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Linux_Drivers/u-boot-2021.10/doc/usage/reset.rst
sam.xiang f8fc109960 [uboot] create uboot from github:
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.. SPDX-License-Identifier: GPL-2.0+
reset command
=============
Synopsis
--------
::
reset [-w]
Description
-----------
Perform reset of the CPU. By default does COLD reset, which resets CPU,
DDR and peripherals, on some boards also resets external PMIC.
-w
Do warm WARM, reset CPU but keep peripheral/DDR/PMIC active.
Return value
------------
The return value $? is always set to 0 (true).