all develop tools
************************************env
ubuntu@ubuntu:~$ uname -a
Linux ubuntu 4.15.0-76-generic #86-Ubuntu SMP Fri Jan 17 17:25:58 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@ubuntu:~$ qemu-riscv64 -verion
qemu: unknown option 'verion'
ubuntu@ubuntu:~$ qemu-riscv64 -version
qemu-riscv64 version 6.1.0
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
install riscv64-unknown-elf
ls binutils-riscv64-unknown-elf_2.34-0ubuntu1_arm64.deb
binutils-riscv64-unknown-elf_2.34-0ubuntu1_arm64.deb
ls gcc-riscv64-unknown-elf_9.3.0-0ubuntu1_arm64.deb
gcc-riscv64-unknown-elf_9.3.0-0ubuntu1_arm64.deb
attention : in aarch64 lack some files including headers or *.so or *.a , but you can copy from riscv64-unknown-elf-toolchain-10.2.0-2020.12.8-x86_64-linux-ubuntu14\riscv64-unknown-elf
************************************build (1) # include_next <stdint.h> to pass -ffreestanding to your compiler.
CPPFLAGS = \
-D__riscv_float_abi_soft -ffreestanding \
riscv64-unknown-elf-gcc -E -march=rv32i -mabi=ilp32 -dM -nostdlib - < /dev/null |grep STDC_HOSTED
#define __STDC_HOSTED__ 1
dpkg --contents gcc-riscv64-unknown-elf_9.3.0-0ubuntu1_arm64.deb | grep stdint
-rw-r--r-- root/root 9457 2020-04-02 17:41 ./usr/lib/gcc/riscv64-unknown-elf/9.3.0/include/stdint-gcc.h
-rw-r--r-- root/root 328 2020-04-02 17:41 ./usr/lib/gcc/riscv64-unknown-elf/9.3.0/include/stdint.h
-rw-r--r-- root/root 3960 2020-04-02 17:41 ./usr/lib/gcc/riscv64-unknown-elf/9.3.0/plugin/include/config/newlib-stdint.h
add header
************************************link (1) problem1
/usr/lib/riscv64-unknown-elf/bin/ld: cannot find -lc
/usr/lib/riscv64-unknown-elf/bin/ld: cannot find -lgloss
collect2: error: ld returned 1 exit status
Makefile:58: recipe for target 'build/RTOSDemo.axf' failed
/usr/lib/gcc/riscv64-unknown-elf/9.3.0
add link package
(2) problem2
/usr/lib/riscv64-unknown-elf/bin/ld: /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(trunctfdf2.o): can't link double-float modules with soft-float modules
/usr/lib/riscv64-unknown-elf/bin/ld: failed to merge target specific data of file /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(trunctfdf2.o)
/usr/lib/riscv64-unknown-elf/bin/ld: /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(_clzsi2.o): can't link double-float modules with soft-float modules
/usr/lib/riscv64-unknown-elf/bin/ld: failed to merge target specific data of file /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(_clzsi2.o)
/usr/lib/riscv64-unknown-elf/bin/ld: /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(_clz.o): can't link double-float modules with soft-float modules
/usr/lib/riscv64-unknown-elf/bin/ld: failed to merge target specific data of file /usr/lib/gcc/riscv64-unknown-elf/9.3.0/rv64imafdc/lp64d/libgcc.a(_clz.o)
/usr/lib/riscv64-unknown-elf/bin/ld: build/RTOSDemo.axf(.text.prvQueueSendTask): relocation "xQueueGenericSend+0x0 (type R_RISCV_CALL)" goes out of range
/usr/lib/riscv64-unknown-elf/bin/ld: build/main_blinky.o: file class ELFCLASS32 incompatible with ELFCLASS64
/usr/lib/riscv64-unknown-elf/bin/ld: final link failed: file in wrong format
first, look riscv64-linux-gnu-gcc -v
riscv64-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=riscv64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/riscv64-linux-gnu/8/lto-wrapper
Target: riscv64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 8.4.0-1ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs --enable-languages=c,c++,go,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libsanitizer --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --disable-libphobos --enable-multiarch --disable-werror --disable-multilib --with-arch=rv64imafdc --with-abi=lp64d --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=riscv64-linux-gnu --program-prefix=riscv64-linux-gnu- --includedir=/usr/riscv64-linux-gnu/include
Thread model: posix
gcc version 8.4.0 (Ubuntu 8.4.0-1ubuntu1~18.04)
--with-arch=rv64imafdc --with-abi=lp64d
change to 64
CFLAGS = -march=rv64imafdc -mabi=lp64d -mcmodel=medany
ASFLAGS = -march=rv64imafdc -mabi=lp64d -mcmodel=medany
ls /usr/lib/gcc/riscv64-unknown-elf/9.3.0/
cc1 include libgloss.a libm_nano.a rv32ea rv32iafd rv32imfd rv64im
cc1plus include-fixed libgloss_nano.a libnosys.a rv32eac rv32if rv64i rv64imac
collect2 install-tools libg_nano.a libsemihost.a rv32em rv32ifd rv64ia rv64imafc
crt0.o libc.a liblto_plugin.la libsim.a rv32emac rv32im rv64iac rv64imafdc
crtbegin.o libc_nano.a liblto_plugin.so lto1 rv32i rv32imac rv64iaf rv64imf
crtend.o libg.a liblto_plugin.so.0 lto-wrapper rv32ia rv32imafc rv64iafd
crti.o libgcc.a liblto_plugin.so.0.0.0 plugin rv32iac rv32imafdc rv64if
crtn.o libgcov.a libm.a rv32e rv32iaf rv32imf rv64ifd
************************************make successfully
FreeRTOS-main/FreeRTOS/Demo/RISC-V-Qemu-virt_GCC# ls build/
home main_blinky.o main.o ns16550.o riscv-virt.o start.d
main_blinky.d main.d ns16550.d riscv-virt.d RTOSDemo.axf start.o
************************************run
qemu-system-riscv64 -M virt -kernel build/RTOSDemo.axf -bios none -serial stdio -display none
Hello FreeRTOS!
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1
Unexpected value received
0: Tx: Transfer2
Unexpected value received
0: Tx: Transfer1