diff options
Diffstat (limited to 'cpu/ixp/start.S')
| -rw-r--r-- | cpu/ixp/start.S | 98 |
1 files changed, 48 insertions, 50 deletions
diff --git a/cpu/ixp/start.S b/cpu/ixp/start.S index de33e8b..d5fc9bf 100644 --- a/cpu/ixp/start.S +++ b/cpu/ixp/start.S @@ -31,37 +31,37 @@ #include <version.h> #include <asm/arch/ixp425.h> -#define MMU_Control_M 0x001 // Enable MMU -#define MMU_Control_A 0x002 // Enable address alignment faults -#define MMU_Control_C 0x004 // Enable cache -#define MMU_Control_W 0x008 // Enable write-buffer -#define MMU_Control_P 0x010 // Compatability: 32 bit code -#define MMU_Control_D 0x020 // Compatability: 32 bit data -#define MMU_Control_L 0x040 // Compatability: -#define MMU_Control_B 0x080 // Enable Big-Endian -#define MMU_Control_S 0x100 // Enable system protection -#define MMU_Control_R 0x200 // Enable ROM protection -#define MMU_Control_I 0x1000 // Enable Instruction cache -#define MMU_Control_X 0x2000 // Set interrupt vectors at 0xFFFF0000 +#define MMU_Control_M 0x001 /* Enable MMU */ +#define MMU_Control_A 0x002 /* Enable address alignment faults */ +#define MMU_Control_C 0x004 /* Enable cache */ +#define MMU_Control_W 0x008 /* Enable write-buffer */ +#define MMU_Control_P 0x010 /* Compatability: 32 bit code */ +#define MMU_Control_D 0x020 /* Compatability: 32 bit data */ +#define MMU_Control_L 0x040 /* Compatability: */ +#define MMU_Control_B 0x080 /* Enable Big-Endian */ +#define MMU_Control_S 0x100 /* Enable system protection */ +#define MMU_Control_R 0x200 /* Enable ROM protection */ +#define MMU_Control_I 0x1000 /* Enable Instruction cache */ +#define MMU_Control_X 0x2000 /* Set interrupt vectors at 0xFFFF0000 */ #define MMU_Control_Init (MMU_Control_P|MMU_Control_D|MMU_Control_L) /* * Macro definitions */ - // Delay a bit - .macro DELAY_FOR cycles, reg0 - ldr \reg0, =\cycles - subs \reg0, \reg0, #1 - subne pc, pc, #0xc - .endm - - // wait for coprocessor write complete - .macro CPWAIT reg - mrc p15,0,\reg,c2,c0,0 - mov \reg,\reg - sub pc,pc,#4 - .endm + /* Delay a bit */ + .macro DELAY_FOR cycles, reg0 + ldr \reg0, =\cycles + subs \reg0, \reg0, #1 + subne pc, pc, #0xc + .endm + + /* wait for coprocessor write complete */ + .macro CPWAIT reg + mrc p15,0,\reg,c2,c0,0 + mov \reg,\reg + sub pc,pc,#4 + .endm .globl _start _start: b reset @@ -160,15 +160,15 @@ reset: /* disable mmu, set big-endian */ mov r0, #0xf8 mcr p15, 0, r0, c1, c0, 0 - CPWAIT r0 + CPWAIT r0 /* invalidate I & D caches & BTB */ mcr p15, 0, r0, c7, c7, 0 CPWAIT r0 /* invalidate I & Data TLB */ - mcr p15, 0, r0, c8, c7, 0 - CPWAIT r0 + mcr p15, 0, r0, c8, c7, 0 + CPWAIT r0 /* drain write and fill buffers */ mcr p15, 0, r0, c7, c10, 4 @@ -185,7 +185,7 @@ reset: ldr r2, =IXP425_EXP_CS0 str r1, [r2] - /* make sure flash is visible at 0 */ + /* make sure flash is visible at 0 */ ldr r2, =IXP425_EXP_CFG0 ldr r1, [r2] orr r1, r1, #0x80000000 @@ -204,7 +204,7 @@ reset: mov r1, #3 ldr r4, =IXP425_SDR_IR str r1, [r4] - DELAY_FOR 0x4000, r0 + DELAY_FOR 0x4000, r0 /* set SDRAM internal refresh val */ ldr r1, =CFG_SDRAM_REFRESH_CNT @@ -235,31 +235,31 @@ reset: DELAY_FOR 0x4000, r0 /* copy */ - mov r0, #0 - mov r4, r0 - add r2, r0, #0x40000 + mov r0, #0 + mov r4, r0 + add r2, r0, #0x40000 mov r1, #0x10000000 - mov r5, r1 + mov r5, r1 30: - ldr r3, [r0], #4 - str r3, [r1], #4 - cmp r0, r2 - bne 30b + ldr r3, [r0], #4 + str r3, [r1], #4 + cmp r0, r2 + bne 30b /* invalidate I & D caches & BTB */ mcr p15, 0, r0, c7, c7, 0 CPWAIT r0 /* invalidate I & Data TLB */ - mcr p15, 0, r0, c8, c7, 0 - CPWAIT r0 + mcr p15, 0, r0, c8, c7, 0 + CPWAIT r0 /* drain write and fill buffers */ mcr p15, 0, r0, c7, c10, 4 CPWAIT r0 - /* move flash to 0x50000000 */ + /* move flash to 0x50000000 */ ldr r2, =IXP425_EXP_CFG0 ldr r1, [r2] bic r1, r1, #0x80000000 @@ -273,14 +273,14 @@ reset: nop /* invalidate I & Data TLB */ - mcr p15, 0, r0, c8, c7, 0 - CPWAIT r0 + mcr p15, 0, r0, c8, c7, 0 + CPWAIT r0 - /* enable I cache */ - mrc p15, 0, r0, c1, c0, 0 - orr r0, r0, #MMU_Control_I - mcr p15, 0, r0, c1, c0, 0 - CPWAIT r0 + /* enable I cache */ + mrc p15, 0, r0, c1, c0, 0 + orr r0, r0, #MMU_Control_I + mcr p15, 0, r0, c1, c0, 0 + CPWAIT r0 mrs r0,cpsr /* set the cpu to SVC32 mode */ bic r0,r0,#0x1f /* (superviser mode, M=10011) */ @@ -331,8 +331,6 @@ clbss_l:str r2, [r0] /* clear loop... */ _start_armboot: .word start_armboot - - /****************************************************************************/ /* */ /* Interrupt handling */ |