2440 bootloader中，MBR是什么东西？

fengyeshu

2440 bootloader中，MBR是什么东西？ [复制链接]

请教，bootloader中有这么一个函数：

1. // lqm: 1G08:dwStartSector = 7 * 64 (boot:7个block)
   
2. HANDLE BP_OpenPartition(DWORD dwStartSector, DWORD dwNumSectors, DWORD dwPartType, BOOL fActive, DWORD dwCreationFlags)
   
3. {
   
4.         DWORD dwPartIndex;
   
5.         BOOL fExists;
   
6. 
   
7.         ASSERT (g_pbMBRSector);
   
8.         
   
9.         if (!IsValidMBR()) // 这里的目的是什么???
   
10.                 {
    
11.             DWORD dwFlags = 0;
    
12. 
    
13.             if (dwCreationFlags == PART_OPEN_EXISTING)
    
14.                         {
    
15.                 RETAILMSG(1, (TEXT("OpenPartition: Invalid MBR.  Cannot open existing partition 0x%x.\r\n"), dwPartType));
    
16.                 return INVALID_HANDLE_VALUE;
    
17.             }
    
18.             
    
19.             RETAILMSG(1, (TEXT("OpenPartition: Invalid MBR.  Formatting flash.\r\n")));
    
20.             if (g_FlashInfo.flashType == NOR)
    
21.                         {
    
22.                 dwFlags |= FORMAT_SKIP_BLOCK_CHECK;
    
23.             }
    
24.             BP_LowLevelFormat (0, g_FlashInfo.dwNumBlocks, dwFlags);
    
25.             dwPartIndex = 0;
    
26.             fExists = FALSE;
    
27.         }
    
28.         else
    
29.                 {
    
30.             fExists = GetPartitionTableIndex(dwPartType, fActive, &dwPartIndex);        
    
31.         }
    
32. 
    
33.         RETAILMSG(1, (TEXT("OpenPartition: Partition Exists=0x%x for part 0x%x.\r\n"), fExists, dwPartType));
    
34.         if (fExists) {
    
35. 
    
36.             // Partition was found.  
    
37.             if (dwCreationFlags == PART_CREATE_NEW)
    
38.                 return INVALID_HANDLE_VALUE;
    
39.             
    
40.             if (g_partStateTable[dwPartIndex].pPartEntry == NULL) {
    
41.                 // Open partition.  If this is the boot section partition, then file pointer starts after MBR
    
42.                 g_partStateTable[dwPartIndex].pPartEntry = (PPARTENTRY)(g_pbMBRSector + PARTTABLE_OFFSET + sizeof(PARTENTRY)*dwPartIndex);
    
43.                 g_partStateTable[dwPartIndex].dwDataPointer = 0;
    
44.             }            
    
45.             return (HANDLE)&g_partStateTable[dwPartIndex];            
    
46.         }
    
47.         else {
    
48. 
    
49.             // If there are already 4 partitions, or creation flag specified OPEN_EXISTING, fail.
    
50.             if ((dwPartIndex == NUM_PARTS) || (dwCreationFlags == PART_OPEN_EXISTING))
    
51.                 return INVALID_HANDLE_VALUE;
    
52. 
    
53.             // Create new partition
    
54.             return CreatePartition (dwStartSector, dwNumSectors, dwPartType, fActive, dwPartIndex);
    
55.         }
    
56. 
    
57.         return INVALID_HANDLE_VALUE;
    
58.         
    
59. }

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IsValidMBR() 函数的代码如下：

1. static BOOL IsValidMBR()
   
2. {
   
3.     // Check to see if the MBR is valid
   
4. 
   
5.     // MBR block is always located at logical sector 0
   
6.     g_dwMBRSectorNum = GetMBRSectorNum();        
   
7. 
   
8.     RETAILMSG (1, (TEXT("IsValidMBR: MBR sector = 0x%x\r\n"), g_dwMBRSectorNum));
   
9.    
   
10.     if ((g_dwMBRSectorNum == INVALID_ADDR) || !FMD_ReadSector (g_dwMBRSectorNum, g_pbMBRSector, NULL, 1))
    
11.         {
    
12.         return FALSE;  
    
13.     }
    
14.         // lqm added for test.10-04-12
    
15.         RETAILMSG (1, (TEXT("g_pbMBRSector[0] = 0x%x\r\n"), g_pbMBRSector[0]));
    
16.         RETAILMSG (1, (TEXT("g_pbMBRSector[1] = 0x%x\r\n"), g_pbMBRSector[1]));
    
17.         RETAILMSG (1, (TEXT("g_pbMBRSector[2] = 0x%x\r\n"), g_pbMBRSector[2]));
    
18.         RETAILMSG (1, (TEXT("g_pbMBRSector[SECTOR_SIZE-2] = 0x%x\r\n"), g_pbMBRSector[SECTOR_SIZE-2]));
    
19.         RETAILMSG (1, (TEXT("g_pbMBRSector[SECTOR_SIZE-1] = 0x%x\r\n"), g_pbMBRSector[SECTOR_SIZE-1]));
    
20.         // end added.
    
21.     return ((g_pbMBRSector[0] == 0xE9) &&
    
22.          (g_pbMBRSector[1] == 0xfd) &&
    
23.          (g_pbMBRSector[2] == 0xff) &&
    
24.          (g_pbMBRSector[SECTOR_SIZE-2] == 0x55) &&
    
25.          (g_pbMBRSector[SECTOR_SIZE-1] == 0xAA));
    
26. }

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打印信息中提示：g_dwMBRSectorNum ＝ 0.
请问，这个MBR到底是个什么东西？存放在block0的第0个page吗？
我在FL2440开发板上，上面打印信息，读出来的g_pbMBRSector与后面的完全符合，
开发板的flash是K9F1G08的，另外一块板是用的K9F1208，更改bootloader相关代码后，这里打印的信息，
g_pbMBRSector[0] = 0x0
g_pbMBRSector[1] = 0x0
g_pbMBRSector[2] = 0x0
g_pbMBRSector[SECTOR_SIZE-2] = 0x0
g_pbMBRSector[SECTOR_SIZE-1] = 0x0
为什么这些会是0？错在哪里？
从程序分析，上面两个板的MBR都是放在block0的第0页？？？？？

juanchen

建议楼主 好好看看这篇 文章：
http://blog.eeworld.net/hugohong/archive/2009/05/20/4204700.aspx

ljl918918

太感谢kyzf了，我好好看看，好文章

easybyte

MBR是建立磁盘分区的

youngboy

相当于文件的头文件

kuangql

学习。。。。

yuzhibing

看了上面的文章，大受启发，我将MBR放到了block13，这时能进系统了，但是仍然卡在flash驱动那里，打印信息如下：

1. Microsoft Windows CE Ethernet Bootloader Common Library Version 1.1 Built Apr 12 2010 09:47:46
   
2. Microsoft Windows CE Bootloader for the Samsung SMDK2440 Version 2.4 Built Apr 13 2010
   
3. 
   
4. FMD: ReadID (Mfg=ec, Dev=76)
   
5. FMD_Init: finished successful
   
6. FMD_Init: reserved_blocks 0
   
7. FMD_GetInfo
   
8. Press [ENTER] to launch image stored on boot media, or [SPACE] to enter boot monitor.
   
9. 
   
10. Initiating image launch in 5 seconds.
    
11. Ethernet Boot Loader Configuration:
    
12. 
    
13. 0) IP address: 192.168.1.115
    
14. 1) Subnet mask: 255.255.255.0
    
15. 2) DHCP: Disabled
    
16. 3) Boot delay: 5 seconds
    
17. 4) Reset to factory default configuration
    
18. 5) Startup image: LAUNCH EXISTING
    
19. 6) Program disk image into SmartMedia card: Enabled
    
20. 7) Program CS8900 MAC address (00:11:22:33:44:55)
    
21. 8) Kernel Debugger: DISABLED
    
22. 9) Format Boot Media for BinFS
    
23. F) Low-level format the Smart Media card
    
24. D) Download image now
    
25. L) LAUNCH existing Boot Media image
    
26. U) DOWNLOAD image now(USB)
    
27. R) Read Configuration
    
28. W) Write Configuration Right Now
    
29. 
    
30. Enter your selection: u
    
31. System ready!
    
32. Preparing for download...
    
33. Please send the Image through USB.
    
34. pUSBCtrlAddr->OCSR1.out_pkt_rdy = 0x1
    
35. Ep3Handler : downPtIndex = 0x30800040
    
36. 
    
37. Download BIN file information:
    
38. -----------------------------------------------------
    
39. [0]: Base Address=0x80200000  Length=0x22620b4
    
40. -----------------------------------------------------
    
41. ROMHDR at Address 80200044h
    
42. Writing single region/multi-region update, dwBINFSPartLength: 36053172
    
43. IsValidMBR: MBR sector = 0x1a0
    
44. g_pbMBRSector[0] = 0xff
    
45. g_pbMBRSector[1] = 0xff
    
46. g_pbMBRSector[2] = 0xff
    
47. g_pbMBRSector[SECTOR_SIZE-2] = 0xff
    
48. g_pbMBRSector[SECTOR_SIZE-1] = 0xff
    
49. OpenPartition: Invalid MBR.  Formatting flash.
    
50. Enter LowLevelFormat [0xd, 0xfff].
    
51. Erasing flash block(s) [0xd, 0xfff] (please wait): IsBlockBad(43A): TRUE
    
52. EraseBlocks: found a bad block (0x43a) - skipping...
    
53. Done.
    
54. WriteMBR: MBR block = 0xd.
    
55. Done.
    
56. 
    
57. OpenPartition: Partition Exists=0x0 for part 0x21.
    
58. CreatePartition: Enter CreatePartition for 0x21.
    
59. IsBlockBad(43A): TRUE
    
60. LastLogSector: Last log sector is: 0x1fe3f.
    
61. CreatePartition: Start = 0x1c0, Num = 0x11320.
    
62. Log2Phys: Logical 0x1c0 -> Physical 0x360
    
63. IsBlockBad(43A): TRUE
    
64. WriteMBR: MBR block = 0xd.
    
65. BP_SetDataPointer at 0x0
    
66. WriteData: Start = 0x0, Length = 0x22620b4.
    
67. Log2Phys: Logical 0x1c0 -> Physical 0x360
    
68. IsBlockBad(43A): TRUE
    
69. Updateded TOC!
    
70. IsValidMBR: MBR sector = 0x1a0
    
71. g_pbMBRSector[0] = 0xe9
    
72. g_pbMBRSector[1] = 0xfd
    
73. g_pbMBRSector[2] = 0xff
    
74. g_pbMBRSector[SECTOR_SIZE-2] = 0x55
    
75. g_pbMBRSector[SECTOR_SIZE-1] = 0xaa
    
76. OpenPartition: Partition Exists=0x0 for part 0xb.
    
77. CreatePartition: Enter CreatePartition for 0xb.
    
78. FindFreeSector: FreeSector is: 0x114e0 after processing part 0x21.
    
79. CreatePartition: Num sectors set to 0xe820 to allow for compaction blocks.
    
80. CreatePartition: Start = 0x114e0, Num = 0xe820.
    
81. WriteMBR: MBR block = 0xd.
    
82. TOC {
    
83. dwSignature: 0x434F544E
    
84. BootCfg {
    
85.   ConfigFlags: 0x830
    
86.   BootDelay: 0x5
    
87.   ImageIndex: 1
    
88.   IP: 192.168.1.115
    
89.   MAC Address: 00:11:22:33:44:55
    
90.   Port: 0.0.0.0
    
91.   SubnetMask: 255.255.255.0
    
92. }
    
93. ID[0] {
    
94.   dwVersion: 0x20004
    
95.   dwSignature: 0x45424F54
    
96.   String: 'eboot.nb0'
    
97.   dwImageType: 0x2
    
98.   dwTtlSectors: 0x200
    
99.   dwLoadAddress: 0x80038000
    
100.   dwJumpAddress: 0x80038000
     
101.   dwStoreOffset: 0x0
     
102.   sgList[0].dwSector: 0xA0
     
103.   sgList[0].dwLength: 0x200
     
104. }
     
105. ID[1] {
     
106.   dwVersion: 0x1
     
107.   dwSignature: 0x43465348
     
108.   String: ''
     
109.   dwImageType: 0x2
     
110.   dwTtlSectors: 0x11311
     
111.   dwLoadAddress: 0x80200000
     
112.   dwJumpAddress: 0x8022C480
     
113.   dwStoreOffset: 0x0
     
114.   sgList[0].dwSector: 0x360
     
115.   sgList[0].dwLength: 0x11311
     
116. }
     
117. chainInfo.dwLoadAddress: 0X00000000
     
118. chainInfo.dwFlashAddress: 0X00000000
     
119. chainInfo.dwLength: 0X00000000
     
120. }
     
121. waitforconnect
     
122. INFO: OEMLaunch: Jumping to Physical Address 0x3022C480h (Virtual Address 0x8022C480h)...
     
123. 
     
124. 
     
125. Windows CE Kernel for ARM (Thumb Enabled) Built on Aug  4 2008 at 18:38:38
     
126. ProcessorType=0920  Revision=0
     
127. sp_abt=ffff5000 sp_irq=ffff2800 sp_undef=ffffc800 OEMAddressTable = 8022c354
     
128. DCache: 8 sets, 64 ways, 32 line size, 16384 size
     
129. ICache: 8 sets, 64 ways, 32 line size, 16384 size
     
130. Sp=ffffc7cc
     
131. OEMIoControl: Unsupported Code 0x10100b4 - device 0x0101 func 45
     
132. OEMIoControl: Unsupported Code 0x101008c - device 0x0101 func 35
     
133. FMD: ReadID (Mfg=ec, Dev=76)
     
134. FMD_Init: finished successful
     
135. FMD_Init: reserved_blocks 0
     
136. FMD_GetInfo
     
137. IsBlockBad(4): TRUE
     
138. IsBlockBad(43A): TRUE
     
139. OEMIoControl: Unsupported Code 0x1010104 - device 0x0101 func 65

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正在查原因，不知何解？

lovetree

BP开头的这些函数正在研究中...MARK!

cs_0104

你的FMD_OEMIoControl函数中应该没有对不支持的操作码进行处理，可在switch(dwIoControlCode)后加default处理。

ray23

引用 8 楼 jimigaga 的回复:
你的FMD_OEMIoControl函数中应该没有对不支持的操作码进行处理，可在switch(dwIoControlCode)后加default处理。

呵呵~学习了~MARK

neckfully

文件系统相关的东西，这里是创建 fat分区的。

wt1121

系统已经起来了，但是显示一片空白，不知是显存地址冲突还是什么原因，打印信息如下：

1. Microsoft Windows CE Ethernet Bootloader Common Library Version 1.1 Built Apr 12 2010 09:47:46
   
2. Microsoft Windows CE Bootloader for the Samsung SMDK2440 Version 2.4 Built Apr 14 2010
   
3. 
   
4. FMD: ReadID (Mfg=ec, Dev=76)
   
5. FMD_Init: finished successful
   
6. FMD_Init: reserved_blocks 104
   
7. FMD_GetInfo
   
8. Press [ENTER] to launch image stored on boot media, or [SPACE] to enter boot monitor.
   
9. 
   
10. Initiating image launch in 5 seconds.
    
11. Ethernet Boot Loader Configuration:
    
12. 
    
13. 0) IP address: 192.168.1.115
    
14. 1) Subnet mask: 255.255.255.0
    
15. 2) DHCP: Disabled
    
16. 3) Boot delay: 5 seconds
    
17. 4) Reset to factory default configuration
    
18. 5) Startup image: LAUNCH EXISTING
    
19. 6) Program disk image into SmartMedia card: Enabled
    
20. 7) Program CS8900 MAC address (00:11:22:33:44:55)
    
21. 8) Kernel Debugger: DISABLED
    
22. 9) Format Boot Media for BinFS
    
23. F) Low-level format the Smart Media card
    
24. D) Download image now
    
25. L) LAUNCH existing Boot Media image
    
26. U) DOWNLOAD image now(USB)
    
27. R) Read Configuration
    
28. W) Write Configuration Right Now
    
29. 
    
30. Enter your selection: u
    
31. System ready!
    
32. Preparing for download...
    
33. Please send the Image through USB.
    
34. pUSBCtrlAddr->OCSR1.out_pkt_rdy = 0x1
    
35. Ep3Handler : downPtIndex = 0x30800040
    
36. 
    
37. Download BIN file information:
    
38. -----------------------------------------------------
    
39. [0]: Base Address=0x80200000  Length=0x22620b0
    
40. -----------------------------------------------------
    
41. ROMHDR at Address 80200044h
    
42. Writing single region/multi-region update, dwBINFSPartLength: 36053168
    
43. IsValidMBR: MBR sector = 0x1a0
    
44. g_pbMBRSector[0] = 0xe9
    
45. g_pbMBRSector[1] = 0xfd
    
46. g_pbMBRSector[2] = 0xff
    
47. g_pbMBRSector[SECTOR_SIZE-2] = 0x55
    
48. g_pbMBRSector[SECTOR_SIZE-1] = 0xaa
    
49. OpenPartition: Partition Exists=0x1 for part 0x21.
    
50. BP_SetDataPointer at 0x0
    
51. WriteData: Start = 0x0, Length = 0x22620b0.
    
52. Log2Phys: Logical 0x1c0 -> Physical 0x360
    
53. IsBlockBad(43A): TRUE
    
54. Updateded TOC!
    
55. IsValidMBR: MBR sector = 0x1a0
    
56. g_pbMBRSector[0] = 0xe9
    
57. g_pbMBRSector[1] = 0xfd
    
58. g_pbMBRSector[2] = 0xff
    
59. g_pbMBRSector[SECTOR_SIZE-2] = 0x55
    
60. g_pbMBRSector[SECTOR_SIZE-1] = 0xaa
    
61. OpenPartition: Partition Exists=0x1 for part 0xb.
    
62. TOC {
    
63. dwSignature: 0x434F544E
    
64. BootCfg {
    
65.   ConfigFlags: 0x830
    
66.   BootDelay: 0x5
    
67.   ImageIndex: 1
    
68.   IP: 192.168.1.115
    
69.   MAC Address: 00:11:22:33:44:55
    
70.   Port: 0.0.0.0
    
71.   SubnetMask: 255.255.255.0
    
72. }
    
73. ID[0] {
    
74.   dwVersion: 0x20004
    
75.   dwSignature: 0x45424F54
    
76.   String: 'eboot.nb0'
    
77.   dwImageType: 0x2
    
78.   dwTtlSectors: 0x200
    
79.   dwLoadAddress: 0x80038000
    
80.   dwJumpAddress: 0x80038000
    
81.   dwStoreOffset: 0x0
    
82.   sgList[0].dwSector: 0xA0
    
83.   sgList[0].dwLength: 0x200
    
84. }
    
85. ID[1] {
    
86.   dwVersion: 0x1
    
87.   dwSignature: 0x43465348
    
88.   String: ''
    
89.   dwImageType: 0x2
    
90.   dwTtlSectors: 0x11311
    
91.   dwLoadAddress: 0x80200000
    
92.   dwJumpAddress: 0x8022C480
    
93.   dwStoreOffset: 0x0
    
94.   sgList[0].dwSector: 0x360
    
95.   sgList[0].dwLength: 0x11311
    
96. }
    
97. chainInfo.dwLoadAddress: 0X00000000
    
98. chainInfo.dwFlashAddress: 0X00000000
    
99. chainInfo.dwLength: 0X00000000
    
100. }
     
101. waitforconnect
     
102. INFO: OEMLaunch: Jumping to Physical Address 0x3022C480h (Virtual Address 0x8022C480h)...
     
103. 
     
104. 
     
105. Windows CE Kernel for ARM (Thumb Enabled) Built on Aug  4 2008 at 18:38:38
     
106. ProcessorType=0920  Revision=0
     
107. sp_abt=ffff5000 sp_irq=ffff2800 sp_undef=ffffc800 OEMAddressTable = 8022c354
     
108. DCache: 8 sets, 64 ways, 32 line size, 16384 size
     
109. ICache: 8 sets, 64 ways, 32 line size, 16384 size
     
110. Sp=ffffc7cc
     
111. OEMIoControl: Unsupported Code 0x10100b4 - device 0x0101 func 45
     
112. OEMIoControl: Unsupported Code 0x101008c - device 0x0101 func 35
     
113. FMD: ReadID (Mfg=ec, Dev=76)
     
114. FMD_Init: finished successful
     
115. FMD_Init: reserved_blocks 104
     
116. FMD_GetInfo
     
117. IsBlockBad(6C): TRUE
     
118. IsBlockBad(43A): TRUE
     
119. OEMIoControl: Unsupported Code 0x1010104 - device 0x0101 func 65
     
120. OEMIoControl: Unsupported Code 0x10100c4 - device 0x0101 func 49
     
121. OEMIoControl: Unsupported Code 0x10100c4 - device 0x0101 func 49
     
122. OEMIoControl: Unsupported Code 0x10100d0 - device 0x0101 func 52
     
123. OEMIoControl: Unsupported Code 0x10100f8 - device 0x0101 func 62
     
124. +CS8900:DriverEntry
     
125. CS8900:CSInit failure!!
     
126. 
     
127. dm9000 init.
     
128. [dm9]: Chip signature is 0000291E
     
129. INFO: CReg2440Uart::CReg2440Uart using processor frequency reported by the OAL (50000000).
     
130. I2C Init
     
131. IIC IRQ mapping: [IRQ:27->sysIRQ:19].
     
132. Key: DLL_PROCESS_ATTACH.
     
133. [Pwrbtn2440.c] EINT_InitializeAddresses Success
     
134. [Pwrbtn2440.c] KEY_Init Sucessfully!
     
135. [Pwrbtn2440.c] Wait EINT4...
     
136. INFO: WAVEDEV.DLL: SetI2SClockRate:  Using processor frequency reported by the OAL (50000000).
     
137. Prescaler:2
     
138. [Bak_hw.cpp] BL_InitializeAddresses - Success
     
139. BL_ON  progress bar thread closed!
     
140. ++S3C2440DISP::S3C2440DISP
     
141. [s3c2440disp.cpp] rGPCCON = 0xaaaaaaaa
     
142. [s3c2440disp.cpp] LCDCON1 = 0x6300179
     
143. [s3c2440disp.cpp] LCDCON2 = 0x1577c043
     
144. [s3c2440disp.cpp] LCDCON3 = 0x2c31f28
     
145. [s3c2440disp.cpp] LCDCON4 = 0xd80
     
146. [s3c2440disp.cpp] LCDCON5 = 0x14b09
     
147. --S3C2440DISP::InitDisplay done
     
148. DISPLAY:800*480
     
149. OEMIoControl: Unsupported Code 0x10100fc - device 0x0101 func 63
     
150. BL_OFF  

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二楼那篇文章很牛，按照那文章，系统已经正常运行。