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Read PWM config from /boot/firmware first to support Bookworm and later OSes #230

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Merged
mattjlewis merged 1 commit into from
Feb 2, 2026
Merged

Read PWM config from /boot/firmware first to support Bookworm and later OSes #230

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17 changes: 13 additions & 4 deletions ...re/src/main/java/com/diozero/internal/board/raspberrypi/RaspberryPiBoardInfoProvider.java
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Original file line number Diff line number Diff line change
Expand Up @@ -375,15 +375,24 @@ public PiBoardInfo(String revision, String model, String pcbRevision, int memory
this.manufacturer = manufacturer;
this.processor = processor;

// Read /boot/config.txt to see if the PWM device tree overlay is loaded
// Read /boot/firmware/config.txt or /boot/config.txt to see if the PWM device
// tree overlay is loaded
// Can be max one of "dtoverlay=pwm," or "dtoverlay=pwm-2chan,"
try {
gpioToPwmNumberMapping = Files.lines(Paths.get("/boot/config.txt"))
// /boot/firmware is used on Raspberry Pi OS Bookworm and later
gpioToPwmNumberMapping = Files.lines(Paths.get("/boot/firmware/config.txt"))
.filter(line -> line.startsWith("dtoverlay=pwm")).findFirst()
.map(RaspberryPiBoardInfoProvider::extractPwmGpioNumbers).orElse(Collections.emptyMap());
} catch (IOException e) {
gpioToPwmNumberMapping = new HashMap<>();
// Ignore
try {
// /boot was used before Raspberry Pi OS Bookworm
gpioToPwmNumberMapping = Files.lines(Paths.get("/boot/config.txt"))
.filter(line -> line.startsWith("dtoverlay=pwm")).findFirst()
.map(RaspberryPiBoardInfoProvider::extractPwmGpioNumbers).orElse(Collections.emptyMap());
} catch (IOException e2) {
gpioToPwmNumberMapping = new HashMap<>();
// Ignore
}
}
}

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