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 10:30:07 -0600 Message-ID: <5764258F.3060207@wwwdotorg.org> References: <20160612034541.GA31426@jirafa.cyrius.com> <20160616161611.GC19360@ulmo.ba.sec> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160616161611.GC19360-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Thierry Reding , Martin Michlmayr Cc: Tomeu Vizoso , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Stephen Warren List-Id: linux-tegra@vger.kernel.org On 06/16/2016 10:16 AM, Thierry Reding wrote: > On Sat, Jun 11, 2016 at 08:45:41PM -0700, Martin Michlmayr wrote: >> 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). >> >> The hang does not occur when I disable tegra-devfreq or when I use >> tegra-devfreq in combination with u-boot 2016.03 (from DENX upstream, >> built by Debian). >> >> Steps to reproduce: >> >> ARCH=arm make multi_v7_defconfig >> Set CONFIG_ARM_TEGRA_DEVFREQ=y >> Boot from an external SD card and it will hang when/before mounting the >> SD card. > > Stephen, any ideas what might be going on here? I can't think of anything obvious, and the commit history of the L4T U-Boot is constructed in such a way that's it's essentially impossible to follow, so I can't easily tell what changes exist in the L4T U-Boot release that weren't upstream or vice-versa. If simply using mainline U-Boot works and is an option for you, I'd suggest that.