PineTab with Pinebook image at armbsd.org

[Takeshi Mutoh <takeshi.mutoh%gmail.com@localhost>]

Hi.
How can I run NetBSD on PineTab?

I'm trying to get PineTab ( https://wiki.pine64.org/wiki/PineTab ) to
work with a NetBSD image for Pinebook.
I'm currently using HEAD image 0.99.80 from armbsd.org.

During the boot process, the following message keeps repeating
forever, and I can't proceed from there.
[ 1.0000030] sunxitwi0: gttwsi_wait(): send-start timeout (polled),
control=0x70, error=35
The entire dmesg can be found at
https://dmesgd.nycbug.org/index.cgi?do=view&id=5971 .

I tried to copy DTB sun50i-a64-pinetab.dtb from Arch Linux, but the
same situation happened.

How do I modify the source so that I can proceed from here?

Thanks in advance.