diff options
Diffstat (limited to 'arch/m68k/platform/68328/head-ram.S')
| -rw-r--r-- | arch/m68k/platform/68328/head-ram.S | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/m68k/platform/68328/head-ram.S b/arch/m68k/platform/68328/head-ram.S new file mode 100644 index 00000000000..7f1aeeacb21 --- /dev/null +++ b/arch/m68k/platform/68328/head-ram.S @@ -0,0 +1,141 @@ + + .global __main + .global __rom_start + + .global _rambase + .global _ramstart + + .global splash_bits + .global _start + .global _stext + .global _edata + +#define DEBUG +#define ROM_OFFSET 0x10C00000 +#define STACK_GAURD 0x10 + + .text + +_start: +_stext: + movew #0x2700, %sr /* Exceptions off! */ + +#if 0 + /* Init chip registers. uCsimm specific */ + moveb #0x00, 0xfffffb0b /* Watchdog off */ + moveb #0x10, 0xfffff000 /* SCR */ + + movew #0x2400, 0xfffff200 /* PLLCR */ + movew #0x0123, 0xfffff202 /* PLLFSR */ + + moveb #0x00, 0xfffff40b /* enable chip select */ + moveb #0x00, 0xfffff423 /* enable /DWE */ + moveb #0x08, 0xfffffd0d /* disable hardmap */ + moveb #0x07, 0xfffffd0e /* level 7 interrupt clear */ + + movew #0x8600, 0xfffff100 /* FLASH at 0x10c00000 */ + movew #0x018b, 0xfffff110 /* 2Meg, enable, 0ws */ + + movew #0x8f00, 0xfffffc00 /* DRAM configuration */ + movew #0x9667, 0xfffffc02 /* DRAM control */ + movew #0x0000, 0xfffff106 /* DRAM at 0x00000000 */ + movew #0x068f, 0xfffff116 /* 8Meg, enable, 0ws */ + + moveb #0x40, 0xfffff300 /* IVR */ + movel #0x007FFFFF, %d0 /* IMR */ + movel %d0, 0xfffff304 + + moveb 0xfffff42b, %d0 + andb #0xe0, %d0 + moveb %d0, 0xfffff42b + + moveb #0x08, 0xfffff907 /* Ignore CTS */ + movew #0x010b, 0xfffff902 /* BAUD to 9600 */ + movew #0xe100, 0xfffff900 /* enable */ +#endif + + movew #16384, %d0 /* PLL settle wait loop */ +L0: + subw #1, %d0 + bne L0 +#ifdef DEBUG + moveq #70, %d7 /* 'F' */ + moveb %d7,0xfffff907 /* No absolute addresses */ +pclp1: + movew 0xfffff906, %d7 + andw #0x2000, %d7 + beq pclp1 +#endif /* DEBUG */ + +#ifdef DEBUG + moveq #82, %d7 /* 'R' */ + moveb %d7,0xfffff907 /* No absolute addresses */ +pclp3: + movew 0xfffff906, %d7 + andw #0x2000, %d7 + beq pclp3 +#endif /* DEBUG */ + moveal #0x007ffff0, %ssp + moveal #_sbss, %a0 + moveal #_ebss, %a1 + + /* Copy 0 to %a0 until %a0 >= %a1 */ +L1: + movel #0, %a0@+ + cmpal %a0, %a1 + bhi L1 + +#ifdef DEBUG + moveq #67, %d7 /* 'C' */ + jsr putc +#endif /* DEBUG */ + + pea 0 + pea env + pea %sp@(4) + pea 0 + +#ifdef DEBUG + moveq #70, %d7 /* 'F' */ + jsr putc +#endif /* DEBUG */ + +lp: + jsr start_kernel + jmp lp +_exit: + + jmp _exit + +__main: + /* nothing */ + rts + +#ifdef DEBUG +putc: + moveb %d7,0xfffff907 +pclp: + movew 0xfffff906, %d7 + andw #0x2000, %d7 + beq pclp + rts +#endif /* DEBUG */ + + .data + +/* + * Set up the usable of RAM stuff. Size of RAM is determined then + * an initial stack set up at the end. + */ +.align 4 +_ramvec: +.long 0 +_rambase: +.long 0 +_ramstart: +.long 0 +_ramend: +.long 0 + +env: + .long 0 |