linux-kernel - Re: [PATCH v2 7/9] driver core: Set fw

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Date:   Tue, 28 Jun 2022 15:09:53 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Sascha Hauer <sha@...gutronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-gpio@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default

On Wed, Jun 22, 2022 at 9:40 PM Saravana Kannan <saravanak@...gle.com> wrote:

> Actually, why isn't earlyconsole being used? That doesn't get blocked
> on anything and the main point of that is to have console working from
> really early on.

For Arm (arch/arm) there is a special low-level debug option call low-level
debug, which you find in e.g:
arch/arm/Kconfig.debug
arch/arm/kernel/debug.S

This debug facility can print to the UART fifo before even MMU is up, pretty
much from the first instruction the kernel executes.

The versatility of LL-debug means that developers do not use earlyconsole
much on Arm.

I don't know about arm64 though.

Yours,
Linus Walleij