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Date:   Thu, 22 Sep 2022 22:08:19 +0900
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Subject: Re: [PATCH v2] brcmfmac: Add support for BCM43596 PCIe Wi-Fi
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To:     Linus Walleij <linus.walleij@linaro.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>
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        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
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From:   Hector Martin <marcan@marcan.st>
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On 22/09/2022 22.02, Linus Walleij wrote:
> On Thu, Sep 22, 2022 at 12:21 PM Konrad Dybcio
> <konrad.dybcio@somainline.org> wrote:
> 
>> Also worth noting is the 'somc' bit, meaning there are probably *some* SONY
>> customizations, but that's also just a guess.
> 
> What I have seen from BRCM customizations on Samsung phones is that
> the per-device customization of firmware seems to involve the set-up of
> some GPIO and power management pins. For example if integrated with
> an SoC that has autonomous system resume, or if some GPIO line has
> to be pulled to enable an external regulator or PA.
> 
> To the best of my knowledge that customization is done by consultants
> from Broadcom when working with the device manufacturer, and
> eventually they roll a unique firmware for the device. Probably because
> the firmware can only be signed for execution by Broadcom?

I don't think the firmware is signed, they probably just don't want to
share the source code with most customers? (Except Apple maybe, but
Apple gets custom silicon too...).

- Hector