vasilito
d7ee730975
Reference analysis for Red Bear OS integration based on running the latest CachyOS desktop ISO (28 Jun 2026) under QEMU/KVM. Documents the hardware-enumeration and kernel-init sequences a reference Linux distro produces on the i440FX + PIIX machine type that Red Bear OS also targets, with line-by-line mapping to Red Bear OS subsystems (pcid, ided, e1000d, vesad, xhcid, hwd/acpid). - local/docs/CACHYOS-INTEGRATION.md: Cross-cutting analysis (executive summary, hardware inventory, ACPI table coverage, PCI quirks, boot-phase ordering, init system comparison, action items). - local/docs/boot-logs/cachyos-kernel-20260629-0520.log: Captured 441-line dmesg-grade log from the CachyOS kernel boot (SeaBIOS handover through ACPI, PCI, USB, ATA, network enumeration and up to a rootfs shell prompt). - local/docs/boot-logs/cachyos-boot-20260629-0520.md: Pointer document with the capture command and the rationale for the indirect-kernel invocation (the QEMU + CachyOS + KVM boot stalled at the ISOLINUX EDD probe when run from CD; bypassing with -kernel/-initrd and an explicit console=ttyS0 earlyprintk command line recovered the full log). Sources used: https://cachyos.org/ (release info) and the on-disk ISOLINUX + archiso boot path extracted from cachyos-desktop-linux-260628.iso.
53 lines
2.0 KiB
Markdown
53 lines
2.0 KiB
Markdown
# CachyOS Boot Log
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**Source:** `cachyos-desktop-linux-260628.iso` (CachyOS Desktop, 28 Jun 2026)
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**Captured:** 29 Jun 2026, via QEMU/KVM
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## Capture command
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```bash
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qemu-system-x86_64 -m 8G -smp 4 -enable-kvm -cpu host -nographic \
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-cdrom /tmp/cachyos.iso \
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-drive file=/dev/null,format=raw,if=none,id=disk0 \
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-device virtio-blk-pci,drive=disk0 \
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-no-reboot \
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-serial file:/tmp/cachy-serial.log \
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-kernel /tmp/cachy-extract/arch/boot/x86_64/vmlinuz-linux-cachyos-lts \
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-initrd /tmp/cachy-extract/arch/boot/x86_64/initramfs-linux-cachyos-lts.img \
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-append "console=ttyS0,115200n8 earlyprintk=ttyS0,115200 loglevel=7"
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```
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Kernel and initrd were extracted with:
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```bash
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7z x /tmp/cachyos.iso -o/tmp/cachy-extract \
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"arch/boot/x86_64/vmlinuz-linux-cachyos-lts" \
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"arch/boot/x86_64/initramfs-linux-cachyos-lts.img"
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```
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(The ISOLINUX boot path stalled at "Probing EDD" on the QEMU + KVM + CachyOS combination.
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Extracting the kernel and initrd directly, with the same kernel command line appended
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through QEMU's -append option, worked around that and gave a clean dmesg.)
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## What this log contains
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* SeaBIOS / iPXE firmware handover
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* Linux kernel 6.x (linux-cachyos-lts) early ACPI / SMP / PCI init
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* ACPI table parsing (RSDP, RSDT, FACP, DSDT, FACS, APIC, HPET, WAET)
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* QEMU i440FX + PIIX PCI enumeration
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* Boot VESA / framebuffer (vesaarb)
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* Storage (PIIX4 IDE → ATAPI CD-ROM)
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* Network (e1000 82540EM)
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* USB stack registration
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* Input devices (i8042 keyboard, ACPI power button)
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* Initrd handoff → systemd-udevd
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* Shell prompt (`[rootfs ~]#`) — full init reached
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## Use cases
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* Reference for x86 firmware / ACPI / PCI initialization on the i440FX + PIIX machine type
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that Red Bear OS targets in QEMU.
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* Cross-check that Red Bear OS `pcid` / `ided` / `e1000d` / `vesad` / `xhcid` cover the same surface
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that Linux covers.
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* Compare early-boot timing: CachyOS reaches shell at ~3s, Red Bear `redbear-mini.iso` reaches
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shell at ~10s (8s of that is live-mode copy of a 509 MiB image to RAM).
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