SG116j install crashed

Hi, all

I've bought Biccamera's original bland note PC (SG116j)
impulsively because of cheapness($1780). I've installed
12.0-CURRENT(r327788) right away. Booted smoothly but set
loader conf "unset hint.uart.1.at" and configure disk with

mmcsd0		58 GB	GPT
  mmcsd0p1	200MB	efi
  mmcsd0p2	54 GB	freebsd-ufs	/
  mmcsd0p3	4.2 GB	freebsd-swap	none

But in "Tetching distribution files" of base.txz, crashed
with:

sdhci_acpi0-slot0: Controller timeout
sdhci_acpi0-slot0: ============== REGISTER DUMP ==============
sdhci_acpi0-slot0: Sys addr: 0x02158000 | Version:  0x00001002
sdhci_acpi0-slot0: Blk size: 0x00000200 | Blk cnt:  0x000000f8
sdhci_acpi0-slot0: Argument: 0x017f57e8 | Trn mode: 0x00000027
sdhci_acpi0-slot0: Present:  0x1fff0106 | Host ctl: 0x00001025
sdhci_acpi0-slot0: Power:    0x0000000b | Blk gap:  0x00000080
sdhci_acpi0-slot0: Wake-up:  0x00000000 | Clock:    0x00000007
sdhci_acpi0-slot0: Timeout:  0x00000007 | Int stat: 0x00000001
sdhci_acpi0-slot0: Int enab: 0x05ff0033 | Sig enab: 0x05ff003a
sdhci_acpi0-slot0: AC12 err: 0x80000000 | Host ctl2:0x0000008b
sdhci_acpi0-slot0: Caps:     0x446cc8b2 | Caps2:    0x00000807
sdhci_acpi0-slot0: Max curr: 0x00000000 | ADMA err: 0x00000000
sdhci_acpi0-slot0: ADMA addr:0x00000000 | Slot int: 0x00000000
sdhci_acpi0-slot0: ===========================================
mmcsd0: Error indicated: 1 Timeout
  :
(snip)
  :
Stopped at     kdb_enter+0x3b: movq    $0,kdb_why
db>

Detail log has put in [1]. BTW I used [2] so all stuffs are
within it and it should not be fetched to internet.

Is there any idea to go forth?

Best regards.

[1] http://35.200.82.201/~kiri/freebsd/sg116j/crash_in_install.jpeg
[2] FreeBSD-12.0-CURRENT-amd64-20180110-r327788-memstick.img

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KIRIYAMA Kazuhiko