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Update spike project ReadMe (#793)

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* Update README.

* Update README and fix RV64 toolchain config.
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Ming Yue 2022-02-18 00:50:40 -08:00 • committed by GitHub
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FreeRTOS/Demo/RISC-V-spike-htif_GCC/README.md
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@ -8,7 +8,7 @@
## How to build toolchain
Clone the Crosstool-NG and build.
Clone the Crosstool-NG and configure Crosstool-NG.
```
$ git clone https://github.com/crosstool-ng/crosstool-ng
@ -16,44 +16,50 @@ $ cd crosstool-ng
$ ./bootstrap
$ ./configure --enable-local
$ make
$ ./ct-ng menuconfig
```
For RV32 builds, change the following configs:
Generate toolchain configuration:
- For RV32 builds:
Create a file name as "defconfig" ( should be exactly the same, no file extension ) with the below content:
```
CT_EXPERIMENTAL=y
CT_ARCH_RISCV=y
CT_ARCH_64=n
CT_ARCH_ARCH=rv32ima
CT_ARCH_ABI=ilp32
CT_ARCH_ARCH="rv32ima"
CT_ARCH_ABI="ilp32"
CT_TARGET_CFLAGS="-mcmodel=medany"
CT_TARGET_LDFLAGS="-mcmodel=medany"
CT_MULTILIB=y
CT_DEBUG_GDB=y
```
For RV64 builds, change the following configs:
- For RV64 builds:
Create a file name as "defconfig" ( should be exactly the same, no file extension ) with the below content:
```
CT_EXPERIMENTAL=y
CT_ARCH_RISCV=y
CT_ARCH_64=y
CT_ARCH_ARCH=rv32ima
CT_ARCH_ABI=ilp32
CT_ARCH_ARCH="rv64ima"
CT_ARCH_ABI="lp64"
CT_TARGET_CFLAGS="-mcmodel=medany"
CT_TARGET_LDFLAGS="-mcmodel=medany"
CT_MULTILIB=y
CT_DEBUG_GDB=y
```
Run the below command. The configurations will be save to .config file.:
```
./ct-ng defconfig
```
Build the GNU toolchain for RISC-V.
```
$ ./ct-ng build
```
A toolchain is installed at ~/x-tools/riscv64-unknown-elf directory.
A toolchain is installed at ~/x-tools/riscv32-unknown-elf or ~/x-tools/riscv64-unknown-elf directory depends on your build.
## How to build
@ -61,7 +67,7 @@ A toolchain is installed at ~/x-tools/riscv64-unknown-elf directory.
Add path of toolchain that is described above section.
```
$ export PATH=~/x-tools/riscv64-unknown-elf/bin:$PATH
$ export PATH=~/x-tools/{YOUR_TOOLCHAIN}/bin:$PATH
```
To build, simply run `make`. If you want a debug build, pass `DEBUG=1`. If