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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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Tang-Hsun Tu

Boot Method Boot Method

　 Boot Mode

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Tang-Hsun Tu

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

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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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Tang-Hsun Tu

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)

21National Taiwan University, Graduate Institute of Networking and Multimedia

Tang-Hsun Tu