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3 °áÔË´úÂëµÄʵÏÖ·½·¨

¡¡¡¡ÏÂÃæ½áºÏ¼Ù¶¨µÄÓ²¼þƽ̨£¬ÏêϸÃèÊöÎïÀí´æ´¢Æ÷µØÖ·Öض¨Î»£¬´úÂë°áÔ˵ÄÔ­Àí¼°¹ý³Ì¡£ÎÒÃDZàдÁ½¸öcÎļþ¡ª¡ªRomTool.c¡¢RAMapp.c¡£

¡¡¡¡RomTool.cÍê³É860T³õʼ»¯£¬SDRAMµÄˢУ¬Öжϼ°ÍâÉèµÄ³õʼ»¯£»Flashµ½SDRAMµÄ´úÂë°áÔËÇý¶¯Ä£¿é¼°Ìø×ªÄ£¿é¡£¶ÔÓ¦µÄ¶þ½øÖÆÓ³ÏñÎļþΪRomTool.bin¡£

¡¡¡¡RAMapp.cÊÇʵ¼ÊµÄÓ¦ÓóÌÐò, ¶ÔÓ¦µÄ¶þ½øÖÆÓ³ÏñÎļþΪRAMapp .bin¡£RAMapp.bin±»°áÔ˺óÔÚSDRAMÖÐÔËÐС£

3.1 ÎïÀí´æ´¢Æ÷µØÖ·Ó³É乿Ôò

¡¡¡¡RomTool.cµÄÎïÀíµØÖ·Ó³É乿ÔòΪ£ºÊý¾Ý·ÅÔÚÆðʼΪ0x3000£¬´óСΪ0xf0000µÄSDRAM¿Õ¼äÀ´úÂë±»ÉÕ½áÔÚÆðʼΪ0x02800000£¬´óСΪ0x10000µÄFlash¿Õ¼äÀ²»»á±»°áÔË£¬Ò²ÔڸÿռäÀïÔËÐС£
ËùÒÔÔÚRomTool.lnxÖÐÖ¸¶¨µÄ¶¨Î»¹æÔòÒ²Ó¦¸ÃÊÇÕâ¸öµØÖ··¶Î§£¬ÈçÏ£º
MEMORY
{
ram1: ORIGIN = 0x00003000, LENGTH = 0xf000
flash: ORIGIN = 0x02800000, LENGTH = 0x1000
}
SECTIONS
{
.data : {} > ram1
.text : {} > flash
}

¡¡¡¡RamApp.cµÄÎïÀíµØÖ·Ó³É乿ÔòΪ£º

¡¡¡¡Êý¾Ý·ÅÔÚÆðʼΪ0x3000£¬´óСΪ0xf0000µÄ¿Õ¼äÀ´úÂë±»ÉÕ½áÔÚÆðʼΪ0x02810000£¬´óСΪ0x70000µÄFlashÖУ¬ËüÒª±»°áÔ˵½ÆðʼΪ0x00F00000£¬´óСΪ0x70000µÄSDRAM¿Õ¼äÀ¼´RamApp.Binʵ¼ÊÔÚSDRAMÖÐÔËÐС£

¡¡¡¡ËùÒÔ£¬ÔÚRamApp.lnxÖÐÖ¸¶¨µÄ¶¨Î»¹æÔòÓ¦¸ÃÔÚSDRAMÖУ¬ÈçÏ£º
MEMORY
{
ram1: ORIGIN = 0x00003000, LENGTH = 0xf000
ram: ORIGIN = 0x00F00000, LENGTH = 0x7000
}
SECTIONS
{
.data : {} > ram1
.text : {} > ram
}

¡¡¡¡×îºó£¬ÔÚ860µ¥Æ¬»úϵͳµÄµØÖ·Ó³É乿ÔòÈçͼ2Ëùʾ¡£¶ÔÕÕͼ1£¬¿ÉÒԹ۲쵽ÕâºÍ´«Í³µÄ³ÌÐòµØÖ·Ó³ÉäÓкܴó²»Í¬¡£
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3.2 °áÔ˵Ĺý³Ì

¡¡¡¡860TÉϵ縴룬RomTool.binÊ×Ïȱ»Ö´ÐУ¬Íê³É³õʼ»¯¹¤×÷ºó£¬ÔËÐдúÂë°áÔ˺¯Êý£¬½«RAMapp.bin°áÔ˵½SDRAMÖУ¬Ëæºó¸Ä±äPC(Program Counter)µÄÖµ£¬ÎÞÌõ¼þ×ªÒÆµ½SDRAMÖÐÔËÐÐRAMapp.bin£¬Èçͼ3Ëùʾ¡£
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3.3 °áÔË´úÂëµÄÇý¶¯Ä£¿é¼°Ìø×ªÄ£¿éÔ´´úÂë

(1)°áÔË´úÂëÇý¶¯Ä£¿éµÄ´úÂë
void MoveCodeF_to_RAM(UWORD *FlashCode_Add, UWORD *RamCode_Add,UWORD CodeLen) {
do{
*RamCode_Add++ = *FlashCode_Add++;
CodeLen?
} while ( CodeLen!=0)
}
¸Ã¶Î´úÂëÊǽ«¿ªÊ¼µØÖ·ÎªFlashCode_Add£¬³¤¶ÈΪCodeLenµÄFlash´úÂë°áÔ˵½¿ªÊ¼µØÖ·ÎªRamCode_Add£¬³¤¶ÈΪCodeLenµÄSDRAM ÖС£

(2)Ö÷º¯Êý¼°Ìø×ªÄ£¿é
#define FlashCode_Add_V 0x02810000
#define RamCode_Add_V 0x00f00000
#define CodeLen_V 0x00070000/4
void main(){
UWORD *I=(UWORD *) FlashCode_Add_v;
UWORD *j= (UWORD *) RamCode_Add_v;
UWORD *k= (UWORD *) CodeLen_V;
MoveCodeF_to_RAM( (UWORD *) i, (UWORD *) j, (UWORD *)k );
# Ìø×ªÄ£¿é
asm("addis r2,0,0x00f0";
asm("ori r2,r2,0x0000"; # ´úÂëÆðʼµØÖ·0x00f00000
asm("mtspr LR,r2";
asm("bclr 20,0"; # ÎÞÌõ¼þ×ªÌøµ½Á´½Ó¼Ä´æÆ÷
# (LR)ÖеĵØÖ·
}
FlashCode_Add_V£º±»°áÔË´úÂëµÄÊ×µØÖ·£¬ÔÚFlashÖС£
RamCode_Add_V£º±»°áÔË´úÂëµÄÄ¿±êµØÖ·£¬ÔÚRAMÖС£
CodeLen_V£º±»°áÔË´úÂëµÄ³¤¶È£¬°´32λ¼ÆËã¡£
¸Ãº¯ÊýÔÚµ÷ÓôúÂë°áÔËMoveCodeF_to_RAMº¯Êý£¬½«´úÂë´ÓFlash°áÔ˵½SDRAMÖк󣬽«³ÌÐòÖ¸Õë×ªÒÆµ½SDRAMÖС£×¢ÒâÌø×ªµÄµØÖ·Ò»¶¨ÒªºÍRamCode_Add_VÒ»Ö¡£

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[ Last edited by sdlj8051 on 2006-10-5 at 19:20 ]
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