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docs/linux: use OpenSBI instead of BBL to boot linux/riscv64 QEMU VM

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OpenSBI seems to be the recommended boot method nowadays, see e.g. [1],
[2]

[1] https://riscv.org/2019/01/risc-v-community-releases-opensbi-to-foster-continued-ecosystem-growth/
[2] https://wiki.freebsd.org/riscv#OpenSBI

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
This commit is contained in:
Tobias Klauser 2020-07-01 15:38:30 +02:00 committed by Dmitry Vyukov
parent 39acb39de2
commit 695ef2ddb2
1 changed files with 12 additions and 10 deletions
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22
docs/linux/setup_linux-host_qemu-vm_riscv64-kernel.md
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@ -22,21 +22,23 @@ Also enable the [recommended Kconfig options for syzkaller](/docs/linux/kernel_c
Then build kernel with:
```
make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- -j $(nproc) vmlinux
make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- -j $(nproc)
```
# BBL (Berkeley Boot Loader)
# OpenSBI
Clone the BBL repository and build the bootable image containg bootloader and kernel:
Clone the OpenSBI repository and build the bootable OpenSBI image containg the kernel:
```shell
git clone https://github.com/riscv/riscv-pk
cd riscv-pk
mkdir build && cd build
../configure --enable-logo --host=riscv64-linux-gnu --with-payload=/path/to/linux/vmlinux
make
git clone https://github.com/riscv/opensbi
cd opensbi
make CROSS_COMPILE=riscv64-linux-gnu- PLATFORM_RISCV_XLEN=64 PLATFORM=generic FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image
```
See the OpenSBI documentation for booting on the
[QEMU RISC-V Virt Machine Platform](https://github.com/riscv/opensbi/blob/master/docs/platform/qemu_virt.md)
for more information.
# Image
We will use buildroot to create the disk image. You can obtain buildroot
@ -94,7 +96,7 @@ Run:
qemu-system-riscv64 \
-machine virt \
-nographic \
-kernel /riscv-pk/build/bbl \
-kernel /opensbi/build/platform/generic/firmware/fw_payload.elf \
-append "root=/dev/vda ro console=ttyS0" \
-object rng-random,filename=/dev/urandom,id=rng0 \
-device virtio-rng-device,rng=rng0 \
@ -135,7 +137,7 @@ Create the manager config `riscv64.cfg` similar to the following one (adjusting
"type": "qemu",
"vm": {
"count": 1,
"kernel": "/riscv-pk/build/bbl",
"kernel": "/opensbi/build/platform/generic/firmware/fw_payload.elf",
"cpu": 2,
"mem": 2048
}