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uzbek-plus/logs/b9/b9l/B9L-0-RESULT.md
q 4a7224c41f B9: built-in display (ST7735S SPI) in Linux and persistent B9C cache 
- B9A: read-only audit of stock LK/DT: the panel is an ST7735S 128x128 on SPI (BLSP1 QUP4,
  16 MHz, mode 3, D/C GPIO116, RESET GPIO118), backlight = PM8916 MPP4 current sink 40 mA.
- B9B: upstream panel-mipi-dbi with the stock init sequence as firmware; MPP4 sink via pinctrl
  + gpio-backlight; first light with correct colours/orientation/offsets.
- B9C: fbcon (6x8, 21x16) on tty1 + getty, UART console kept, aurora-display service;
  cache B9C b9ce13c9 written and verified, cold boots with LTE + Wi-Fi + display.
- B9L (RAM only): lk2nd second stage with an msm8916 SPI panel port shows a picture before Linux.
- Sanitizer: whitelist for b8/ and b9/.
2026-10-03 01:45:02 +03:00

1.1 KiB
Raw Blame History

B9L-0 — lk1st chainloads an unmodified 32-bit lk2nd 23.1 (RAM only) — PASS (2026-10-03)

RESET-held power-on → lk1st fastboot (product lk1st-msm8916) → fastboot boot b9/b9l/lk2nd-23.1-stock.img (= lk2nd-build/out/lk2nd.img 555826ea, FORCE_FASTBOOT). Nothing written.

UART (l0/uart.log):

  • lk1st: [1360] fastboot: boot → booting linux @ 0x80008000, ramdisk @ 0x82000000 (1), tags/device tree @ 0x81e00000
  • 2nd LK: welcome to lk → lk2nd_init() → Booted @ 0x80008000, r0=0x0, r1=0x0, r2=0x81e00000 → Found valid DTB with 1867 bytes total → Command line from previous bootloader: lk2nd androidboot.emmc=true … → No continuous splash: MDP GDSC is not enabled → Fastboot mode was forced with compile-time flag. → fastboot: processing commands
  • host: fastboot getvar product → lk2nd-msm8916, kernel: lk.

=> A second-stage 32-bit LK runs on the migrated chain (DB410c TZ + qhypstub). Basis for B9L-RAM. (Driver note: the first identity probe after boot raced with lk1st still being enumerated; re-checked by hand.)