Errata
ER01
| ID | ER01 |
| Summary | Insufficient RTC accuracy results in an RTC time error beyond the acceptable range. |
| Affects | ED-CM0NANO Rev001 |
| Description | During testing of the ED-CM0NANO RTC accuracy, our engineers observed a discrepancy between the RTC time and the standard time obtained via network synchronization. Over 48 hours of comparison, the RTC time was approximately 6 s to 7 s faster than the network-synchronized standard time. |
| Workaround | First connect the device to the network, then install the ed-rtc deb package to synchronize the network time to the RTC, ensuring accurate RTC time. The ED-CM0NANO units shipped by our company have the ed-rtc deb package pre‑installed by default (if the operating system is reinstalled, the ed-rtc deb package will be installed automatically during Firmware installation). |
| Fixed by | Will be fixed in the ED‑CM0NANO Rev002 version. |
ER02
| ID | ER02 |
| Summary | The ED-CM0NANO cannot be powered on normally via the Raspberry Pi 27 W USB‑C power supply or the Raspberry Pi 45 W USB‑C power supply when an HDMI display is connected first. |
| Affects | ED-CM0NANO Rev001 |
| Description | When using the ED‑CM0NANO, if an HDMI display is connected first, and then the board is powered on with a Raspberry Pi 27 W USB‑C power supply or a Raspberry Pi 45 W USB‑C power supply, the ED‑CM0NANO fails to boot normally. After verification and analysis, the root cause was identified as follows: The power‑delivery protocol of the Raspberry Pi 27 W USB‑C power supply and the Raspberry Pi 45 W USB‑C power supply differs from that of standard Type‑C power supplys. The ED‑CM0NANO power‑supply design is based on the standard Type‑C power supply power‑delivery protocol. Therefore, when an HDMI display is connected first, a 5 V back‑feed occurs in the power domain; subsequently connecting a Raspberry Pi 27 W or 45 W USB‑C power supply prevents the power supply from supplying power correctly to the ED‑CM0NANO. |
| Workaround | Disconnect the HDMI display first, then reconnect the Raspberry Pi 27 W USB‑C power supply or the Raspberry Pi 45 W USB‑C power supply. |
| Fixed by | Will be fixed in the ED‑CM0NANO Rev002 version. |