55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
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# Arch Linux Kernel Build for s390x
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This directory contains the infrastructure for building the Arch Linux kernel for IBM s390x mainframe architecture.
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## Overview
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The Arch Linux kernel build process has been adapted for cross-compilation to s390x. This maintains compatibility with Arch Linux's kernel patches and configuration while targeting mainframe hardware.
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## Files
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- `PKGBUILD-s390x` - Modified PKGBUILD for s390x cross-compilation
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- `config-s390x` - Kernel configuration optimized for s390x with Arch Linux defaults
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- `linux/` - Clone of Arch Linux kernel packaging repository (reference only)
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## Key Differences from Standard Arch Kernel
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1. **Cross-compilation**: Uses `s390x-linux-gnu-gcc` toolchain
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2. **Architecture-specific config**: Includes s390x drivers (DASD, QETH, channel I/O)
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3. **No documentation build**: Skipped for cross-compilation efficiency
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4. **s390x boot image**: Uses `arch/s390/boot/bzImage` instead of x86 boot image
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## Building
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From the project root:
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```bash
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# Build Arch Linux kernel with patches
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make arch-kernel
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# Or build vanilla kernel (without Arch patches)
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make kernel
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```
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## Configuration
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The `config-s390x` file includes:
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- Standard Arch Linux kernel features (systemd requirements, cgroups, namespaces)
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- s390x hardware support (DASD storage, QETH networking, z/VM integration)
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- IBM mainframe specific drivers and console support
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- Security features (SELinux, AppArmor, BPF)
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## Kernel Versions
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The build process tracks the official Arch Linux kernel version and applies the same patches used in the x86_64 build.
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## Integration with Project
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The built kernel integrates with the existing mkinitcpio-based initramfs generation to create a complete bootable s390x system.
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## Future Improvements
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- Automated patch retrieval for new kernel versions
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- Integration with Arch Linux package repository
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- Native s390x package building (when hardware available)
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