FreeRTOS-Kernel/FreeRTOS/Demo/RISC-V-Qemu-virt_GCC
Oscar Shiang 0744c28749
RISC-V-Qemu-virt: Add assert macros in FreeRTOSConfig (#777)
vAssertCalled() is already defined in main.c. We need to set the
related macros in FreeRTOSConfig header as well, or the boundary
checking through assert could not be executed
2022-01-18 11:28:57 -08:00
..
fake_rom.lds Add Makefile project for RISC-V QEMU virtpc (#266) 2020-11-11 15:35:21 -08:00
FreeRTOSConfig.h RISC-V-Qemu-virt: Add assert macros in FreeRTOSConfig (#777) 2022-01-18 11:28:57 -08:00
main.c Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
main_blinky.c Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
Makefile Add Makefile project for RISC-V QEMU virtpc (#266) 2020-11-11 15:35:21 -08:00
ns16550.c Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
ns16550.h Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
Readme.md Add Makefile project for RISC-V QEMU virtpc (#266) 2020-11-11 15:35:21 -08:00
riscv-reg.h Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
riscv-virt.c Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
riscv-virt.h Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00
start.S Apply release changes to main branch (#759) 2021-12-23 10:16:27 -08:00

Emulating generic RISC-V 32bit machine on QEMU

Requirements

  1. GNU RISC-V toolchains (tested on Crosstool-NG)
  2. qemu-riscv32-system (tested on Debian 10 package)
  3. Linux OS (tested on Debian 10)

How to build toolchain

Clone the Crosstool-NG and build.

$ git clone https://github.com/crosstool-ng/crosstool-ng
$ ./configure --enable-local
$ make

$ ./ct-ng menuconfig

Change the following configs:

CT_EXPERIMENTAL=y
CT_ARCH_RISCV=y
CT_ARCH_64=y
CT_ARCH_ARCH=rv32ima
CT_ARCH_ABI=ilp32
CT_MULTILIB=y
CT_DEBUG_GDB=y

Build the GNU toolchain for RISC-V.

$ ./ct-ng build

A toolchain is installed at ~/x-tools/riscv64-unknown-elf directory.

How to build

Add path of toolchain that is described above section.

$ export PATH=~/x-tools/riscv64-unknown-elf:$PATH

For release build:

$ make

For debug build:

$ make DEBUG=1

If success to build, executable file RTOSDemo.axf in ./build 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/RTOSDemo.axf

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)

This is just recommend to use 'debug build' for more efficient debugging. Run these commands after starting the QEMU with above options:

$ riscv64-unknown-elf-gdb build/RTOSDemo.axf

(gdb) target remote localhost:1234
(gdb) break main
Breakpoint 1 at 0x80000110

(gdb) c
Continuing.

Breakpoint 1, 0x80000110 in main ()

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.