From: Eric Anholt <eric@anholt.net>
To: Arnd Bergmann <arnd@arndb.de>, Alexander Aring <alex.aring@gmail.com>
Cc: linux-rpi-kernel@lists.infradead.org, Mark Rutland <mark.rutland@arm.com>,
        devicetree@vger.kernel.org,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Scott Branden <sbranden@broadcom.com>,
        Marc Zyngier <marc.zyngier@arm.com>, Ray Jui <rjui@broadcom.com>,
        linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
        bcm-kernel-feedback-list@broadcom.com,
        Kumar Gala <galak@codeaurora.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 0/8] Raspberry Pi 2 support.
In-Reply-To: <201512222223.52449.arnd@arndb.de>
References: <1450310115-22163-1-git-send-email-eric@anholt.net> <201512220011.32234.arnd@arndb.de> <20151222142045.GA29335@omega> <201512222223.52449.arnd@arndb.de>
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Date: Thu, 24 Dec 2015 16:01:40 -0800
Message-ID: <87lh8jqtuj.fsf@eliezer.anholt.net>
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Arnd Bergmann <arnd@arndb.de> writes:

> On Tuesday 22 December 2015, Alexander Aring wrote:
>> Later while booting the kernel hangs forever, the solution on my side
>> was to enable:
>>=20
>> CONFIG_HAVE_ARM_ARCH_TIMER
>>=20
>> I think this doesn't use the BCM2835 timer anymore and some cortex-a7
>> related "generic timer", or?
>
> Right, but I don't see how that relates to the irqchip. Is the BCM2835 ti=
mer
> connected to a secondary irqchip, while the arch timer connects to the pr=
imary GIC?

The 2835 timer is a "peripheral", and connects to the second level
irqchip, while the arm arch timer can give us per-cpu interrupts in the
first level controller.

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