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Apply SBC overlay upgrade fix, add PCIe Gen 3 docs
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Apply overlay patch 0003 (EFI mount path detection for SBC layouts)
in the build so upgrades write firmware/config.txt to the correct
path. Update README with patch 0003, PCIe Gen 3 in features list,
and expanded PCIe Gen 3 instructions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Mathias Beaulieu-Duncan 2026-02-18 14:29:17 -05:00
parent 5152b6cb44
commit d4a55c670c
2 changed files with 21 additions and 6 deletions
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3
Makefile
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@ -124,7 +124,8 @@ patches-overlay:
else \
echo "Overlay Go $$GO_VER — skipping Go toolchain patch (CVEs fixed upstream)"; \
fi && \
git am "$(PATCHES_DIRECTORY)/talos-rpi5/sbc-raspberrypi5/0002-"*.patch
git am "$(PATCHES_DIRECTORY)/talos-rpi5/sbc-raspberrypi5/0002-"*.patch && \
git am "$(PATCHES_DIRECTORY)/talos-rpi5/sbc-raspberrypi5/0003-"*.patch
patches: patches-pkgs patches-talos patches-overlay

24
README.md
View File

@ -59,6 +59,7 @@ In-place upgrades are fully supported. The image includes patches to force GRUB
- SBC EFI-only boot layout support (probe, install, revert all fall back to EFI partition when BOOT partition is absent)
- Fallback to classic bind mounts on kernels without `open_tree` support (Linux <6.15)
- Overclock: 2.6GHz (`arm_freq=2600`, `over_voltage_delta=50000`, `arm_boost=1`)
- PCIe Gen 3 enabled for NVMe (~800 MB/s, via `dtparam=pciex1_gen=3` in `config.txt`)
- Extensions: `iscsi-tools`, `util-linux-tools`
## Known issues
@ -87,6 +88,7 @@ Talos ignores the `machine.install.disk` config field on SBC platforms. You **mu
| `0005` (talos) | GRUB | Handle missing BOOT partition for SBC EFI-only disk layouts |
| `0001` (overlay) | Toolchain | Bump Go to 1.24.13 (CVE fix) |
| `0002` (overlay) | Console | Fix serial console for RPi5/CM5 debug UART (`ttyAMA10`) |
| `0003` (overlay) | Upgrade | Detect EFI mount path for SBC layouts (no BOOT partition) |
## Roadmap
@ -145,14 +147,26 @@ Power on. The RPi firmware should find the boot partition on NVMe, load U-Boot,
### Optional: enable PCIe Gen 3
Add to your `configTxtAppend` overlay option or directly to `config.txt` on the boot partition:
PCIe Gen 3 doubles NVMe throughput (~400 MB/s → ~800 MB/s). Not officially certified by Raspberry Pi but stable on most NVMe drives.
```ini
dtparam=pciex1_gen=3
**New installs** — PCIe Gen 3 is enabled by default in images built from this repo (`config.txt.append` includes `dtparam=pciex1_gen=3`).
**Existing nodes** — After a `talosctl upgrade`, the overlay rewrites `config.txt` with the baked-in settings (including PCIe Gen 3). If you need to enable it manually on an older image:
1. Power off the node and remove the NVMe drive
2. Connect via USB adapter and mount the first (EFI) partition
3. Add to `config.txt` under the `[pi5]` section:
```ini
dtparam=pciex1_gen=3
```
4. Unmount, reinstall the drive, and power on
To verify after boot:
```bash
talosctl -n <ip> dmesg | grep -i pcie
# Look for "Gen 3" in the PCIe link speed output
```
This doubles throughput (~400 MB/s Gen 2 to ~800 MB/s Gen 3). Not officially certified by Raspberry Pi but works on most NVMe drives.
## Building
For local builds, CI/CD setup, runner configuration, and project structure, see [TECHNICAL.md](TECHNICAL.md).