Re: tegra-devfreq hangs TK1 with R21.4 u-boot

Stephen Warren
2016-06-17T16:30:07Z

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.