From 5d2ed54d26e293a5eea870d9458e36d0d02083fb Mon Sep 17 00:00:00 2001
From: fangpeina <fangpeina@xiaomi.com>
Date: Sat, 29 Aug 2026 00:41:05 +0800
Subject: [PATCH] Documentation/applications/system/fastboot: add
 multi-transport info

Add Transports section describing USB, TCP, and Serial backends
with host-side command syntax. Update Prepare section to reference
per-transport Kconfig options.

Signed-off-by: fangpeina <fangpeina@xiaomi.com>
---
 .../applications/system/fastboot/index.rst        | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/Documentation/applications/system/fastboot/index.rst b/Documentation/applications/system/fastboot/index.rst
index 30f937a3e44..67bd09e97f7 100644
--- a/Documentation/applications/system/fastboot/index.rst
+++ b/Documentation/applications/system/fastboot/index.rst
@@ -6,9 +6,19 @@ Prepare
 
 - Check fastboot tool(Host): :code:`fastboot --version`
 - Download fastboot tool and install(Host): `platform-tools <https://developer.android.com/tools/releases/platform-tools>`__
-- Enable the fastbootd application(Device): :code:`CONFIG_USBFASTBOOT=y` and :code:`CONFIG_SYSTEM_FASTBOOTD=y`
+- Enable the fastbootd application(Device): :code:`CONFIG_SYSTEM_FASTBOOTD=y`
+- Enable at least one transport: USB (:code:`CONFIG_SYSTEM_FASTBOOTD_USB=y`), TCP (:code:`CONFIG_SYSTEM_FASTBOOTD_TCP=y`), or Serial (:code:`CONFIG_SYSTEM_FASTBOOTD_SERIAL=y`)
 - Start fastbootd(Device): :code:`fastbootd &`
 
+Transports
+==========================
+
+The fastboot daemon supports multiple transport backends concurrently. Each transport can be individually enabled via Kconfig.
+
+- **USB**: Native USB fastboot protocol. Requires :code:`CONFIG_USBFASTBOOT=y`. Host: :code:`fastboot -s <SN> <command>` or just :code:`fastboot <command>`
+- **TCP**: Fastboot TCP v1 protocol on port 5554. Requires :code:`CONFIG_NET_TCP=y`. Host: :code:`fastboot -s tcp:<device-ip>[:port] <command>`
+- **Serial**: UART transport using TCP v1 wire framing. Use ``socat`` on the host to bridge the serial port to a TCP socket. Host: :code:`fastboot -s tcp:<host>:<socat-port> <command>`
+
 Commands
 ==========================
 - :code:`fastboot reboot [FLAG]`: Reboot the device, more details for :code:`[FLAG]`: `g_resetflag <https://github.com/apache/nuttx-apps/blob/master/nshlib/nsh_syscmds.c#L114>`__ and `boardioc_softreset_subreason_e <https://github.com/apache/nuttx/blob/master/include/sys/boardctl.h#L458>`__
@@ -31,6 +41,7 @@ Examples
 - Exit fastboot mode: :code:`fastboot reboot`
 - Flash app.bin to partition /dev/app: :code:`fastboot flash app ./app.bin`
 - Erase partition /dev/userdata: :code:`fastboot erase userdata`
-- Dump partition /dev/app: :code:`fastboot filedump /dev/app` and then :code:`fastboot get_staged ./dump_app.bin`
+- Dump partition /dev/app: :code:`fastboot oem filedump /dev/app` and then :code:`fastboot get_staged ./dump_app.bin`
 - Dump memory from 0x44000000 to 0x440b6c00: :code:`fastboot oem memdump 0x44000000 0xb6c00` and then :code:`fastboot get_staged ./mem_44000000_440b6c00.bin`
 - Create RAM disk "/dev/ram10" of size 320KB: :code:`fastboot oem shell "mkrd -m 10 -s 512 640"`
+- Serial transport via socat: :code:`sudo socat -t 0 PTY,link=/dev/ttyFB,raw,echo=0 TCP-LISTEN:5556,reuseaddr,fork,nodelay &` then :code:`fastboot -s tcp:127.0.0.1:5556 getvar version`