No description
Mathieu Benoit
ef143aac67
zlib stopped on '__builtin_s390_vec_unpackl' requires '-mvx', after its own configure had detected vector support and defined -DHAVE_S390X_VX. Both halves were right, so it was worth measuring rather than patching: host gcc (Ubuntu) --with-arch=z13 --with-tune=z16 default -march=arch11 our gcc nothing default -march=arch5 arch5 is z900, from 2000. Arch's PKGBUILD names no s390x baseline because Arch has no s390x, so ours fell back to the oldest machine imaginable while zlib went on detecting a CPU the compiler had been told to forget. Every distribution picks one of these; this port had never said which, and silence chose 2000. z13 is what Ubuntu s390x already requires, so nothing that runs today stops. Set in two places: makepkg.conf, how this distribution is compiled, and gcc's --with-arch, what the compiler we ship assumes with no flags at all. --- FR --- zlib s'est arrêté sur '__builtin_s390_vec_unpackl' requires '-mvx', après que son propre configure avait détecté le support vectoriel et défini -DHAVE_S390X_VX. Les deux moitiés avaient raison : il fallait mesurer, pas rustiner. gcc de l'hôte --with-arch=z13 --with-tune=z16 défaut -march=arch11 notre gcc rien défaut -march=arch5 arch5, c'est z900, de l'an 2000. Le PKGBUILD d'Arch ne nomme aucune base s390x puisque Arch n'a pas de s390x : le nôtre retombait sur la machine la plus ancienne imaginable pendant que zlib détectait un processeur qu'on avait dit au compilateur d'oublier. Toute distribution en choisit une ; ce portage ne l'avait jamais dit, et le silence a choisi 2000. z13 est ce qu'Ubuntu s390x exige déjà : rien qui tourne aujourd'hui ne cesse de tourner. Posé aux deux endroits : makepkg.conf, comment cette distribution est compilée, et le --with-arch de gcc, ce que suppose le compilateur qu'on livre. Assisted-by: Claude Opus 5 |
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| boot | ||
| patches | ||
| scripts | ||
| .env.example | ||
| .gitignore | ||
| CODEOWNERS | ||
| Containerfile | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| TODO.md | ||
Arch Linux s390x
A port of Arch Linux to IBM s390x mainframe architecture with systemd support.
Boots a full Arch Linux system on IBM mainframes (or QEMU s390x emulation) using a hybrid build: cross-compilation for the kernel, native s390x compilation on z/VM for userspace.
Quick Start
make container # build dev container (first time)
cp .env.example .env # configure z/VM access
make all # build kernel + initramfs + systemd
make test-systemd # boot it
What Works
- Arch Linux kernel 6.18.6-arch1 with Arch patches, cross-compiled
- Initramfs via modified mkinitcpio
- Static busybox built natively on z/VM, 2.3MB
- Root filesystem with ext4, switch_root to real rootfs
- Systemd as PID 1
Pacman, bash, and GNU coreutils are not yet ported.
Build System
The build uses two tiers:
Cross-compilation (x86_64 host): Kernel is built in a Fedora 43 container with s390x-linux-gnu-gcc. Initramfs is generated with a patched mkinitcpio that handles cross-architecture binary injection.
Native compilation (s390x z/VM): Busybox and systemd must be built on real s390x hardware. The z/VM system runs RHEL 9.6 with GCC 11.5.0. Scripts handle SSH deployment and retrieval automatically via .env configuration.