Unified DDR Flasher

README Addition — Ordering & Contact Information

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Ordering Information

Hardware Pricing

Item	Price
Main board (DDR4 & DDR5 SO-DIMM support)	$150
Extension board (DDR4 & DDR5 UDIMM support, more boards coming soon)	$25

Due to increasing component costs, pricing may change over time.

Availability

Due to currently limited component availability, shipping can only begin from the end of May 2026, and possibly around mid-June depending on component availability.

Order Process

Orders are handled through PayPal invoices.

Once an order is confirmed, a PayPal invoice will be sent for the full amount of the ordered items. Shipping costs are calculated separately once the package is prepared and ready to ship.

To place an order, please provide:

• Full name
• PayPal email address (must match the invoice email)
• Items you would like to purchase
• Country

A full shipping address is only required later when the package is prepared for shipment.

Shipping

• Shipping costs, import duties, taxes, and any other fees must be paid by the buyer.
• Shipping is normally done from Hungary using DHL.
• Other shipping arrangements may also be possible.
• The package should fit inside an A4-sized letter package.

Contact

For ordering inquiries or support:

• Email: h43to.code@gmail.com
• PayPal: https://paypal.me/H43TO

About the program

A GUI and CLI tool for reading, writing, and programming SPD EEPROMs (DDR4/DDR5) and PMIC registers on memory modules, using the RP2040-based UDF programmer hardware.

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Features

• Read & write SPD EEPROMs — full 256/512/1024-byte dumps, with automatic write-protect handling for DDR4 (RSWP) and DDR5 (block-level RSWP via SPD5 hub register MR12).
• Decode SPD per JEDEC 21-C / JESD400-5D — module type, capacity, CAS latencies, all primary timing parameters in nCK + ps, CRC verification with a Recalc & Fix CRC button, and support for all module form factors (UDIMM, RDIMM, LRDIMM, SO-DIMM, CAMM2 …).
• Program PMICs — read/write any register, burn vendor MTP blocks with proper unlock/lock sequencing, monitor live voltages, currents, and per-rail power.
• Full CLI mode — every operation is scriptable; output as text, JSON, or raw hex; well-defined exit codes; optional --reconnect-timeout for robust scripting over flaky cables.
• Automatic connection recovery — transparent single-retry on USB transient faults; I2C clock fallback from 400 kHz → 100 kHz on marginal socket contacts; host-level reconnect loop on USB re-enumeration.

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Supported Hardware

Memory Type	Read	Write	RSWP	PMIC
DDR4 UDIMM / RDIMM / SO-DIMM	✅	✅	✅	❌
DDR5 UDIMM / RDIMM / SO-DIMM	✅	✅	✅	✅
DDR5 CUDIMM / CSODIMM / MRDIMM	✅	✅	✅	✅

PMIC support covers PMIC5000 / 5010 / 5020 / 5030 / 5100 / 5120 / 5200.

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Requirements

• Windows 10 (1903+) or Windows 11
• .NET Framework 4.8.1 runtime (pre-installed on Windows 11; available free from Microsoft for Windows 10)
• UDF programmer hardware connected via USB

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Installation

1. Download the latest release ZIP from the Releases page.
2. Extract and run Unified-DDR-Flasher.exe — no installer required.
3. Connect the UDF programmer via USB. Windows 10/11 installs the CDC serial driver automatically; the device enumerates as a COMx port.
4. If this is a fresh device, flash the firmware first (see Firmware Update below).

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Firmware Update

1. Hold the BOOTSEL button on the RP2040 board while plugging it in.
2. The board enumerates as a mass-storage drive named RPI-RP2.
3. Drag firmware/UDF_fw.uf2 onto that drive. It reboots automatically.
4. The status LED goes steady-on once the firmware is ready.

If the application reports "Firmware returned UNKNOWN (0x3F)", the firmware predates this host build. Reflash with the matching UDF_fw.uf2.

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GUI Quick Start

1. Open the Flasher Configuration tab (default on first launch).
2. Pick the COM port and click Connect. The status bar turns green.
3. Switch to SPD Operations. Detected modules appear in the address dropdown. Pick one and click Read SPD.
4. The hex viewer shows the raw bytes. Click Parsed Fields ▶ to expand the JEDEC-decoded panel (timings in nCK + ps, capacity, CAS latencies, CRC status).
5. To write, click Open Dump… to load a .bin file, then Write All.

The Recalc & Fix CRC button patches the in-memory dump so the next Write All produces a valid CRC. It does not push to the DIMM by itself.

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PMIC Operations

The PMIC tab supports DDR5 PMICs.

• Read All Registers dumps the full 256-byte register space.
• Live Measurements shows real-time voltages (mV), currents (mA), and per-rail powers (mW).
• Burn Vendor Block writes one of the three 16-byte MTP blocks. This is irreversible — confirmation is required.
• Change Password reprograms the vendor unlock password (MTP-burned).

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CLI Mode

All GUI features are available headless. Run with no arguments to open the GUI; pass any argument to enter CLI mode.

Unified-DDR-Flasher.exe --help
Unified-DDR-Flasher.exe ping --port COM4
Unified-DDR-Flasher.exe scan --port COM4 --output-format json
Unified-DDR-Flasher.exe spd read 50 --port COM4 --out my_module.bin
Unified-DDR-Flasher.exe spd parse 50 --port COM4
Unified-DDR-Flasher.exe spd parse-file my_module.bin
Unified-DDR-Flasher.exe spd write 50 --port COM4 --in my_module.bin
Unified-DDR-Flasher.exe spd verify 50 --port COM4 --in my_module.bin
Unified-DDR-Flasher.exe spd fix-crc 50 --port COM4
Unified-DDR-Flasher.exe spd hub-reg get 50 MR11 --port COM4
Unified-DDR-Flasher.exe spd pswp get 50 --port COM4
Unified-DDR-Flasher.exe pmic measure 48 --port COM4 --output-format json
Unified-DDR-Flasher.exe pmic toggle-vreg 48 --port COM4
Unified-DDR-Flasher.exe pmic unlock 48 --port COM4
Unified-DDR-Flasher.exe pmic change-password 48 73 94 AA BB --port COM4
Unified-DDR-Flasher.exe pmic pgood-pin --port COM4
Unified-DDR-Flasher.exe eeprom read 0 16 --port COM4 --output-format hex

Auto-detect

Use --auto-detect to skip --port; the tool walks COM ports and uses the first one that responds to a ping.

Unified-DDR-Flasher.exe ping --auto-detect

Reconnect on USB fault

For scripted long operations over marginal cables:

Unified-DDR-Flasher.exe spd write 50 --port COM4 --in dump.bin --reconnect-timeout 30

If the USB connection drops mid-command, the tool waits up to 30 s for the port to reappear before failing.

Exit codes

Code	Meaning
0	Success
1	Device not found / ping failed
2	I2C / SPD error
3	Verification failed
4	CRC error
5	Write error
6	Usage / argument error

Unified-DDR-Flasher.exe spd verify 50 --port COM4 --in golden.bin --quiet
if errorlevel 3 echo Module differs from golden image

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Settings

Settings are stored in %LOCALAPPDATA%\UnifiedDDRFlasher\settings.json:

• AutoConnect — if true, the GUI tries to reconnect to the last used port on startup.
• LastPort — last successfully connected COM port.
• PmicPasswords — per-PMIC-type vendor unlock passwords (LSB + MSB bytes). Falls back to the JEDEC default (0x73, 0x94) when no type-specific password is stored.

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Building from Source

Open UDF.sln in Visual Studio 2019+ with the .NET Framework 4.8.1 SDK installed. The solution contains two projects:

• UDF-Core — the protocol-only DLL (no UI dependencies). Source is private; the compiled UDF-Core.dll is committed to lib/prebuilt/.
• Unified-DDR-Flasher — the WinForms application, references the library through a configurable path.

One-time setup

1. Build (or obtain) UDF-Core.dll — e.g. C:\dev\udf-private\UDF-Core.dll.

2. Tell the build where it is. Pick one of:

   • Per-repo file (recommended): copy src\UDFCore.local.props.example to src\UDFCore.local.props and edit <UDFCoreLibraryPath>. The file is gitignored.
   • Environment variable:

     setx UDFCoreLibraryPath "C:\dev\udf-private\UDF-Core.dll"
     

   • Command-line override:

     msbuild src\Unified-DDR-Flasher.csproj ^
             /p:Configuration=Release ^
             /p:UDFCoreLibraryPath=C:\dev\udf-private\UDF-Core.dll
     

3. Restore NuGet packages:

   nuget restore UDF.sln
   

Build

msbuild src\Unified-DDR-Flasher.csproj /p:Configuration=Release

Single-file output

The release build produces a self-contained executable. All referenced libraries — UDF-Core.dll, Newtonsoft.Json.dll, System.Text.Json.dll, and every transitive dependency — are embedded as compressed resources inside Unified-DDR-Flasher.exe by Costura.Fody. Ship just two files:

Unified-DDR-Flasher.exe
Unified-DDR-Flasher.exe.config

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Troubleshooting

"Device on COMx did not respond to CMD_PING after 5 attempts"

1. Firmware is flashed (device should enumerate as a CDC serial port — if it shows as RPI-RP2, drag UDF_fw.uf2 onto it).
2. No other software has the port open (PuTTY, another instance).
3. The cable supports data, not just power.

"Firmware returned UNKNOWN (0x3F)"

The firmware predates this host build. Reflash with the matching UDF_fw.uf2.

I2C / SPD errors on marginal socket contact

The firmware and host library both implement automatic I2C clock fallback (400 kHz → 100 kHz) and a single-retry after any transport fault. If errors persist, try cleaning the DIMM gold contacts and reseating.

"CRC FAIL" on a freshly-read module

Either the module has been XMP/EXPO-modified (vendor CRC rules differ from JEDEC's) or the SPD is genuinely corrupt. Use Recalc & Fix CRC if the timings themselves are valid.

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License

Application source (src/): MIT License.
Firmware (fw/) and core library (lib/): Proprietary — pre-built binaries only; source not published.