evidence · 2.0 KiB

README.md

Committed at docs/evidence/keyboard-base/bus/README.md. This is what grounds the requirements that cite it.

Open raw source

Keyboard-base bus on the installed device tree (task 2.2; board-read)

The device tree carries the pinctrl states for IO42, IO43, IO46, IO47 and IO52, and hardware I2C4 at 0x91409000 (task 2.1). It went onto the board as part of the landscape boot bundles (deploy-bundle.sh, which copies the bundle’s DTB to /boot/k230-tdisplay.dtb), not with tools/push-file.py. The board has been running it since 2026-10-13. Host proof for 2.1: nix build .#deviceTreeMainlineDrm built /nix/store/y4j8bwc0…-k230-tdisplay-mainline-drm.dtb on 2026-10-14.

Board read, 2026-10-14T09:48:35-05:00, kernel 7.3.0-rc5, over SSH:

$ sha256sum /boot/k230-tdisplay.dtb
f108555a2d2040216e6c2a9f631f319c1edab7826c9600156db688023deb557f  /boot/k230-tdisplay.dtb
$ systemctl list-units "serial-getty@*" --no-legend
  serial-getty@ttyS0.service loaded active running Serial Getty on ttyS0
$ cat /sys/class/drm/card0-DSI-1/status
connected
$ grep -E "goodix|tca8418" /proc/interrupts
  86:       2471  gpio-k230     23 Level     goodix-berlin
  88:         20  gpio-k230     10 Level     tca8418
$ i2cdetect -y -r 1        # i2c-1 is the base's I2C4 adapter
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- UU -- -- -- 38 -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
70: -- -- -- -- -- -- -- --

Every address from probe 1.2 answers. UU marks an address whose driver is bound: 0x20 XL9555, 0x34 TCA8418, 0x55 BQ27220 gauge, 0x6b BQ25896 charger. 0x38 (LILYGO’s AHT20) answers with no driver. The serial getty is running. On the glass, the operator has used the panel and touch on this device tree throughout 2026-10-13/14 (landscape 8.6). This read did not log in on /dev/ttyACM0 itself; it shows the getty is active.