option.a

s3c44b0的bootload程序

;ISR base
_ISR_STARTADDRESS   EQU   0x0c000000
_IRQ_BASEADDRESS    EQU   0x0c000000

;Bus width
                    GBLA    BUSWIDTH
BUSWIDTH  SETA      16

;DRAM or SDRAM
                    GBLS    BDRAMTYPE
BDRAMTYPE SETS      "SDRAM"

;PLL setting
                    GBLL    PLLONSTART
PLLONSTART          SETL    {TRUE}

                    GBLA    PLLCLK
PLLCLK              SETA    66000000

  [ PLLCLK = 66000000 
    ;Freq calc：
    ;Fout = (8+ M_DIV)*Fout/[(2+P_DIV)*2]
M_DIV   EQU     58      ;Fout = Fin * 2
P_DIV   EQU      3
S_DIV   EQU      1
  ]

;************************************************
  END