sahara-mcp

A native Python MCP server for the Qualcomm Sahara protocol — the emergency-download boot protocol used by Qualcomm SoCs. It lets LLM agents talk directly to an EDL device over USB: enumerate devices, handshake, query the SoC identity, upload a Firehose programmer, run command-mode client commands, and reset the device.

No GPL code. The wire format is implemented from the publicly documented protocol facts in linux-msm/qdl (BSD-3-Clause). bkerler/edl was consulted only as a behavioural reference and is not imported, linked, or copied.

Use at your own risk. This talks to your phone's low-level bootloader on the EDL (9008) interface. Badly placed wires, wrong images, or power loss while flashing can brick a device. You have been warned.

Features

• sahara_list_devices — enumerate Qualcomm EDL devices on USB

• sahara_handshake — perform the HELLO exchange, report protocol version and device mode

• sahara_chipinfo — read serial, msm_id / oem_id / model_id (hw id), and OEM public-key hash

• sahara_upload — serve image(s) (typically a Firehose programmer as image id 0) in Sahara image-transfer mode

• sahara_execute — run a single command-mode client command (serial, msm_hw_id, oem_pk_hash, chip_id_v3, or a raw number)

• sahara_reset — reset the device over Sahara

Related MCP server: Arduino MCP Server (Simple)

Requirements

• Python 3.8+

• Windows/macOS/Linux with access to the device's EDL USB interface

• A libusb backend for pyusb

Windows driver note

The EDL interface must use WinUSB (via libusb), not the default Qualcomm driver. Use Zadig to replace the driver on the 05C6/9008 device before pointing pyusb at it.

Install

pip install -e .

This pulls in mcp, pyusb, and (on Windows) libusb wheels.

Usage

Start the MCP server and point an MCP client (e.g. opencode, Claude Desktop) at it:

python -m sahara_mcp_server      # stdio transport

Example tool call — upload a Firehose programmer and identify the SoC:

sahara_upload(index=0, images="0:C:\\firmware\\prog_firehose_ddr.elf")
sahara_chipinfo(index=0)

How it works

The Sahara protocol is a simple request/response stream over one bulk IN and one bulk OUT endpoint. On entry the device sends a HELLO; the host replies with HELLO_RESP choosing a mode (IMAGE_TX_PENDING for image transfers, COMMAND for client commands). This package implements the packet framing, the known command ids (READ_DATA, READ_DATA64, END_OF_IMAGE, DONE, SWITCH_MODE, EXECUTE, RESET, …), and the well-known quirks (MSM8916 EDL reporting an incomplete DONE, QUD devices that swallow the first HELLO).

Protocol reference

• linux-msm/qdl — src/sahara.c (BSD-3-Clause) — primary protocol reference, credited per its license.

• bkerler/edl (GPL-3.0) — consulted for behaviour; not imported. If you need a full-featured flashing tool, consider using it directly instead.

License

GPL-3.0. Protocol facts derived from linux-msm/qdl (BSD-3-Clause, Linaro Ltd / Qualcomm referents in that project's headers); all code here is original. Copyright (c) 2026 libertyrights.