netdev - Re: [PATCH v5 net-next 5/5] net: wwan: t7xx: Devlink documentation

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Message-ID: <c9f0eca7-99e8-62a5-9790-1230c43e1817@linux.intel.com>
Date:   Wed, 25 Jan 2023 16:03:37 +0530
From:   "Kumar, M Chetan" <m.chetan.kumar@...ux.intel.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        johannes@...solutions.net, ryazanov.s.a@...il.com,
        loic.poulain@...aro.org, ilpo.jarvinen@...ux.intel.com,
        ricardo.martinez@...ux.intel.com,
        chiranjeevi.rapolu@...ux.intel.com, haijun.liu@...iatek.com,
        edumazet@...gle.com, pabeni@...hat.com,
        chandrashekar.devegowda@...el.com, linuxwwan@...el.com,
        linuxwwan_5g@...el.com, corbet@....net, linux-doc@...r.kernel.org,
        jiri@...dia.com
Subject: Re: [PATCH v5 net-next 5/5] net: wwan: t7xx: Devlink documentation

On 1/25/2023 10:21 AM, Jakub Kicinski wrote:
> On Sat, 21 Jan 2023 19:03:58 +0530 m.chetan.kumar@...ux.intel.com wrote:
>> +In fastboot mode the userspace application uses these commands for obtaining the
>> +current snapshot of second stage bootloader.
> 
> I don't know what fastboot is, and reading this doc I see it used in
> three forms:
>   - fastboot protocol
>   - fastboot mode
>   - fastboot command & response

The fastboot is sort of a tool. It implements the protocol for 
programming the device flash or getting device information. The device 
implements the fastboot commands and host issue those commands for 
programming the firmware to device flash or to obtain device 
information. Inorder to execute those commands, first the device needs 
to be put into fastboot mode.

More details on fastboot can be found in links [1].

> In the end - I have no idea what the devlink param you're adding does.

"fastboot" devlink param is used to put the device into fastboot mode
to program firmware to device flash or to obtain device information.


[1]
https://en.wikipedia.org/wiki/Fastboot
https://android.googlesource.com/platform/system/core/+/refs/heads/master/fastboot/README.md

-- 
Chetan