRELOADER */
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