diff options
Diffstat (limited to 'cpu/arm920t/start.S')
| -rwxr-xr-x | cpu/arm920t/start.S | 126 |
1 files changed, 21 insertions, 105 deletions
diff --git a/cpu/arm920t/start.S b/cpu/arm920t/start.S index 1bc6099..df2ee20 100755 --- a/cpu/arm920t/start.S +++ b/cpu/arm920t/start.S @@ -27,7 +27,7 @@ #include <config.h> #include <version.h> -#include <asm/led.h> +#include <asm/coloured_led.h> /* ************************************************************************* @@ -39,7 +39,7 @@ .globl _start -_start: b reset +_start: b start_code ldr pc, _undefined_instruction ldr pc, _software_interrupt ldr pc, _prefetch_abort @@ -62,7 +62,7 @@ _fiq: .word fiq /* ************************************************************************* * - * Startup Code (reset vector) + * Startup Code (called from the ARM reset exception vector) * * do important init only if we don't start from memory! * relocate armboot to ram @@ -104,10 +104,10 @@ FIQ_STACK_START: /* - * the actual reset code + * the actual start code */ -reset: +start_code: /* * set the cpu to SVC32 mode */ @@ -115,59 +115,13 @@ reset: bic r0,r0,#0x1f orr r0,r0,#0xd3 msr cpsr,r0 - /* - * if board has a red led use it to show U-Boot is running - */ + bl coloured_LED_init bl red_LED_on -#ifdef CONFIG_AT91RM9200 -#ifdef CONFIG_BOOTBINFUNC -/* code based on entry.S from ATMEL */ -#define AT91C_BASE_CKGR 0xFFFFFC20 -#define CKGR_MOR 0 - /* Get the CKGR Base Address */ - ldr r1, =AT91C_BASE_CKGR - -/* Main oscillator Enable register APMC_MOR : Enable main oscillator , OSCOUNT = 0xFF */ -/* ldr r0, = AT91C_CKGR_MOSCEN:OR:AT91C_CKGR_OSCOUNT */ - ldr r0, =0x0000FF01 - str r0, [r1, #CKGR_MOR] - /* Add loop to compensate Main Oscillator startup time */ - ldr r0, =0x00000010 -LoopOsc: - subs r0, r0, #1 - bhi LoopOsc - /* scratch stack */ - ldr r1, =0x00204000 - /* Insure word alignment */ - bic r1, r1, #3 - /* Init stack SYS */ - mov sp, r1 - /* - * This does a lot more than just set up the memory, which - * is why it's called lowlevelinit - */ - bl lowlevelinit /* in memsetup.S */ - bl icache_enable; - /* ------------------------------------ - * Read/modify/write CP15 control register - * ------------------------------------- - * read cp15 control register (cp15 r1) in r0 - * ------------------------------------ - */ - mrc p15, 0, r0, c1, c0, 0 - /* Reset bit :Little Endian end fast bus mode */ - ldr r3, =0xC0000080 - /* Set bit :Asynchronous clock mode, Not Fast Bus */ - ldr r4, =0xC0000000 - bic r0, r0, r3 - orr r0, r0, r4 - /* write r0 in cp15 control register (cp15 r1) */ - mcr p15, 0, r0, c1, c0, 0 -#endif /* CONFIG_BOOTBINFUNC */ +#if defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK) || defined(CONFIG_AT91RM9200DF) /* - * relocate exeception table + * relocate exception table */ ldr r0, =_start ldr r1, =0x0 @@ -179,19 +133,20 @@ copyex: bne copyex #endif -/* turn off the watchdog */ -#if defined(CONFIG_S3C2400) -# define pWTCON 0x15300000 -# define INTMSK 0x14400008 /* Interupt-Controller base addresses */ -# define CLKDIVN 0x14800014 /* clock divisor register */ -#elif defined(CONFIG_S3C2410) -# define pWTCON 0x53000000 -# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */ -# define INTSUBMSK 0x4A00001C -# define CLKDIVN 0x4C000014 /* clock divisor register */ -#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] @@ -224,25 +179,7 @@ copyex: #endif #ifdef CONFIG_AT91RM9200 -#ifdef CONFIG_BOOTBINFUNC -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_BOOTBINFUNC */ -#else #ifndef CONFIG_SKIP_RELOCATE_UBOOT relocate: /* relocate U-Boot to RAM */ adr r0, _start /* r0 <- current position of code */ @@ -282,27 +219,6 @@ clbss_l:str r2, [r0] /* clear loop... */ cmp r0, r1 ble clbss_l -#if 0 - /* try doing this stuff after the relocation */ - 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, =INTMR - str r1, [r0] - - /* FCLK:HCLK:PCLK = 1:2:4 */ - /* default FCLK is 120 MHz ! */ - ldr r0, =CLKDIVN - mov r1, #3 - str r1, [r0] - /* END stuff after relocation */ -#endif - ldr pc, _start_armboot _start_armboot: .word start_armboot |