Update sysint-soc configuration and install priority fix

[ArunSundar-1805]

Problem

1) hciuart.service Failure

hciuart.service intermittently fails during system boot with the following error:

Can't open serial port: No such file or directory

This occurs because hciuart.service attempts to access /dev/ttyAMA0 before the UART device is fully initialized by the kernel/device-tree.

As a result:

• The service enters a failed state during boot

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2) oem-first-boot.service Failure

oem-first-boot.service fails during boot with the following error:

[OEM-FIRST-BOOT] Error: 'mfr_util' not found in PATH

This happens because the service script (oem-first-boot.sh) depends on the mfr_util binary, which is not present in the Raspberry Pi RDKE vendor image.

As a result:

• The service exits with failure
• systemd marks it as a failed unit

---

Root Cause

hciuart.service

The failure is caused by a boot-time race condition:

• /dev/ttyAMA0 is created asynchronously during kernel initialization
• hciuart.service starts before the device becomes available

---

oem-first-boot.service

The failure is caused by a missing runtime dependency:

• oem-first-boot.sh requires mfr_util
• No recipe in the current build provides /usr/bin/mfr_util

---

Solution

1) Fix for hciuart.service

A systemd drop-in override has been added for hciuart.service:

/etc/systemd/system/hciuart.service.d/override.conf

This override:

• Adds dependency on the UART device:

Requires=dev-ttyAMA0.device
After=dev-ttyAMA0.device

• Adds a pre-start check to ensure device availability
• Enables automatic restart on failure

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2) Fix for oem-first-boot.service

A systemd drop-in configuration has been added:

<systemd-unit-dir>/oem-first-boot.service.d/00-mfr-util.conf

This drop-in:

• Adds a condition:

ConditionPathExists=/usr/bin/mfr_util

• Ensures the service only runs if mfr_util is present
• Skips the service cleanly when the dependency is unavailable instead of failing

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Implementation

hciuart.service

Added file:

systemd_units/hciuart.service.d/override.conf

Installed into:

/etc/systemd/system/hciuart.service.d/

---

oem-first-boot.service

Added file:

systemd_units/oem-first-boot.service.d/00-mfr-util.conf

Updated sysint-soc.bb to install the drop-in into:

${systemd_unitdir}/system/oem-first-boot.service.d/

Updated packaging to include drop-in directories:

FILES:${PN} += "${systemd_unitdir}/system/*.d/*"

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Configuration Details

override.conf (hciuart.service)

[Unit]
Requires=dev-ttyAMA0.device
After=dev-ttyAMA0.device
StartLimitIntervalSec=0

[Service]
ExecStartPre=/bin/sh -c 'i=0; while [ $i -lt 5 ]; do [ -e /dev/ttyAMA0 ] && exit 0; sleep 1; i=$((i+1)); done; exit 1'
Restart=on-failure
RestartSec=2

---

10-mfr-util.conf (oem-first-boot.service)

[Unit]
ConditionPathExists=/usr/bin/mfr_util

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Result

hciuart.service

• Ensures the service starts only after /dev/ttyAMA0 is available
• Eliminates intermittent boot failures
• Removes the need for manual restarts after reboot/flash

---

oem-first-boot.service

• Prevents service failure when mfr_util is not present
• Ensures clean system boot without failed units
• Maintains expected behavior when MFR support is available

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[ArunSundar-1805]

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