版本 40348004613ddbecc40482d4a2b4ea010a4503d3
Changes from 40348004613ddbecc40482d4a2b4ea010a4503d3 to 5603177eea7fc8a833cdf701d2d6a0d0430e78a1
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title: Lab36: ELF
toc: no
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預期目標
-------------
* 在 `STM32F429i Discovery</embedded/STM32F429>`_ 開發簡易 ELF loader
* 學習 OpenOCD 和 gdb
預先準備
------------
* 確認 $PATH 可找到 `Lab 35</embedded/Lab35>`_ 設定的 GNU Toolchain
- ``arm-none-eabi-gcc -v`` 預期輸出 ``4.8.3-11ubuntu1`` 一類包含 ubuntu 的字串
- 若否，請重新設定 PATH 環境變數
* 確認 `STM32F429i Discovery</embedded/STM32F429>`_ 板子已經由 USB 線接上裝有 GNU/Linux 的開發環境，並確保 `Lab 35</embedded/Lab35>`_ 所提及的工具均已正確安裝，如 openocd 與 gdb
$ make oocd
參考執行結果:
.. code-block:: prettyprint
make[1]: Entering directory 'elfloader/app'
CLEAN
CC main.c
CC start.c
LINK app.elf
text data bss dec hex filename
164 8 4 176 b0 app.elf
Creating list...
make[1]: Leaving directory 'elfloader/app'
Launch OpenOCD for stm32f4discovery
Open On-Chip Debugger 0.9.0-dev-00105-ge1bc7f4 (2014-08-08-20:38)
...
ELF: Scan ELF indexs...
ELF: Examining section 1 .text
ELF: Examining section 2 .rel.text
ELF: Examining section 3 .rodata
...
ELF: Examining section 11 .symtab
ELF: Examining section 12 .strtab
ELF: Done
ELF: Relocating section .text
ELF: Offset Info Type Name
ELF: 00000034 00001202 R_ARM_ABS32 i
...
ELF: Relocating section .rodata
ELF: Offset Info Type Name
ELF: 00000038 00001502 R_ARM_ABS32 banner
...
ELF: symAddr=20000F48 relAddr=20000F8C
ELF: R_ARM_ABS32 relocated is 0x20000F54
Hello world on Oct 30 2014 at 17:28:11 (0)
...
Done
semihosting: *** application exited ***
預期目標
------------
* 在 `STM32F429i Discovery</embedded/STM32F429>`_ 開發簡易 ELF loader
* 學習 OpenOCD 和 gdb
參考資訊
------------
* `BeagleBoard OpenOCD<http://elinux.org/BeagleBoardOpenOCD>`_
* `GDB and OpenOCD<http://openocd.sourceforge.net/doc/html/GDB-and-OpenOCD.html>`_
