[Bug]: bananapif3 - cannot compile a customized kernel

[ssinyagin]

What happened?

Current commit: 723d5f0 (April 28).

I'm trying to build a usable image for BananaPi F3. The default Ubuntu 24.04 build resulted in a 6.6.87 kernel that doesn't have the drivers/net/tun module, which is required for OpenVPN.

If I launch the compile script and choose to modify the kernel options, and even if I don't modify the options, the build fails with an error:

   Assembler messages:
   Error: rv64imac_zicond_zicsr_zifencei_zihintpause_zba_zbb_zbc_zbs: unknown prefixed ISA extension `zicond'
   /tmp/ccH98UG9.s:3: Error: rv64i2p1_m2p0_a2p1_c2p0_zicond_zicsr2p0_zifencei2p0_zihintpause_zba1p0_zbb1p0_zbc1p0_zbs1p0: unknown prefixed ISA extension `zicond'

a full log follows. It seems like the GCC version is too old for zicond support.

log-build-b498a0e1-b40e-4546-8232-e448f7f7e7f0.log

How to reproduce?

see the log

Branch

main (main development branch)

On which host OS are you running the build script and observing this problem?

Debian 12 Bookworm

Are you building on Windows WSL2?

• Yes, my Ubuntu/Debian/OtherOS is running on WSL2

Relevant log URL

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

Jira ticket: AR-2670

[igorpecovnik]

try using switch DOCKER_ARMBIAN_BASE_IMAGE="ubuntu:noble"

[ssinyagin]

same error, using DOCKER_ARMBIAN_BASE_IMAGE="ubuntu:noble" KERNEL_GIT=shallow ./compile.sh

[ssinyagin]

it needs GCC 14, but the builder uses riscv64-linux-gnu-gcc 12.2.0

https://stackoverflow.com/questions/77350365/how-to-compile-for-riscv-zicond-extension-in-gcc

[ssinyagin]

I haven't checked what is generating this assembler code. Maybe there's a way to avoid using the extension.

[ssinyagin]

Zicond can be disabled in kernel config. I'm compiling now with these settings, and it looks good so far:

# CONFIG_RISCV_ISA_ZICOND is not set
CONFIG_TUN=m

[ssinyagin]

it works now. Please incorporate these two options in default kernel config.

[rpardini]

@ssinyagin @igorpecovnik DOCKER_ARMBIAN_BASE_IMAGE ofc only works if using Docker. Doesn't seem to be the case here -- thus a Noble+ host would be required.

[ssinyagin]

@rpardini zicond performance gain doesn't look very serious, so it's probably better to keep the builder compatible with bookworm by default.

[rpardini]

I was not involved into that kernel effort -- maybe @pyavitz knows more?

[pyavitz]

Zicond can be disabled in kernel config. I'm compiling now with these settings, and it looks good so far:

# CONFIG_RISCV_ISA_ZICOND is not set
CONFIG_TUN=m

Does this change break anything?

[ssinyagin]

Zicond can be disabled in kernel config. I'm compiling now with these settings, and it looks good so far:

# CONFIG_RISCV_ISA_ZICOND is not set
CONFIG_TUN=m

Does this change break anything?

doesn't look like. The device is running stable since two days.

[pyavitz]

Zicond can be disabled in kernel config. I'm compiling now with these settings, and it looks good so far:

# CONFIG_RISCV_ISA_ZICOND is not set
CONFIG_TUN=m

Does this change break anything?

doesn't look like. The device is running stable since two days.

Building the kernel outside of Armbian I can't reproduce this error:

   Assembler messages:
   Error: rv64imac_zicond_zicsr_zifencei_zihintpause_zba_zbb_zbc_zbs: unknown prefixed ISA extension `zicond'
   /tmp/ccH98UG9.s:3: Error: rv64i2p1_m2p0_a2p1_c2p0_zicond_zicsr2p0_zifencei2p0_zihintpause_zba1p0_zbb1p0_zbc1p0_zbs1p0: unknown prefixed ISA extension `zicond'

I'm using Ubuntu Noble (Aarch64) as my HOST machine and GCC-13. If you like, I can make the defconfig change via PR, but it does look fishy to me.

[ssinyagin]

I had the impression that the build environment should work under Bookworm as well