Mathias Beaulieu-Duncan
3cfbe794f7
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The CM5 DTB (bcm2712-rpi-cm5-cm5io.dtb) lacks the pciex1 alias that the Pi 5 DTB provides, making dtparam=pciex1_gen=3 silently fail. Add a custom device tree overlay (pcie-gen3.dtbo) that targets /axi/pcie@1000110000 directly to set max-link-speed = <3>. The overlay is embedded in the SBC installer and written to /boot/EFI/overlays/ during install/upgrade. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
# See https://www.raspberrypi.com/documentation/computers/configuration.html
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# Reduce GPU memory to give more to CPU.
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gpu_mem=32
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# Enable maximum compatibility on both HDMI ports;
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# only the one closest to the power/USB-C port will work in practice.
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hdmi_safe:0=1
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hdmi_safe:1=1
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# Load U-Boot.
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kernel=u-boot.bin
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# Forces the kernel loading system to assume a 64-bit kernel.
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arm_64bit=1
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# Run as fast as firmware / board allows.
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arm_boost=1
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# Enable the primary/console UART (globally).
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enable_uart=1
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# Disable UART on Pi5 to avoid U-Boot compatibility issue.
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# The debug UART (ttyAMA10) is always active regardless of this setting.
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[pi5]
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enable_uart=0
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# Enable PCIe Gen 3 for NVMe (~800 MB/s vs ~400 MB/s Gen 2)
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# CM5 DTB lacks the pciex1 alias needed for dtparam=pciex1_gen=3,
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# so we use a custom overlay that targets pcie@1000110000 directly.
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dtoverlay=pcie-gen3
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[all]
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# Disable Bluetooth.
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dtoverlay=disable-bt
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# Disable Wireless Lan.
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dtoverlay=disable-wifi
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# CM5 Overclock — 2.6GHz stable on Compute Blade with heatsink
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arm_freq=2600
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over_voltage_delta=50000
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arm_boost=1
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