RPi3 boot failure with r325156 snapshot

[Hyun Hwang]

Hello,

I tried to boot RPi3 with -CURRENT snapshot (r325156), but it failed. I doubt this boot failure is related to the [issue](https://lists.freebsd.org/pipermail/freebsd-arm/2017-November/016986.html) discussed earlier in this list since it just gives up even before the kernel is loaded by the EFI loader (if I guessed it correctly). I tried all the available snapshots---r323985, r324306, r324542, and r324754---on the download server, but no success so far.
To see if this is caused by hardware problem I tried few tests on Raspbian Stretch and found out that the hardware is just fine.

Here is the entire log appeared on screen, in case anyone finds this helpful:
```
Net:   Net Initialization Skipped
No ethernet found.
starting USB...
USB0:   Core Release: 2.80a
Scanning bus 0 for devices... 4 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
       scanning usb for ethernet devices... 1 Ethernet Device(s) found
Hit any key to stop autoboot:  0
switch to partitions #0, OK
mmc0 is current devices
Scanning mmc 0:1...
Found EFI removable media binary efi/boot/bootaa64.efi
reading efi/boot/bootaa64.efi
82224 bytes read in 35 ms (2.2 MiB/s)
## Starting EFI application at 01000000 ...
Scanning disks on usb...
Scanning disks on mmc
Adding logical partition
Adding logical partition
MMC Device 1 not found
MMC Device 2 not found
MMC Device 3 not found
Found 7 disks
←[18t←[?25h←[2J
>> FreeBSD EFI boot block
   Loader path: /boot/loader.efi
   
   Initializing modules: ZFS UFS
   Loader path:
"Synchronous Abort" handler, esr 0x96000004
ELR:     3af62cec
LR:      3af61d60
x0 : 0000000000000000 x1 : 0000000000000000
x2 : 000000003afeb000 x3 : 0000000000000000
x4 : 000000003ab2eec0 x5 : 0000000000000000
x6 : 0000000000000015 x7 : 0000000000000000
x8 : 000000003af72eb0 x9 : 0000000000000000
x10: 0000000000000068 x11: 0000000000000040
x12: 0000000000000000 x13: 0000000000000000
x14: 0000000000000000 x15: 0000000000000000
x16: 0000000000000000 x17: 0000000000000000
x18: 000000003ab30df8 x19: 0000000000000000
x20: 0000000037a16008 x21: 000000003af86f74
x22: 0000000039b2ddd8 x23: 00000000000007d0
x24: 0000000039b2dde0 x25: 0000000039b2ddd0
x26: 000000003af83ac0 x27: 0000000039b1be1c
x28: 0000000039b2ddc8 x29: 000000003ab2ef60

Resetting CPU ...

resetting ...
```

In the meantime, I will try to build my own snapshot using r325364---mentioned [here](https://lists.freebsd.org/pipermail/freebsd-arm/2017-November/017000.html)---if it's possible to cross-build on i386.

Thank you.
--
Hyun Hwang