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fix(installer): use Limine on 32-bit UEFI firmware

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Atom Bay Trail / Cherry Trail mini-PCs and tablets have a 64-bit CPU behind
32-bit UEFI. We picked systemd-boot there (Arch ships no ia32 build), and
archinstall 4.4's GRUB path hardcodes --target=x86_64-efi, so the installed
system could not boot. archinstall's Limine path copies both BOOTIA32.EFI
and BOOTX64.EFI and chooses the entry by /sys/firmware/efi/fw_platform_size;
the default layout's FAT /boot satisfies its layout check. 64-bit UEFI and
BIOS keep systemd-boot / GRUB.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wq1hzUp4ZmCKHDuLKCnu73
This commit is contained in:
Daniel Maksymilian Syrnicki 2026-09-28 14:21:14 +02:00
parent bfa7ee8cba
commit 455150f97f
2 changed files with 25 additions and 2 deletions
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13
tests/test_app.py
View file

@ -390,3 +390,16 @@ def test_error_page_offers_retry(monkeypatch, tmp_path):
html = app_module.app.test_client().get("/install/log").get_data(as_text=True)
assert "Try again" in html
assert "next-steps" not in html
def test_detect_bootloader_by_firmware(tmp_path):
import app as app_module
efi = tmp_path / "efi"
assert app_module._detect_bootloader(efi) == "Grub" # BIOS / legacy
efi.mkdir()
assert app_module._detect_bootloader(efi) == "Systemd-boot" # no bitness file
(efi / "fw_platform_size").write_text("64\n")
assert app_module._detect_bootloader(efi) == "Systemd-boot"
(efi / "fw_platform_size").write_text("32\n")
assert app_module._detect_bootloader(efi) == "Limine"

14
webinstaller/app.py
View file

@ -515,10 +515,20 @@ def _post_install_commands(hostname, admin_username, admin_password):
]
def _detect_bootloader():
def _detect_bootloader(efi_dir=Path("/sys/firmware/efi")):
# systemd-boot is UEFI-only; on BIOS/legacy it trips HardwareIncompatibilityError
# inside archinstall. /sys/firmware/efi exists iff we were booted via UEFI.
return "Systemd-boot" if Path("/sys/firmware/efi").exists() else "Grub"
if not efi_dir.exists():
return "Grub"
# 64-bit CPU behind 32-bit UEFI (Atom Bay Trail / Cherry Trail mini-PCs
# and tablets): Arch ships no ia32 systemd-boot, and archinstall's GRUB
# path hardcodes --target=x86_64-efi. Its Limine path installs both
# BOOTIA32.EFI and BOOTX64.EFI and picks the entry by firmware bitness.
try:
bitness = (efi_dir / "fw_platform_size").read_text().strip()
except OSError:
bitness = "64"
return "Limine" if bitness == "32" else "Systemd-boot"
def build_archinstall_config(s):