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From:   Loic Poulain <loic.poulain@linaro.org>
Date:   Tue, 30 Mar 2021 10:02:33 +0200
Message-ID: <CAMZdPi-biACwrE=jeFXqgkCAZ3YpX8+vzqEaB9CuyepbhiKb7A@mail.gmail.com>
Subject: Re: [PATCH v1 4/7] bus: mhi: core: Add support for Flash Programmer
 execution environment
To:     Bhaumik Bhatt <bbhatt@codeaurora.org>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        Hemant Kumar <hemantk@codeaurora.org>,
        Jeffrey Hugo <jhugo@codeaurora.org>,
        open list <linux-kernel@vger.kernel.org>,
        =?UTF-8?B?Q2FybCBZaW4o5q635byg5oiQKQ==?= <carl.yin@quectel.com>,
        Naveen Kumar <naveen.kumar@quectel.com>,
        abickett@codeaurora.org
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On Tue, 30 Mar 2021 at 03:28, Bhaumik Bhatt <bbhatt@codeaurora.org> wrote:
>
> From: Carl Yin <carl.yin@quectel.com>
>
> MHI WWAN modems support downloading firmware to NAND or eMMC
> using Firehose protocol with process as follows:
> 1. Modem boots up, enters AMSS execution environment and the
> device later enters EDL (Emergency Download) mode through any
> mechanism host can use such as a diag command.
> 2. Modem enters SYS_ERROR, MHI host handles SYS_ERROR transition.
> 3. EDL image for device to enter 'Flash Programmer' execution
> environment is then flashed via BHI interface from host.
> 4. Modem enters MHI READY -> M0 and sends the Flash Programmer
> execution environment change to host.
> 5. Following that, EDL/FIREHOSE channels (34, 35) are made
> available from the host.
> 6. User space tool for downloading firmware image to modem over
> the EDL channels using Firehose protocol. Link to USB flashing
> tool: https://git.linaro.org/landing-teams/working/qualcomm/qdl.git/
>
> Make the necessary changes to allow for this sequence to occur and
> allow using the Flash Programmer execution environment.
>
> Signed-off-by: Carl Yin <carl.yin@quectel.com>
> Co-developed-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
> Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>

Reviewed-by: Loic Poulain <loic.poulain@linaro.org>