Is CentOS Stream 9 or RHEL 9 binrpm package creation supported?

[tfejos]

Hi,
I downloaded https://github.com/L4STeam/linux/archive/refs/heads/testing.zip yesterday.
On a CentOS Stream 9 host I tried the following commands:

export BUILD_NUMBER=2
BUILD_NUMBER=${BUILD_NUMBER:-1} make -j$(nproc) binrpm-pkg LOCALVERSION=-prague-${BUILD_NUMBER} \ KRPM_PKGVERSION=2

Build failed on CentOS Stream 9, but could build it on CentOS Stream 8.
The package can be installed by rpm or dnf but the newly installed kernel cannot be found in grub.

Is CentOS Stream 9 or RHEL 9 supported or not yet?
What method do you suggest to add the new kernel to grub?

/usr/bin/br --by tfejos

[minuscat]

You can try below v6 kernel if that works on RHEL9 or CentOS9 Steram OS: https://github.com/minuscat/l4steam-6.6.y
The pre-built kernel can be found: https://github.com/minuscat/l4steam-6.6.y/releases/download/testing-build/l4s-testing.zip

The kernel is patched on top of v6.6.40 LTS kernel now, and we will further move to newer v6.6.y kernel
That branch will soon move back to L4STeam.