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FreeRTOS-Kernel/FreeRTOS/Demo/RISC-V-Qemu-virt_GCC
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e14002270 cee9d5c560
Fix qemu riscv build error and miss debug info in assembly code (#838) 
1. add INCLUDE_xTaskGetCurrentTaskHandle for stream_buffer use
2. LDFLAGS add arch and abi info for linker
        for riscv64-unknown-elf multilib, if there is no arch and abi
        info, will link to default lib and have below error
        target emulation `elf32-littleriscv' does not match `elf64-littleriscv'
3. use CFLAGS to replace ASFLAGS when compile assembly code
        because DEBUG flag is added in CFLAGS, if we use ASFLAGS to compile
        assembly code, there is no debug info in assembly code objfile

Signed-off-by: Eric Chan <e14002270@gmail.com>
2022-08-10 15:04:36 +05:30
..
fake_rom.lds Add Makefile project for RISC-V QEMU virtpc (#266) 2020-11-11 15:35:21 -08:00
FreeRTOSConfig.h Fix qemu riscv build error and miss debug info in assembly code (#838) 2022-08-10 15:04:36 +05:30
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 Fix qemu riscv build error and miss debug info in assembly code (#838) 2022-08-10 15:04:36 +05:30
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 Extend qemu virt riscv demo (#774) 2022-01-26 17:55:06 -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

Readme.md

There is an updated version of this original submission from Katsuhiro Suzuki in the FreeRTOS/Demo/RISC-V_RV32_QEMU_VIRT_GCC directory.

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.