redhat: Enable RISC-V arch for centos/eln
Added a section to priority.rhel in order to start generating riscv64 configs. kernel.spec.template is likewise updated to add riscv64 to the arch list for the rhel build flavor.
Note that the RHEL 10 RISC-V Developer Preview was announced at Red Hat Summit and is already available:
- https://www.redhat.com/en/blog/red-hat-partners-with-sifive-for-risc-v-developer-preview-for-red-hat-enterprise-linux-10
- https://riscv.org/ecosystem-news/2025/05/sifive-collaborates-with-red-hat-to-support-red-hat-enterprise-linux-for-risc-v/
- https://developers.redhat.com/products/rhel-riscv
Although that preview targets the SiFive HiFive Premier P550, the drivers for that system have not yet been accepted in the upstream kernel, so this MR only enables the virt target for a RISC-V kernel that is able to boot within QEMU but does not include drivers that would be needed to boot on any specific RISC-V hardware. The developer preview kernel source with P550 drivers is available at https://gitlab.com/CentOS/isa/src/kernel/centos-stream-10/-/tree/p550
There do not currently exist any announcements for future RHEL RISC-V releases, updates, or images. Contributions and builds will continue in CentOS. RISC-V koji builders for both CentOS and Fedora are currently being worked on in parallel over the next several weeks.
The CI jobs enabled by this MR ensure that the RISC-V kernel merely builds without error when cross-compiled; not enough RISC-V hardware is available yet for the computing demands of CI runners.
Co-developed-by: Charles Mirabile cmirabil@redhat.com Signed-off-by: Charles Mirabile cmirabil@redhat.com Signed-off-by: Jennifer Berringer jberring@redhat.com