The unauthenticated git protocol on port 9418 is no longer supported

[Pascal Cotret]

$ git clone https://github.com/freechipsproject/rocket-tools
$ cd rocket-tools
$ git submodule update --init --recursive

Got me into the error described in the title.
In other words, recursive clone of the RISC-V GNU toolchain can't work since March 15:
https://github.com/riscv-collab/riscv-gnu-toolchain/blob/64879b24e18572a3d67aa4268477946ddb248006/.gitmodules#L18
git://github.com/riscv/riscv-qemu.git isn't a valid URL anymore as it waits for https://git.qemu.org/git/qemu.git

This issue has been fixed in July 2019: riscv-collab/riscv-gnu-toolchain@80fd851

Not sure if we could use this version of riscv-gnu-toolchain with other submodules of ̀rocket-tools.

Reference

https://github.blog/2021-09-01-improving-git-protocol-security-github/
Section Git protocol troubleshooting

If any of them start with git://, you should change the URL to a supported format.

[Pascal Cotret]

Found a solution thanks to @QDucasse. This way, we can still clone the version given in the rocket-chip repository:

git clone https://github.com/chipsalliance/rocket-tools
cd rocket-tools
# Hash given in the rocket-chip repository
git checkout e2c6d1577a75f506fe992c3eb20a75174504476e
git submodule update --init riscv-gnu-toolchain
cd riscv-gnu-toolchain
git submodule set-url riscv-qemu https://github.com/riscv/riscv-qemu.git
git submodule sync
cd riscv-qemu
git submodule set-url roms/qemu-palcode https://github.com/rth7680/qemu-palcode.git
git submodule sync
cd ../..
git submodule update --init --recursive --progress

[Hongren Zheng]

Fixed by c17f76b