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Bug#827557: linux-image-4.6.0-1-armmp-lpae: 4.6 armmp kernel fails to boot on nvidia jetson (4.5 works)



Package: linux-image-4.6.0-1-armmp-lpae
Version: 4.6.1-1
Severity: normal

I installed an nvidia jetson board (armhf, v7) with the stretch alpha6
installer. It all worked nicely. 
See documentation at:
https://wiki.debian.org/InstallingDebianOn/NVIDIA/Jetson-TK1

On upgrading the kernel to 'current testing', (
linux-image-4.6.0-1-armmp-lpae 4.6.1-1, and linux-image-armmp-lpae
4.6+74, from what's in alpha6 installer (
linux-image-4.5.0-2-armmp-lpae 4.5.3-2 and linux-image-armmp-lpae
4.5+73) causes the machine to no longer boot.

I failed to keep a log, but after 
[    3.266688] mmc0: Unknown controller version (3). You may experience problems.
[    3.314162] mmc1: Unknown controller version (3). You may experience problems.
(which appears on successful boots too)
I just get messages about failing to set up IO for a sound device (3
lots), then it hangs. 
On the working 4.5 boot I see:
----------------
[   15.714061] r8169 0000:01:00.0: firmware: failed to load rtl_nic/rtl8168g-2.fw (-2)

Debian GNU/Linux stretch/sid debian-jetson ttyS0

debian-jetson login:
--------------

I tried to turn extra debug on and failed. 

I am about to go on hols for 3 weeks so filing this bug as a
placeholder in case anyone else has info to add.

Clearly further investigation is needed to find out where it is going
wrong.

-- System Information:
Debian Release: 8.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)


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