Stock image of armv7 RPI2 (r330034) hangs on loader after first boot, with red LED on.

[Hyun Hwang]

On Wednesday, February 28, 2018, 1:23 PM (UTC-0500), Hyun Hwang <hyun at caffeinated.codes> wrote:
> Hi,
> 
> I re-imaged my RPi 2 with [the stock image]
> (https://download.FreeBSD.org/ftp/snapshots/arm/armv7/ISO-IMAGES/12.0/FreeBSD-12.0-CURRENT-arm-armv7-RPI2-20180226-r330034.img.xz), 
> but it hangs on second boot on the loader.
> 
> First boot shows no problem at all. Loader finds the kernel, loads the 
> dtb, and hands over to the kernel. Then kernel clears the screen and 
> starts normal boot procedure.
> The problem occurs on the second boot. I first shut the pi down using 
> `shutdown -h now`, unplugged it, and then immediately re-plugged to the 
> power.
> 
> This is what the screen reads:
> ```
> Hit [Enter] to boot immediately, or any key for command prompt.
> Booting [/boot/kernel/kernel]...
> /boot/dtb/bcm2836-rpi-2-b.dtb size=0x34cd
> Loaded DTB from file 'bcm2836-rpi-2-b.dtb'.
> Kernel entry at 0x1200100...
> Kernel args: (null)
> ```
> At this point, it does nothing.
> 
> I have found that the very problem occurred [a month ago to bob]
> (https://lists.freebsd.org/pipermail/freebsd-arm/2018-January/017310.html), 
> but unlike their situation (self-built), this occurs on stock image.
> 
> Can anyone look into this problem? In the meantime, I will try few other 
> previous images that is still in download.FreeBSD.org.
> 
> Thank you.
> -- 
> Hyun Hwang

I just checked stock image at r329009, and it boots fines even after the first boot.
So some commit after r329009 is causing behavior, but frankly, I have no idea where to start looking, since this weird hang does not print any detailed message out even if I set `verbose_loading="YES"` and `boot_verbose="YES"` in `/boot/loader.conf.local`. It just sits there and do nothing after that `Kernel args: (null)` line.

Any lead is appreciated.
-- 
Hyun Hwang