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FreeRTOS-Kernel/FreeRTOS/Demo/RISC-V_RV32_QEMU_VIRT_GCC
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Keith Packard 56cdd1ad12 Demo/RISC-V_RV32_QEMU_VIRT_GCC: Set -march=rv32imac_zicsr 
Need to add _zicsr for more recent Risc-V toolchains which don't add
this extension to the default set anymore.

Signed-off-by: Keith Packard <keithpac@amazon.com>
2023-03-30 12:32:55 -07:00
..
build/gcc Demo/RISC-V_RV32_QEMU_VIRT_GCC: Set -march=rv32imac_zicsr 2023-03-30 12:32:55 -07:00
FreeRTOSConfig.h Demo/RISC-V_RV32_QEMU_VIRT_GCC: Enable configUSE_TRACE_FACILITY 2023-03-30 12:32:55 -07:00
main.c [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
main_blinky.c [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
main_full.c [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
ns16550.c [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
ns16550.h [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
Readme.md Update GCC RISC-V QEMU project to support new RISC-V port and vector mode (#780) 2022-02-08 13:58:34 -08:00
riscv-reg.h [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
riscv-virt.c [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
riscv-virt.h [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00
vector.S [AUTO][RELEASE]: Bump file header version to "202212.00" 2022-12-10 01:17:30 +00:00

Readme.md

Emulating generic RISC-V 32bit machine on QEMU

Requirements

  1. GNU RISC-V toolchains (tested on pre-built Sifive GNU Embedded Toolchain — v2020.12.8)
  1. qemu-riscv32-system (tested on pre-built Sifive QEMU — v2020.08.1)
  1. Linux OS (tested on Ubuntu 20.04.3 LTS)

How to build

Add path of toolchain that is described above section, such as:

$ export PATH="/YOUR_PATH/riscv64-unknown-elf/bin:${PATH}"

For release build:

$ make -C build/gcc/

For debug build:

$ make -C build/gcc/ DEBUG=1

To clean build artifacts:

$ make -C build/gcc/ clean

If the build was successful, the RTOSDemo.elf executable will be located in the build/gcc/output directory.

How to run

$ qemu-system-riscv32 -nographic -machine virt -net none \
  -chardev stdio,id=con,mux=on -serial chardev:con \
  -mon chardev=con,mode=readline -bios none \
  -smp 4 -kernel ./build/gcc/output/RTOSDemo.elf

How to debug with gdb

Append -s and -S options to the previous qemu command.

  • -s: enable to attach gdb to QEMU at port 1234
  • -S: start and halted CPU (wait for attach from gdb)

It is recommended to use the 'debug build' so that gdb can automatically map symbols. Run these commands after starting the QEMU with above options:

$ riscv64-unknown-elf-gdb -x build/gcc/gdbinit

Description

This demo just prints Tx/Rx message of queue to serial port, use no other hardware and use only primary core (currently hart 0). Other cores are simply going to wfi state and execute nothing else.