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其实根本就不是MicroBlaze找不到，而是程序根本就没有编译出来！

仔细看一下编译时的输出信息：

10:12:15 **** Build of configuration Debug for project lwiptest ****make all 'Building file: ../src/echo.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/echo.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/echo.d" -MT"src/echo.o" -o "src/echo.o" "../src/echo.c"'Finished building: ../src/echo.c'' ''Building file: ../src/i2c_access.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/i2c_access.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/i2c_access.d" -MT"src/i2c_access.o" -o "src/i2c_access.o" "../src/i2c_access.c"'Finished building: ../src/i2c_access.c'' ''Building file: ../src/iic_phyreset.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/iic_phyreset.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/iic_phyreset.d" -MT"src/iic_phyreset.o" -o "src/iic_phyreset.o" "../src/iic_phyreset.c"'Finished building: ../src/iic_phyreset.c'' ''Building file: ../src/main.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/main.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/main.d" -MT"src/main.o" -o "src/main.o" "../src/main.c"'Finished building: ../src/main.c'' ''Building file: ../src/platform.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/platform.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/platform.d" -MT"src/platform.o" -o "src/platform.o" "../src/platform.c"'Finished building: ../src/platform.c'' ''Building file: ../src/platform_mb.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/platform_mb.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/platform_mb.d" -MT"src/platform_mb.o" -o "src/platform_mb.o" "../src/platform_mb.c"'Finished building: ../src/platform_mb.c'' ''Building file: ../src/platform_ppc.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/platform_ppc.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/platform_ppc.d" -MT"src/platform_ppc.o" -o "src/platform_ppc.o" "../src/platform_ppc.c"'Finished building: ../src/platform_ppc.c'' ''Building file: ../src/platform_zynq.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/platform_zynq.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/platform_zynq.d" -MT"src/platform_zynq.o" -o "src/platform_zynq.o" "../src/platform_zynq.c"'Finished building: ../src/platform_zynq.c'' ''Building file: ../src/platform_zynqmp.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/platform_zynqmp.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/platform_zynqmp.d" -MT"src/platform_zynqmp.o" -o "src/platform_zynqmp.o" "../src/platform_zynqmp.c"'Finished building: ../src/platform_zynqmp.c'' ''Building file: ../src/sfp.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/sfp.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/sfp.d" -MT"src/sfp.o" -o "src/sfp.o" "../src/sfp.c"'Finished building: ../src/sfp.c'' ''Building file: ../src/si5324.c''Invoking: MicroBlaze gcc compiler'mb-gcc -Wall -O0 -g3 -c -fmessage-length=0 -MT"src/si5324.o" -IE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bspinclude/include -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -ffunction-sections -fdata-sections -MMD -MP -MF"src/si5324.d" -MT"src/si5324.o" -o "src/si5324.o" "../src/si5324.c"'Finished building: ../src/si5324.c'' ''Building target: lwiptest.elf''Invoking: MicroBlaze gcc linker'mb-gcc -Wl,-T -Wl,../src/lscript.ld -LE:/fpga_projects/test4/ethernet_test3/ethernet_test3/export/ethernet_test3/sw/ethernet_test3/standalone_domain/bsplib/lib -mlittle-endian -mcpu=v11.0 -mxl-soft-mul -Wl,--no-relax -Wl,--gc-sections -o "lwiptest.elf"  ./src/echo.o ./src/i2c_access.o ./src/iic_phyreset.o ./src/main.o ./src/platform.o ./src/platform_mb.o ./src/platform_ppc.o ./src/platform_zynq.o ./src/platform_zynqmp.o ./src/sfp.o ./src/si5324.o   -Wl,--start-group,-lxil,-lgcc,-lc,--end-group -Wl,--start-group,-lxil,-llwip4,-lgcc,-lc,--end-groupc:/xilinx/vitis/2020.1/gnu/microblaze/nt/x86_64-oesdk-mingw32/usr/bin/microblaze-xilinx-elf/../../libexec/microblaze-xilinx-elf/gcc/microblaze-xilinx-elf/9.2.0/real-ld.exe: lwiptest.elf section `.bss' will not fit in region `microblaze_0_local_memory_ilmb_bram_if_cntlr_Mem_microblaze_0_local_memory_dlmb_bram_if_cntlr_Mem'c:/xilinx/vitis/2020.1/gnu/microblaze/nt/x86_64-oesdk-mingw32/usr/bin/microblaze-xilinx-elf/../../libexec/microblaze-xilinx-elf/gcc/microblaze-xilinx-elf/9.2.0/real-ld.exe: region `microblaze_0_local_memory_ilmb_bram_if_cntlr_Mem_microblaze_0_local_memory_dlmb_bram_if_cntlr_Mem' overflowed by 733496 bytescollect2.exe: error: ld returned 1 exit status'Finished building target: lwiptest.elf'' ''Invoking: MicroBlaze Print Size'mb-size lwiptest.elf  |tee "lwiptest.elf.size"mb-size: 'lwiptest.elf': No such file'Finished building: lwiptest.elf.size'' '10:12:17 Build Finished (took 2s.285ms)

里面有一个error，说是BRAM空间不够了，编译失败。连elf文件（程序文件）都没有生成，当然就无法运行！

把BRAM的空间改大后，编译成功了，程序就运行成功了。

程序运行成功后，如果串口没有输出，检查一下Block Design里面Uartlite波特率设置的对不对。

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