LX2162A SOM Errata List

Revisions and Notes

Date	Owner	Revision	Notes
November 19, 2022	Rabeeh Khoury	1.0	Released information
May 2, 2023	Rabeeh Khoury	1.1	Errata fix
Dec 31, 2024	Josua Mayer	1.2	Errata for SPD

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Introduction

Short Description	Errata	Affected PCB rev	Fix or workaround
SD1 lane #0 not functional	Due to design bug serdes SD1 lane #0 LX2162 receive are shorted and due to that not functional. The ssignal names are SD1_RX0_N and SD1_RX0_P on the board to board header.	1.0	Fixed and verified in PCB rev 1.1 Will be fixed in rev 1.1
Fan controller PWM not functional. Tachometer and temperature sensors are functional.	Due to design bug, the AMC6821 temperature sensor and fan controller has it’s THERM# signal pulled down permanently, which forces the fan controller to set the RPM to the maximum (PWM signal becomes fixed). Notice that the Tachometer is still functional and unrelated to the THERM# signal.	1.0	Fixed and verified in PCB rev 1.1 Will be fixed in rev 1.1
System unstable under load when using 16GB DDR size variant of SoM.	Due to a mistake in the SPD eeprom the revision 1.1 16GB size variant of SoM operates sdram beyond specification. 8GB variant is not affected. See Update Instructions below.	1.1	Units produced in 2025 or later ship with updated SPD.
ECC Memory assembled but not active.	SoMs revision 1.1 have the parts for ecc memory assembled but not enabled through SPD eeprom. See Update Instructions below.	1.1	Units produced in 2025 or later ship with updated SPD.

Update rev. 1.1 SoM SPD EEPROM

The SPD EEPROM on the SoM can be reprogrammed with updated parameters enabling ECC, and ensuring stable oepration of 16GB variant.

1. Download special recovery image according to SoM and program to microSD card: - For 8GB DDR Size: lx2162a_rev2_som_clearfog_2000_650_2900_18_9_0_staticmem-8G-716a952.img.xz - For 16GB DDR Size: lx2162a_rev2_som_clearfog_2000_650_2900_18_9_0_staticmem-16G-716a952.img.xz
2. Seat SoM on LX2162A Clearfog board, set boot-switches for SD ( OFF ON ON ON X )
3. Boot to Linux, login as “root”:”root”, then execute script for updating SPD:

- For 8GB DDR Size: ./lx2162-som-v11-8gb-spd.sh - For 16GB DDR Size: ./lx2162-som-v11-16gb-spd.sh

The script will program and validate SPD. On success it will show: /sys/bus/i2c/devices/0-0051/eeprom: OK 4. Update is complete, any generic image should be bootable now using updated parameters.

Developers may use the update scripts directly, after disabling spd eeprom in device-tree to allow writing:

lx2162-som-v11-8gb-spd.sh

2KB

Open

lx2162-som-v11-16gb-spd.sh

2KB

Open