option.h

一个比较好的44B0的启动代码. 工程目录结构说明 --根目录 -- bootloader.apj, ARM Project Manager工程文件 -- INC目录, 头文件 -

#ifndef __OPTION_H__
#define __OPTION_H__

// ************* OPTIONS **************

#define MCLK (40000000)
#define PLLON 1

#if (MCLK==66000000)
#define PLL_M (0x3a)
#define PLL_P (0x3)
#define PLL_S (0x1)

#elif (MCLK==60000000)
#define PLL_M (0x34)
#define PLL_P (0x3)
#define PLL_S (0x1)

#elif (MCLK==40000000)
#define PLL_M (0x48)
#define PLL_P (0x3)
#define PLL_S (0x2)

#elif (MCLK==20000000)
#define PLL_M (0x48)
#define PLL_P (0x3)
#define PLL_S (0x3)
#endif

#define WRBUFOPT (0x8)   //write_buf_on

#define SYSCFG_8KBn (0x6)
#define SYSCFG_0KB (0x0|WRBUFOPT)
#define SYSCFG_4KB (0x2|WRBUFOPT)
#define SYSCFG_8KB (0x6|WRBUFOPT)

#define DRAM	    1		//In case DRAM is used
#define SDRAM	    2		//In case SDRAM is used
#define BDRAMTYPE   SDRAM	//used in power.c,44blib.c

#define BUSWIDTH    (16)

#define CACHECFG    SYSCFG_8KB

#define _RAM_STARTADDRESS 0xc000000	//8MB

#define _ISR_STARTADDRESS 0xc7fff00     //GCS6:64Mbit(8MB) DRAM/SDRAM

// NOTE: rom.mak,option.a have to be changed
#endif /*__OPTION_H__*/