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Troubleshooting

Power‑off hangs

Symptom: systemctl poweroff leaves the board powered on; manual power‑cycle required.

Root cause: Linux sets POWER_OFF_NOTIFICATION=LONG in the eMMC EXT_CSD, putting the eMMC into a low‑power state that the BootROM cannot wake.

Fix: Enable syscon‑reboot‑mode DTB node (adds a clean reboot path) or use the emergency‑reboot.shutdown systemd script which triggers sysrq b hard reset.

Sources: evidence/emmc-reset-evaluation.txt, evidence/live-system/emergency-reboot.shutdown.

Network TX storms / low throughput

Symptom: Massive retransmits, throughput ≈ 1 Mbps.

Cause: Device Tree enables snps,tso (TCP Segmentation Offload) on the GMAC, which the driver mishandles.

Resolution: Remove the snps,tso property from the DTB (kernel 6.18.41). Verify with ethtool -k eth0 → tso: off. Throughput improves to ~30 Mbps.

Sources: evidence/live-system/tso-diagnosis-2026-07-31.txt, evidence/live-system/tso-fix-verification-2026-07-31.txt.

GMAC0 watchdog storms

Symptom: Repeated watchdog messages in the kernel log.

Cause: GMAC0 is enabled without a physical link, generating spurious watchdog events.

Fix: Disable GMAC0 in the DTB (set status = "disabled"). The system now only uses GMAC1 for the RTL8367S switch.

Source: aa3057ab-54c5-4ffc-ba85-c2f2396ee60c.

Accidental SPI‑NOR overwrite

Symptom: Flashing the SPL to SPI‑NOR overwrites the boot region; on power‑cycle the board falls back to MaskROM.

Mitigation: RKDevTool warns when the target storage is SPI‑NOR. Additionally, the build scripts enforce:

  • Target verification via SHA‑256 manifest.
  • Mandatory flash_erase before writing.

Source: aa3057ab-54c5-4ffc-ba85-c2f2396ee60c.

Docker proxy leakage

Symptom: Proxy environment variables leak into the Docker container, causing network failures.

Solution: The orchestrator strips proxy vars inside Docker and uses optional G18PRO_PROXY only when explicitly set. .curlrc, .wgetrc, and Git insteadOf are also configured.

Source: Batch 2/16, 4.

CRLF line‑ending corruption

Symptom: Files edited on Windows acquire CRLF line endings, breaking scripts inside the Docker container.

Remedy: Enforce LF line endings via .gitattributes and set core.autocrlf=false.

Source: ff34c6eb-6bba-41e5-9e43-ff80941fa823.

PCIe BAR allocation failures

Symptom: Kernel logs report BAR 0: can't assign; no space.

Work‑around: Add kernel cmdline pci=realloc (or pci=assign-busses). This re‑allocates address windows to avoid overlaps.

Source: evidence/vendor-backup/vendor-kern.log.net-lines.txt.

Rockusb driver installation issues

Problem: Windows requires a signed catalog (rockusb.cat) which is not shipped.

Temporary fix: Install the driver in Test‑Signed mode (pnputil /add-driver rockusb.inf /install) or generate a signed catalog using a code‑signing certificate.

Security note: The INF grants Everyone full read/write/execute access (D:P(A;;GRGWGX;;;WD)). Consider tightening the descriptor for production environments.

Sources: 13, 14, 15.

References

  • aa3057ab-54c5-4ffc-ba85-c2f2396ee60c
  • evidence/emmc-reset-evaluation.txt
  • evidence/live-system/emergency-reboot.shutdown
  • evidence/live-system/tso-diagnosis-2026-07-31.txt
  • evidence/live-system/tso-fix-verification-2026-07-31.txt
  • evidence/vendor-backup/vendor-kern.log.net-lines.txt
  • 4
  • 13
  • 14
  • 15
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