从eboot菜单分析eboot功能实现原理.doc

作者：wogoyixikexiegliet 2008-12-10=一直在用优龙的ADS bootloader，对eboot的认识还停留在在刚来公司时候的水平，貌似我只看过eboot的startup.s，现在使用优龙的bootloader遇到很多障碍，最大缺陷就是不支持binfs以及FAT分区，这个导致了不能实现multibin，FAT的问题还可以配置注册表实现自动化分区功能，但是这样还是不理想，但是优龙的bootloader太好用了，不想放弃这块肥肉，所以决定参考eboot增加优龙bootloader的binfs以及FAT分区功能。我的一贯做法是查找关键字眼，然后从关键点入手看程序。现在就看实现eboot功能的菜单程序吧。=平台描述：2440+64M flash/SDRAM+ 5.0BSP1. 0)IPaddress:192.168.0.12 2. 1)Subnetmask:255.255.255.0 3. 2)DHCP:Disabled 4. 3)Bootdelay:5seconds 5. 4)Resettofactorydefaultconfiguration 6. 5)Startupimage:DOWNLOADNEW 7. 6)ProgramdiskimageintoSmartMediacard:Disabled 8. 7)ProgramCS8900MACaddress(11:12:22:33:44:55) 9. 8)KernelDebugger:DISABLED 10. 9)FormatBootMediaforBinFS/- 11. E)EraseReservedBlock 12. B)MarkBadBlockatReservedBlock 13. F)Low-levelformattheSmartMediacard/- 14. D)Downloadimagenow 15. L)LAUNCHexistingBootMediaimage 16. R)ReadConfiguration 17. U)DOWNLOADimagenow(USB) 18. W)WriteConfigurationRightNow 19. A)EraseAllBlocks 20.21. Enteryourselection:1. /* 2. funcBOOL|MainMenu|ManagestheSamsungbootloadermainmenu. 3. rdescTRUE=SuccessandFALSE=Failure. 4. comm 5. xref 6. */ 7.8. staticBOOLMainMenu(PBOOT_CFGpBootCfg) 9. 10. BYTEKeySelect=0; 11. BOOLbConfigChanged=FALSE; 12. BOOLEANbDownload=TRUE; 13. DWORDi; 14.15. while(TRUE) 16. 17. KeySelect=0; 18.19. EdbgOutputDebugString(/r/nEthernetBootLoaderConfiguration:/r/n/r/n); 20. EdbgOutputDebugString(0)IPaddress:%s/r/n,inet_ntoa(pBootCfg-EdbgAddr.dwIP); 21. EdbgOutputDebugString(1)Subnetmask:%s/r/n,inet_ntoa(pBootCfg-SubnetMask); 22. EdbgOutputDebugString(2)DHCP:%s/r/n,(pBootCfg-ConfigFlags&CONFIG_FLAGS_DHCP)?Enabled:Disabled); 23. EdbgOutputDebugString(3)Bootdelay:%dseconds/r/n,pBootCfg-BootDelay); 24. EdbgOutputDebugString(4)Resettofactorydefaultconfiguration/r/n); 25. EdbgOutputDebugString(5)Startupimage:%s/r/n,(g_pBootCfg-ConfigFlags&BOOT_TYPE_DIRECT)?LAUNCHEXISTING:DOWNLOADNEW); 26. EdbgOutputDebugString(6)ProgramdiskimageintoSmartMediacard:%s/r/n,(pBootCfg-ConfigFlags&TARGET_TYPE_NAND)?Enabled:Disabled); 27. EdbgOutputDebugString(7)ProgramCS8900MACaddress(%B:%B:%B:%B:%B:%B)/r/n, 28. g_pBootCfg-EdbgAddr.wMAC0&0x00FF,g_pBootCfg-EdbgAddr.wMAC08, 29. g_pBootCfg-EdbgAddr.wMAC1&0x00FF,g_pBootCfg-EdbgAddr.wMAC18, 30. g_pBootCfg-EdbgAddr.wMAC2&0x00FF,g_pBootCfg-EdbgAddr.wMAC28); 31. EdbgOutputDebugString(8)KernelDebugger:%s/r/n,(g_pBootCfg-ConfigFlags&CONFIG_FLAGS_DEBUGGER)?ENABLED:DISABLED); 32. EdbgOutputDebugString(9)FormatBootMediaforBinFS/r/n); 33.34. /N.B:weneedthisoptionheresinceBinFSisreallyaRAMimage,whereyouformatthemedia 35. /withanMBR.ThereisnowaytoparsetheimagetosayitsmenttobeBinFSenabled. 36. EdbgOutputDebugString(E)EraseReservedBlock/r/n); 37. EdbgOutputDebugString(B)MarkBadBlockatReservedBlock/r/n); 38. EdbgOutputDebugString(F)Low-levelformattheSmartMediacard/r/n); 39. EdbgOutputDebugString(D)Downloadimagenow/r/n); 40. EdbgOutputDebugString(L)LAUNCHexistingBootMediaimage/r/n); 41. EdbgOutputDebugString(R)ReadConfiguration/r/n); 42. EdbgOutputDebugString(U)DOWNLOADimagenow(USB)/r/n); 43. EdbgOutputDebugString(W)WriteConfigurationRightNow/r/n); 44. EdbgOutputDebugString(A)EraseAllBlocks/r/n); 45. EdbgOutputDebugString(/r/nEnteryourselection:); 46.47. while(!(KeySelect=0)&(KeySelectConfigFlags&=CONFIG_FLAGS_DHCP;/clearDHCPflag 69. bConfigChanged=TRUE; 70. break; 71. case1:/Changesubnetmask. 72. SetMask(pBootCfg); 73. bConfigChanged=TRUE; 74. break; 75. case2:/Togglestatic/DHCPmode. 76. pBootCfg-ConfigFlags=(pBootCfg-ConfigFlagsCONFIG_FLAGS_DHCP); 77. bConfigChanged=TRUE; 78. break; 79. case3:/Changeautobootdelay. 80. SetDelay(pBootCfg); 81. bConfigChanged=TRUE; 82. break; 83. case4:/Resetthebootloaderconfigurationtodefaults. 84. OALMSG(TRUE,(TEXT(ResettingdefaultTOC./r/n); 85. TOC_Init(DEFAULT_IMAGE_DESCRIPTOR,(IMAGE_TYPE_RAMIMAGE|IMAGE_TYPE_BINFS),0,0,0); 86. if(!TOC_Write() 87. OALMSG(OAL_WARN,(TEXT(TOC_WriteFailed!/r/n); 88. 89. OALMSG(TRUE,(TEXT(.TOCcomplete/r/n); 90. break; 91. case5:/Toggledownload/launchstatus. 92. pBootCfg-ConfigFlags=(pBootCfg-ConfigFlagsBOOT_TYPE_DIRECT); 93. bConfigChanged=TRUE; 94. break; 95. case6:/ToggleimagestoragetoSmartMedia. 96. pBootCfg-ConfigFlags=(pBootCfg-ConfigFlagsTARGET_TYPE_NAND); 97. bConfigChanged=TRUE; 98. break; 99. case7:/ConfigureCrystalCS8900MACaddress. 100. SetCS8900MACAddress(pBootCfg); 101. bConfigChanged=TRUE; 102. break; 103. case8:/ToggleKD 104. g_pBootCfg-ConfigFlags=(g_pBootCfg-ConfigFlagsCONFIG_FLAGS_DEBUGGER); 105. g_bWaitForConnect=(g_pBootCfg-ConfigFlags&CONFIG_FLAGS_DEBUGGER)?TRUE:FALSE; 106. bConfigChanged=TRUE; 107. continue; 108. break; 109. case9: 110. /formatthebootmediaforBinFS 111. /N.B:thisdoesnotdestroyourOEMreservedsections(TOC,bootloaders,etc) 112. if(!g_bBootMediaExist) 113. OALMSG(OAL_ERROR,(TEXT(ERROR:BootMonitor:bootmediadoesnotexist./r/n); 114. continue; 115. 116. /N.B:formatoffsetby#ofreservedblocks, 117. /decreasethettl#blocksavailablebythatamount. 118. if(!BP_LowLevelFormat(g_dwImageStartBlock, 119. wNUM_BLOCKS-g_dwImageStartBlock, 120. 0) 121. 122. OALMSG(OAL_ERROR,(TEXT(ERROR:BootMonitor:Low-levelbootmediaformatfailed./r/n); 123. continue; 124. 125. break; 126. caseF: 127. casef: 128. /low-levelformat 129. /N.B:thiserasesimages,BinFs,FATFS,userdata,etc. 130. /However,wedontformatBootloaders&TOCbolcks;useJTAGforthis. 131. if(!g_bBootMediaExist) 132. OALMSG(OAL_ERROR,(TEXT(ERROR:BootMonitor:bootmediadoesnotexist./r/n); 133. continue; 134. else 135. SectorInfosi; 136.137. /tokeepbootpartoffofourreservedblockswemustmarkitasbad,reserved&read-only 138. si.bOEMReserved=OEM_BLOCK_RESERVED|OEM_BLOCK_READONLY; 139. si.bBadBlock=BADBLOCKMARK; 140. si.dwReserved1=0xffffffff; 141. si.wReserved2=0xffff; 142.143. OALMSG(TRUE,(TEXT(ReservingBlocks0x%x-0x%x./r/n),0,IMAGE_START_BLOCK-1); 144. for(i=0;iIMAGE_START_SECTOR;i+) 145. FMD_WriteSector(i,NULL,&si,1); 146. 147. OALMSG(TRUE,(TEXT(.reservecomplete./r/n); 148.149. OALMSG(TRUE,(TEXT(Low-levelformatBlocks0x%x-0x%x./r/n),IMAGE_START_BLOCK,wNUM_BLOCKS-1); 150. for(i=IMAGE_START_BLOCK;iwNUM_BLOCKS;i+) 151. FMD_EraseBlock(i); 152. 153. OALMSG(TRUE,(TEXT(.erasecomplete./r/n); 154. break; 155. caseA: 156. casea: 157. OALMSG(TRUE,(TEXT(AllblockErase./r/n); 158. for(i=0;iwNUM_BLOCKS;i+) 159. FMD_EraseBlock(i); 160. 161. break; 162. caseB: 163. caseb: 164. /low-levelformat 165. /N.B:thiserasesimages,BinFs,FATFS,userdata,etc. 166. /However,wedontformatBootloaders&TOCbolcks;useJTAGforthis. 167. if(!g_bBootMediaExist) 168. OALMSG(OAL_ERROR,(TEXT(ERROR:BootMonitor:bootmediadoesnotexist./r/n); 169. continue; 170. else 171. DWORDi; 172. SectorInfosi; 173.174. /tokeepbootpartoffofourreservedblockswemustmarkitasbad,reserved&read-only 175. si.bOEMReserved=OEM_BLOCK_RESERVED|OEM_BLOCK_READONLY; 176. si.bBadBlock=BADBLOCKMARK; 177. /si.bBadBlock=0xff; 178. si.dwReserved1=0xffffffff; 179. si.wReserved2=0xffff; 180.181. OALMSG(TRUE,(TEXT(ReservingBlocks0x%x-0x%x./r/n),0,IMAGE_START_BLOCK-1); 182. for(i=0;iIMAGE_START_SECTOR;i+) 183. FMD_WriteSector(i,NULL,&si,1); 184. 185. OALMSG(TRUE,(TEXT(.reservecomplete./r/n); 186. break; 187. caseE: 188. casee: 189. /low-levelformat 190. /N.B:thiserasesimages,BinFs,FATFS,userdata,etc. 191. /However,wedontformatBootloaders&TOCbolcks;useJTAGforthis. 192. if(!g_bBootMediaExist) 193. OALMSG(OAL_ERROR,(TEXT(ERROR:BootMonitor:bootmediadoesnotexist./r/n); 194. continue; 195. else 196. inti; 197.198. OALMSG(TRUE,(TEXT(Low-levelformatBlocks0x%x-0x%x./r/n),0,IMAGE_START_BLOCK-1); 199. for(i=NBOOT_BLOCK;i(NBOOT_BLOCK+NBOOT_BLOCK_SIZE);i+) 200. FMD_EraseBlock(i); 201. 202. for(i=EBOOT_BLOCK;i 8 )/#endif/#ifndef BLOCK_TO_SECTOR#define BLOCK_TO_SECTOR(block) (block) 8 )/#endif=#define EBOOT_RAM_IMAGE_SIZE 0x00040000 /256K#define EBOOT_SECTOR_SIZE FILE_TO_SECTOR_SIZE(EBOOT_RAM_IMAGE_SIZE)#define EBOOT_BLOCK_SIZE SECTOR_TO_BLOCK(EBOOT_SECTOR_SIZE)/求出block数目，eboot.nb0占据2个block/ fs: file size in bytes/ returns sector aligned value 求出EBOOT_RAM_IMAGE_SIZE占用的flash页数_inline DWORD FILE_TO_SECTOR_SIZE(DWORD fs) return ( (fs / SECTOR_SIZE) + ( (fs % SECTOR_SIZE) ? 1 : 0) );/#define SECTOR_SIZE512从上面可以看出IMAGE_START_SECTOR=(NBOOT_BLOCK_SIZE + TOC_BLOCK_SIZE + EBOOT_BLOCK_SIZE)=1+1+2=4（block）=根据上面的准备，我现在把这个F菜单程序摘抄下来详细分析SectorInfo si; / to keep bootpart off of our reserved blocks we must mark it as bad, reserved & read-only si.bOEMReserved = OEM_BLOCK_RESERVED | OEM_BLOCK_READONLY; si.bBadBlock = BADBLOCKMARK; si.dwReserved1 = 0xffffffff; si.wReserved2 = 0xffff; OALMSG(TRUE, (TEXT(Reserving Blocks 0x%x - 0x%x ./r/n), 0, IMAGE_START_BLOCK-1);/给非FAT区域写入标志 for (i = 0; i IMAGE_START_SECTOR; i+) FMD_WriteSector(i, NULL, &si, 1); OALMSG(TRUE, (TEXT(.reserve complete./r/n); OALMSG(TRUE, (TEXT(Low-level format Blocks 0x%x - 0x%x ./r/n), IMAGE_START_BLOCK, wNUM_BLOCKS-1); for (i = IMAGE_START_BLOCK; i wNUM_BLOCKS; i+) FMD_EraseBlock(i); OALMSG(TRUE, (TEXT(.erase complete./r/n);我看了eboot的sources文件，发现 FMD_WriteSector函数居然是来自$(_TARGETPLATROOT)/Src/Common/Smartmedia/Fmd也就是说这个FMD驱动是Src/Common/Smartmedia/Fmd的代码（充分利用了代码）FMD_WriteSector(i, NULL, &si, 1)这个函数到底做了什么呢？现在就要详细看看这个函数的各个参数的作用3. BOOL FMD_WriteSector(SECTOR_ADDR startSectorAddr, LPBYTE pSectorBuff, PSectorInfo pSectorInfoBuff, DWORD dwNumSectors)： 这个函数用于写nandflash的一个扇区。对于nandflash来说，分大page和小page，大page是2048个bytes一页，小page是512个bytes一页。所以大page每个扇区有2048 bytes，小page每个扇区有512 bytes。 startSectorAddr： nandflash物理扇区的起始地址，对于nandflash来说，就是nandflash中从哪个page开始。 pSectorBuff：扇区数据buffer，从nandflash中写入的每一个扇区的数据都存放在这个buffer中。 pSectorInfoBuff：扇区信息buffer，一般每个扇区的信息会被保存在nandflash的带外数据中，针对小page，带外数据有16 bytes，大page有64 bytes。从nandflash的带外数据将该扇区的相关信息读出来，存放在这个buffer中。 dwNumSectors：读取多少个扇区，对于nandflash来说相当于读取多少个page。 再来摘抄一下慕水大哥的文章对的结构认识，其中忽略了非常重要的一块，就是用来保存其它信息的一块区域，这些信息包括块好坏的标记，块的逻辑地址，