This is release version 0.3.5 of Nuclei SDK.

!!!Caution!!!

• This version introduce a lot of new featues, and required Nuclei GNU Toolchain 2022.01
• If you want to import as NPK zip package into Nuclei Studio, 2022.01 version is required.
• If you want to have smaller code size for Nuclei RISC-V 32bit processors, please define STDCLIB=libncrt_small in your application Makefile, or change STDCLIB defined in Build/Makefile.base to make it available globally.

• Application

  • DSP_ENABLE and VECTOR_ENABLE are deprecated now in demo_dsp application, please use ARCH_EXT to replace it. ARCH_EXT=p equal to DSP_ENABLE=ON, ARCH_EXT=v equal to VECTOR_ENABLE=ON.

  • demo_dsp application no need to set include and libraries for NMSIS DSP library, just use NMSIS_LIB = nmsis_dsp to select NMSIS DSP library and set include directory.

  • Update coremark compile options for different Nuclei cpu series, currently 900 series options and 200/300/600 series options are provided, and can be selected by CPU_SERIES.

    • CPU_SERIES=900: the compiler options for Nuclei 900 series will be selected.
    • otherwise, the compiler options for Nuclei 200/300/600 series will be selected, which is by default for 300

  • Fix whetstone application compiling issue when compiled with v extension present

• SoC

  • Provide better Nuclei Studio NPK Feature, required Nuclei Studio 2022.01 version.
  • Provide correct gd32vf103.svd, the previous one content is messed up.
  • putchar/getchar newlib stub are required to be implemented for RT-Thread porting
  • Added support for newly introduced nuclei c runtime library(libncrt).
  • Rearrange stub function folder for gd32vf103 and demosoc to support different c runtime library.
  • A lot changes happened in link scripts under SoC folder
    • heap section is added for libncrt, size controlled by __HEAP_SIZE
    • heap start and end ld symbols are __heap_start and __heap_end
    • stub function sbrk now using new heap start and end ld symbols
    • tdata/tbss section is added for for libncrt, thread local storage supported
  • For flash download mode, vector table are now placed in .vtable section now instead of .vtable_ilm, VECTOR_TABLE_REMAPPED macro is still required in DOWNLOAD=flash mode
  • flash program algo used in openocd for demosoc changed to nuspi, see changes in openocd_demosoc.cfg

• NMSIS

  • Update NMSIS Core/DSP/NN to version 1.0.3, see NMSIS 1.0.3 Changelog
  • Update prebuilt NMSIS DSP/NN library to version 1.0.3 built by risc-v gcc 10.2
  • For NMSIS Core 1.0.3, no need to define __RISCV_FEATURE_DSP and __RISCV_FEATURE_VECTOR for riscv_math.h now, it is now auto-defined in riscv_math_types.h

• OS

  • Change RT-Thread porting to support libncrt and newlibc, mainly using putchar and getchar

• Build System

  • Introduce STDCLIB makefile variable to support different c library.
  • NEWLIB and PFLOAT variable is deprecated in this release.
  • Introduce ARCH_EXT makefile variable to support b/p/v extension.
  • Only link -lstdc++ library when using STDCLIB=newlib_xxx
  • RISCV_CMODEL variable is added to choose code model, medlow or medany can be chosen, default is medlow for RV32 otherwise medany for RV64.
  • RISCV_TUNE variable is added to select riscv tune model, for Nuclei CPU, we added nuclei-200-series, nuclei-300-series, nuclei-600-series and nuclei-900-series in Nuclei RISC-V GNU toolchain >= 2021.12

• Contribution

  • Update contribution guide due to runtime library choices provided now.

• NPK

  • newlibsel configuration variable changed to stdclib, and is not compatiable.

    • newlibsel=normal change to stdclib=newlib_full
    • newlibsel=nano_with_printfloat changed to stdclib=newlib_small
    • newlibsel=nano changed to stdclib=newlib_nano
    • stdclib has more options, please see SoC/demosoc/Common/npk.yml
    • nuclei_archext is added as new configuration variable, see SoC/demosoc/Common/npk.yml

• tools

  • generate benchmark values in csv files when running nsdk_bench.py or nsdk_execute.py
  • fix xl_spike processes not really killed in linux environment when running nsdk_bench.py

For detailed changes, please check commit histories since 0.3.4 release.