我用的板子是基于三星的2410，三星的內(nèi)存片選有8個bank，這里所謂的bank我開始也不是很清楚，在網(wǎng)上搜了一通也不知所云，但是當(dāng)我看了 2410的用戶手冊后才有點(diǎn)明白，這里的bank就是片選，一個片選就是一個bank，在U-Boot中，配制的時候要配制SDRAM和FLASH的 bank數(shù)，那么如果你的SDRAM或者FLASH就接了一個片選的時候，就定義為1就可以了，其他的類推。
下面是2410的內(nèi)存映射圖，2410和其他的大部分的處理器一樣，支持NorFlash和NANDFlash啟動，而這兩種啟動方式內(nèi)存所映射的地址不怎么相同，我的板子沒有NANDFlash，所以就以從NorFlash啟動為例子了：
==============================================<-------0xFFFF_FFFF
| NOT USED
==============================================<-------0x6000_0000
| SFR Area （各個接口的控制寄存器）
==============================================<-------0x4800_0000
==============================================<-------0x4000_0FFF
| BootSRAM (4KBytes)
==============================================<-------0x4000_0000
| SROM/SDRAM nGCS7 (bank7)
==============================================<-------0x3800_0000
| SROM/SDRAM nGCS6 (bank6)
==============================================<-------0x3000_0000
| SROM nGCS5 (bank5)
==============================================<-------0x2800_0000
| SROM nGCS4 (bank4)
==============================================<-------0x2000_0000
| SROM nGCS3 (bank3)
==============================================<-------0x1800_0000
| SROM nGCS2 (bank2)
==============================================<-------0x1000_0000
| SROM nGCS1 (bank1)
==============================================<-------0x0800_0000
| SROM nGCS0 (bank0)
==============================================<-------0x0000_0000
上面的每個bank最大支持128M，除了bank0，其它的每個bank都支持8/16/32位操作，bank0只支持16/32位操作，在我的板子上，F(xiàn)lash接bank0，一共8M，16位，SDRAM接bank6，一個32M，32位。所以啟動的時候，CPU從0x0000_0000開始執(zhí)行，而在這上面的NorFlash，存放的是U-Boot，用于啟動Linux的。
而我們目前所做的工作就是要把U-Boot移植成功，然后燒寫到該地址，假設(shè)你的板子的供應(yīng)商已經(jīng)提供了少些的工具，等到我們少些成功，我們就可以通過網(wǎng)絡(luò)來加載Linux，通過串口來調(diào)試了，至于怎么做的，我們慢慢來，以后的帖子會涉及到。。。
在上面的存儲地址布局中，SFR Area就是各個接口控制器的地址，我們可以把它定義如下，來自華恒PPCboot上面的源代碼中的頭文件s3c2410.h：

#define rBWSCON (*(volatile unsigned *)0x48000000)
#define rBANKCON0 (*(volatile unsigned *)0x48000004)
#define rBANKCON1 (*(volatile unsigned *)0x48000008)
#define rBANKCON2 (*(volatile unsigned *)0x4800000C)
#define rBANKCON3 (*(volatile unsigned *)0x48000010)
#define rBANKCON4 (*(volatile unsigned *)0x48000014)
#define rBANKCON5 (*(volatile unsigned *)0x48000018)
#define rBANKCON6 (*(volatile unsigned *)0x4800001C)
#define rBANKCON7 (*(volatile unsigned *)0x48000020)
#define rREFRESH (*(volatile unsigned *)0x48000024)
#define rBANKSIZE (*(volatile unsigned *)0x48000028)
#define rMRSRB6 (*(volatile unsigned *)0x4800002C)
#define rMRSRB7 (*(volatile unsigned *)0x48000030)

#define rHcRevision (*(volatile unsigned *)0x49000000)
#define rHcControl (*(volatile unsigned *)0x49000004)
#define rHcCommonStatus (*(volatile unsigned *)0x49000008)
#define rHcInterruptStatus (*(volatile unsigned *)0x4900000C)
#define rHcInterruptEnable (*(volatile unsigned *)0x49000010)
#define rHcInterruptDisable (*(volatile unsigned *)0x49000014)
#define rHcHCCA (*(volatile unsigned *)0x49000018)
#define rHcPeriodCuttendED (*(volatile unsigned *)0x4900001C)
#define rHcControlHeadED (*(volatile unsigned *)0x49000020)
#define rHcControlCurrentED (*(volatile unsigned *)0x49000024)
#define rHcBulkHeadED (*(volatile unsigned *)0x49000028)
#define rHcBuldCurrentED (*(volatile unsigned *)0x4900002C)
#define rHcDoneHead (*(volatile unsigned *)0x49000030)
#define rHcRmInterval (*(volatile unsigned *)0x49000034)
#define rHcFmRemaining (*(volatile unsigned *)0x49000038)
#define rHcFmNumber (*(volatile unsigned *)0x4900003C)
#define rHcPeriodicStart (*(volatile unsigned *)0x49000040)
#define rHcLSThreshold (*(volatile unsigned *)0x49000044)
#define rHcRhDescriptorA (*(volatile unsigned *)0x49000048)
#define rHcRhDescriptorB (*(volatile unsigned *)0x4900004C)
#define rHcRhStatus (*(volatile unsigned *)0x49000050)
#define rHcRhPortStatus1 (*(volatile unsigned *)0x49000054)
#define rHcRhPortStatus2 (*(volatile unsigned *)0x49000058)

#define rSRCPND (*(volatile unsigned *)0x4A000000)
#define rINTMOD (*(volatile unsigned *)0x4A000004)
#define rINTMSK (*(volatile unsigned *)0x4A000008)
#define rPRIORITY (*(volatile unsigned *)0x4A00000C)
#define rINTPND (*(volatile unsigned *)0x4A000010)
#define rINTOFFSET (*(volatile unsigned *)0x4A000014)
#define rSUBSRCPND (*(volatile unsigned *)0x4A000018)
#define rINTSUBMSK (*(volatile unsigned *)0x4A00001C)

#define rULCON0 (*(volatile unsigned *)0x50000000)
#define rUCON0 (*(volatile unsigned *)0x50000004)
#define rUFCON0 (*(volatile unsigned *)0x50000008)
#define rUMCON0 (*(volatile unsigned *)0x5000000C)
#define rUTRSTAT0 (*(volatile unsigned *)0x50000010)
#define rUERSTAT0 (*(volatile unsigned *)0x50000014)
#define rUFSTAT0 (*(volatile unsigned *)0x50000018)
#define rUMSTAT0 (*(volatile unsigned *)0x5000001C)
#define rUBRDIV0 (*(volatile unsigned *)0x50000028)
#define rULCON1 (*(volatile unsigned *)0x50004000)
#define rUCON1 (*(volatile unsigned *)0x50004004)
#define rUFCON1 (*(volatile unsigned *)0x50004008)
#define rUMCON1 (*(volatile unsigned *)0x5000400C)
#define rUTRSTAT1 (*(volatile unsigned *)0x50004010)
#define rUERSTAT1 (*(volatile unsigned *)0x50004014)
#define rUFSTAT1 (*(volatile unsigned *)0x50004018)
#define rUMSTAT1 (*(volatile unsigned *)0x5000401C)
#define rUBRDIV1 (*(volatile unsigned *)0x50004028)
#define rULCON2 (*(volatile unsigned *)0x50008000)
#define rUCON2 (*(volatile unsigned *)0x50008004)
#define rUFCON2 (*(volatile unsigned *)0x50008008)
#define rUTRSTAT2 (*(volatile unsigned *)0x50008010)
#define rUERSTAT2 (*(volatile unsigned *)0x50008014)
#define rUFSTAT2 (*(volatile unsigned *)0x50008018)
#define rUBRDIV2 (*(volatile unsigned *)0x50008028)
#ifdef __BIG_ENDIAN
#define rUTXH0 (*(volatile unsigned char *)0x50000023)
#define rURXH0 (*(volatile unsigned char *)0x50000027)
#define rUTXH1 (*(volatile unsigned char *)0x50004023)
#define rURXH1 (*(volatile unsigned char *)0x50004027)
#define rUTXH2 (*(volatile unsigned char *)0x50008023)
#define rURXH2 (*(volatile unsigned char *)0x50008027)
#define WrUTXH0(ch) (*(volatile unsigned char *)0x50000023)=(unsigned char)(ch)
#define RdURXH0() (*(volatile unsigned char *)0x50000027)
#define WrUTXH1(ch) (*(volatile unsigned char *)0x50004023)=(unsigned char)(ch)
#define RdURXH1() (*(volatile unsigned char *)0x50004027)
#define WrUTXH2(ch) (*(volatile unsigned char *)0x50008023)=(unsigned char)(ch)
#define RdURXH2() (*(volatile unsigned char *)0x50008027)
#define UTXH0 (0x50000020+3)
#define URXH0 (0x50000024+3)
#define UTXH1 (0x50004020+3)
#define URXH1 (0x50004024+3)
#define UTXH2 (0x50008020+3)
#define URXH2 (0x50008024+3)
#else
#define rUTXH0 (*(volatile unsigned char *)0x50000020)
#define rURXH0 (*(volatile unsigned char *)0x50000024)
#define rUTXH1 (*(volatile unsigned char *)0x50004020)
#define rURXH1 (*(volatile unsigned char *)0x50004024)
#define rUTXH2 (*(volatile unsigned char *)0x50008020)
#define rURXH2 (*(volatile unsigned char *)0x50008024)
#define WrUTXH0(ch) (*(volatile unsigned char *)0x50000020)=(unsigned char)(ch)
#define RdURXH0() (*(volatile unsigned char *)0x50000024)
#define WrUTXH1(ch) (*(volatile unsigned char *)0x50004020)=(unsigned char)(ch)
#define RdURXH1() (*(volatile unsigned char *)0x50004024)
#define WrUTXH2(ch) (*(volatile unsigned char *)0x50008020)=(unsigned char)(ch)
#define RdURXH2() (*(volatile unsigned char *)0x50008024)
#define UTXH0 (0x50000020)
#define URXH0 (0x50000024)
#define UTXH1 (0x50004020)
#define URXH1 (0x50004024)
#define UTXH2 (0x50008020)
#define URXH2 (0x50008024)
#endif

#define rTCFG0 (*(volatile unsigned *)0x51000000)
#define rTCFG1 (*(volatile unsigned *)0x51000004)
#define rTCON (*(volatile unsigned *)0x51000008)
#define rTCNTB0 (*(volatile unsigned *)0x5100000C)
#define rTCMPB0 (*(volatile unsigned *)0x51000010)
#define rTCNTO0 (*(volatile unsigned *)0x51000014)
#define rTCNTB1 (*(volatile unsigned *)0x51000018)
#define rTCMPB1 (*(volatile unsigned *)0x5100001C)
#define rTCNTO1 (*(volatile unsigned *)0x51000020)
#define rTCNTB2 (*(volatile unsigned *)0x51000024)
#define rTCMPB2 (*(volatile unsigned *)0x51000028)
#define rTCNTO2 (*(volatile unsigned *)0x5100002C)
#define rTCNTB3 (*(volatile unsigned *)0x51000030)
#define rTCMPB3 (*(volatile unsigned *)0x51000034)
#define rTCNTO3 (*(volatile unsigned *)0x51000038)
#define rTCNTB4 (*(volatile unsigned *)0x5100003C)
#define rTCNTO4 (*(volatile unsigned *)0x51000040)