Raspberry Pi B stuck during boot?

[René Ladan]

On 08-08-16 17:38, René Ladan wrote:
> 2016-08-07 22:27 GMT+02:00 Tim Kientzle <tim at kientzle.com>:
>>
>>> On Aug 7, 2016, at 3:04 PM, René Ladan <rene at FreeBSD.org> wrote:
>>>
>>> On 07-08-16 13:57, Bernd Walter wrote:
>>>> On Sun, Aug 07, 2016 at 12:09:08PM +0200, René Ladan wrote:
>>>>> On 06-08-16 16:23, Bernd Walter wrote:
>>>>>> On Sat, Aug 06, 2016 at 03:06:20PM +0200, René Ladan wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> With recent versions of 11 (alpha3 and beta3) my raspberry b gets stuck
>>>>>>> near the end of the boot. I checked the SD card and updated it to 11-beta3
>>>>>>> using these commands (if I remember correctly, but nothing unusual):
>>>>>>>
>>>>>>> % make buildworld TARGET=arm TARGET_ARCH=armv6
>>>>>>> % make buildkernel KERNCONF=RPI-B TARGET=arm TARGET_ARCH=armv6
>>>>>>> # make installworld TARGET=arm TARGET_ARCH=armv6 DESTDIR=/mnt
>>>>>>> # make installkernel TARGET=arm TARGET_ARCH=armv6 DESTDIR=/mnt
>>>>>>> KERNCONF=RPI-B
>>>>>>> # make delete-old TARGET=arm TARGET_ARCH=armv6 DESTDIR=/mnt
>>>>>>> # make delete-old-libs TARGET=arm TARGET_ARCH=armv6 DESTDIR=/mnt
>>>>>>> # mergemaster -A armv6 -D /mnt -p
>>>>>>> # mergemaster -A armv6 -D /mnt -U -i
>>>>>>>
>>>>>>> See https://rene-ladan.nl/IMG_20160804_193031.jpg for a phone picture of
>>>>>>> the TV screen where it gets stuck.
>>>>>>>
>>>>>>> Any ideas if what could be wrong?
>>>>>> It might be hanging in single user mode prompt on serial console.
>>>>>>
>>>>> So if I would disable serial console in /etc/ttys it should be fine?
>>>> No - that is just for the login prompt after the OS has been booted into
>>>> multiuser mode.
>>>> Unfortunately I have no idea where the loader on an RPi gets that
>>>> information from, since so far I've always used serial consoles.
>>>> The kernel itself can do double output, but the rc-scripts, including
>>>> the single user mode prompt, are limited to one.
>>>> It would be easiest if you have the option to wire up the serial console.
>>> Yeah, I'll see if I can construct something using the GPIO pins.
>>>
>>> I also tried adding autoboot_delay=-1 to /boot/loader.conf and pulling
>>> my DCF77 receiver from the GPIO pins (ground, +3.3V, signal wire) but
>>> that didn't help either.
>>>
>>> So with USB power, HDMI cable to TV, and a USB keyboard it hangs
>>
>> Anyone doing “interesting” work with RPi should have at least one of these on hand:
>>
>>    http://adafru.it/954
>>
> Guess I was lucky enough until now to not need one. I ordered one, it
> should arrive tomorrow.
> 
I figured it out (with the Adafruit cable): I had an outdated NFS entry
in /etc/fstab which now pointed to nothing, and it is automatically
mounted so it runs before the login prompt and sshd. So that pretty much
disabled non-serial logins if I had the network cable connected.

The serial console gave enough information to fix the problem and to
restore /etc/ttys to the original settings.

Thanks,
René