1 dual-os project national taiwan university, graduate institute of networking and multimedia...
TRANSCRIPT
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Dual-OS Project Dual-OS Project
National Taiwan University, Graduate Institute of Networking and MultimediaTang-Hsun Tu
Presenter: Tang-Hsun Tu
Second Stage LoaderSecond Stage Loader─ for BF561─ for BF561
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◇ Multi-DXE Loader
Outlines Outlines
○ Boot Method
◇ Loader Format
○ Loader
○ Environment
National Taiwan University, Graduate Institute of Networking and MultimediaTang-Hsun Tu
○ Conclusion
○ Further Work
◇ Second Stage Loader
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Tang-Hsun Tu
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Boot Method Boot Method
Boot Mode
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1. *.doj , 由 Visual DSP++ 編譯 *.s, *.c 產生的 object 檔案
2. *.dxe , 由 Linker 連結產生執行檔
3. *.ldr , 透過 Loader 轉換 dxe 成 ldr
4. *.bin, 由 Blackfin 提供的 cross-compiler 編譯出的二元檔
5. *.hex , 由 Blackfin 提供的轉換程式轉換成 bf561 可 load檔案
File Format
Boot Method Boot Method
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Tang-Hsun Tu
Compiler / Linker / Loader
Boot Method Boot Method
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Tang-Hsun Tu
Loader and Flash
Boot Method Boot Method
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Tang-Hsun Tu
Loader File Loader File
Loader File (*.ldr)
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Tang-Hsun Tu
1. Address(4 bytes) – the block will be booted within mem
2. Count(4 bytes) – number of bytes in the block
3. Flag(2 bytes) – block type and control commands
Loader File Loader File
10-byte Header File
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Loader File Loader File
Example
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Tang-Hsun Tu
Loader File Loader File
Mult-DXE Loader
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Tang-Hsun Tu
BF561 4-byte Global header
Loader File Loader File
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Tang-Hsun Tu
Loader File Loader File
BF561 Mult-DXE Loader
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Tang-Hsun Tu
Second Stage Loader Second Stage Loader
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Tang-Hsun Tu
Second Stage Loader Second Stage Loader
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Tang-Hsun Tu
Second Stage Loader Second Stage Loader
section ("l2_shared") EX_INTERRUPT_HANDLER(A_ISR){ if(*pFIO0_FLAG_C & 0x0020) //SW 5 is pressed { //(0-> indicates load executable, 1-> DXE number) SECOND_STAGE_LOADER(0, 1); SECOND_STAGE_LOADER(1, 0);//(1-> execute the DXE) } else if(*pFIO0_FLAG_C & 0x0040) //SW 6 is pressed { //load the 2nd DXE in the boot stream SECOND_STAGE_LOADER(0, 2); SECOND_STAGE_LOADER(1, 0);//execute the 2nd DXE }} // end
Example
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Work Work
National Taiwan University, Graduate Institute of Networking and MultimediaTang-Hsun Tu
分工情況
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Conclusion Conclusion
National Taiwan University, Graduate Institute of Networking and MultimediaTang-Hsun Tu
1. We can use the ldr file for booting from flash
2. To load two executables, SSL must be incorporated.
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Further Work Further Work
National Taiwan University, Graduate Institute of Networking and MultimediaTang-Hsun Tu
1. Convert u-boot format(*.bin) to *.dxe format
2. Use SSL to manage two u-boots (one is for coreA and the other is for coreB)
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