Hiveton H5000M DDR4 4GB 3200Mbps Modification Guide

This repository provides a comprehensive guide to upgrading the RAM of the Hiveton H5000M (MT7987A) from the stock 1GB to 4GB DDR4 3200Mbps. This mod achieves stable operation at the default frequency without the need for downclocking.

Environment & Hardware Specifications

• Device Model: Hiveton (Airpi) H5000M
• SoC: MediaTek MT7987A
• RAM Chip: SK Hynix H5ANBG6NAMR-XNC (DDR4 16Gb, x16 DDP High-Density Package)
• Final Frequency: 3200Mbps (Stable at default clock)
• Bootloader Source: hanwckf/bl-mt798x (ATF/BL2)

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Core Solution

Successfully supporting 4GB RAM on the MT7987 at high frequencies requires a combination of Hardware Strapping Adjustment and Software Configuration.

1. Hardware Resistor Modification (Critical)

Based on the MT7988 (BPI-R4) 8GB upgrade reference, the MT7987 requires hardware resistor changes to correctly set the logic levels for the E9 (BG1) and M9 (UZQ) pins. These pins are essential for bank grouping and impedance calibration in high-density chips.

Detailed Steps:

A. Top Side Modification: Locate the cluster of resistors next to the DDR4 chip as shown in the image below. There are five resistors aligned in a row.

• Action: Identify the second resistor from the right. Replace the original 0-ohm resistor with a 240-ohm resistor.

B. Bottom Side Modification: Flip the PCB to the back, directly behind the DDR4 chip.

• Action: Remove the resistor circled in the reference image.

PCB Revision Warning:

• V2 PCB: The layout is compatible with larger 4GB chip footprints.
• V1 PCB: The resistor placement physically obstructs the larger 4GB chip, preventing it from sitting flush on the pads. Verify your PCB version before desoldering.

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2. Software Configuration (ATF/BL2)

In the bl-mt798x source code, follow these steps:

1. Run make menuconfig.
2. Navigate to the memory settings.
3. Enable: Support DDR4 4GB (16-bits).
4. Compile and flash the BL2 image.

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