From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: tegra-devfreq hangs TK1 with R21.4 u-boot Date: Fri, 17 Jun 2016 10:17:30 -0600 Message-ID: <5764229A.2000702@wwwdotorg.org> References: <20160612034541.GA31426@jirafa.cyrius.com> <20160612173106.GA31522@jirafa.cyrius.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160612173106.GA31522-IRMp5PtgtdoigzW5ZibpNwC/G2K4zDHf@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Martin Michlmayr Cc: Shreshtha , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org On 06/12/2016 11:31 AM, Martin Michlmayr wrote: > * Shreshtha [2016-06-12 17:15]: >>> I noticed that the Jetson TK1 hangs during boot (when/before mounting >>> the SD disk) when CONFIG_ARM_TEGRA_DEVFREQ=y is set and when u-boot >>> from R21.4 is used (2014.10-rc2). >> >> I cannot find CONFIG_ARM_TEGRA_DEVFREQ in r21.4 codeline. With default >> "tegra12_defconfig", CONFIG_PM_DEVFREQ is getting enabled. >> >> Can you please share some more details about CONFIG_ARM_TEGRA_DEVFREQ, which >> file it complies and if it is really present in code or pulled from other git. > > Sorry for not being clear. I'm talking about the mainline kernel from > kernel.org: > drivers/devfreq/Makefile:obj-$(CONFIG_ARM_TEGRA_DEVFREQ) += tegra-devfreq.o > > Booting a mainline kernel with tegra-devfreq enabled will hang my machine > during bootup when I use the u-boot from R21.4 (which I believe is the > latest provided by NVIDIA). Note that if you're booting a mainline kernel, there's no need to use the L4T U-Boot release; a mainline U-Boot release should work just fine. Or put another way, the "latest provided by NVIDIA" is actually mainline U-Boot, unless you need to boot a downstream L4T kernel which has some downstream-specific requirements.