32 lines
1.2 KiB
Markdown
32 lines
1.2 KiB
Markdown
# Arch Linux s390x
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A port of Arch Linux to IBM s390x mainframe architecture with systemd support.
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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.
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## Quick Start
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```bash
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make container # build dev container (first time)
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cp .env.example .env # configure z/VM access
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make all # build kernel + initramfs + systemd
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make test-systemd # boot it
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```
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## What Works
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- Arch Linux kernel 6.18.6-arch1 with Arch patches, cross-compiled
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- Initramfs via modified mkinitcpio
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- Static busybox built natively on z/VM, 2.3MB
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- Root filesystem with ext4, switch_root to real rootfs
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- Systemd as PID 1
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Pacman, bash, and GNU coreutils are not yet ported.
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## Build System
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The build uses two tiers:
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**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.
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**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.
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