kcxt

kgdb notes

Kernel config

CONFIG_KGDB=y
CONFIG_KGDB_KDB=y
CONFIG_PANIC_TIMEOUT=y
CONFIG_PANIC_ON_OOPS=y
CONFIG_RANDOMIZE_BASE=n # Disable KASLR

kcxt

[    0.000000] c0      0 Booting Linux on physical CPU 0x0
[    0.000000] c0      0 Linux version 4.9.270-g862f51bac900-ab7613625 (android-build@abfarm-east4-101) (Android (7284624, based on r416183b) clang version 12.0.5 (https://android.googlesource.com/toolchain/llvm-project c935d99d7cf2016289302412d708641d52d2f7ee)) #0 SMP PREEMPT Thu Aug 5 07:04:42 UTC 2021
[    0.000000] c0      0 Boot CPU: AArch64 Processor [517f803c]
[    0.000000] c0      0 Machine: Google Inc. MSM sdm845 B1 DVT1.1
[    0.000000] c0      0 earlycon: msm_geni_serial0 at MMIO 0x0000000000a84000 (options '')
[    0.000000] c0      0 bootconsole [msm_geni_serial0] enabled
[    0.000000] c0      0 Reserved memory: created CMA memory pool at 0x00000000fec00000, size 16 MiB
[    0.000000] c0      0 OF: reserved mem: initialized node adsp_region, compatible id shared-dma-pool
[    0.000000] c0      0 Reserved memory: created CMA memory pool at 0x00000000fdc00000, size 16 MiB
[    0.000000] c0      0 OF: reserved mem: initialized node qseecom

kcxt

SMB2 DEBUG: (addr = CHGR_BASE, val = 0x00)
SMB2 DEBUG: (addr = 0x1001, val = 0x00)
SMB2 DEBUG: (addr = 0x1002, val = 0x00)
SMB2 DEBUG: (addr = 0x1003, val = 0x00)
SMB2 DEBUG: (addr = 0x1004, val = 0x02)
SMB2 DEBUG: (addr = 0x1005, val = 0x61)
SMB2 DEBUG: (addr = BATTERY_CHARGER_STATUS_1_REG, val = 0x03)
SMB2 DEBUG: (addr = BATTERY_CHARGER_STATUS_2_REG, val = INPUT_CURRENT_LIMITED_BIT)
SMB2 DEBUG: (addr = CHG_OPTION_REG, val = 0x00)
SMB2 DEBUG: (addr = BATTERY_CHARGER_STATUS_3_REG, val = FV_POST_JEITA_MASK=0x7a)

kcxt

Qcom (sdm845) audio

db410c notes

From 96boards docsdragonboard/dragonboard410c/guides/enable-ls-i2s.md.html

• Primary MI2S - Supports only playback
• Secondary MI2S - Supports only playback
• Tertiary MI2S - Supports only capture

kcxt

#!/bin/bash

# sudo uhubctl -a off -p 2 -n 2109:2812 && printf "%b" "\0x01" > /dev/ttyACM0 && sleep 15 && sudo uhubctl -a on -p 2 -n 2109:2812

export TOOLSDIR=$HOME/pmos/tools

. $HOME/pmos/tools/pmenv
. $HOME/pmos/tools/automation.sh
. ~/pmos/pmbootstrap/helpers/envkernel.sh

kcxt

#!/usr/bin/zsh
# Wrapper for common fastboot flash commands

# Example usage (as an alias)
# Assumes the device is running Android, syncs kernel modules (and whatever else)
# and then reboots and flashes the kernel
# $ alias aflashboot="adb remount && adb sync; aflash.sh -t -b"
#
# Flashes everything, from bootloader
# $ alias aflashall="aflash.sh -t -s -v -b"

kcxt

Writing a RIL HAL for AOSP / mainline

References

• How to step by step set up a data connection over QMI
  • Uses QMI USB modem, probably quite similar for us - but over QRTR instead of USB
• An introduction to libqmi
  • QMI is based on "services" which provide different functionality
• Introduction to ModemManager
  • Nice PDF explaining how the pieces go together.

kcxt

#!/bin/ash

# You may need to disable nftables for this to work, it's probably a bad idea to do so

sysctl net.ipv4.ip_forward=1
iptables -P FORWARD ACCEPT
iptables -A POSTROUTING -t nat -j MASQUERADE -s 192.168.250.0/24

echo "ip route add default via 192.168.250.1 dev eth0; setprop net.dns1 1.1.1.1" | waydroid shell

kcxt

#!/usr/bin/python3

import argparse
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as patches
from scipy.stats import linregress

pmics = ["pmi8998", "pm660"]
fabs = ["gf", "tsmc", "smic", "mgna"]

kcxt

#!/bin/bash

##############
## WARNING: This script uses `rm -rf` with variables, make sure you know what it's doing before running it
## and don't hold me accountable if you accidentally delete important stuff.
## Whilst I have tested it, your setup will be different and you should edit this to match.
## See more details at the bottom.

ANDROID_MAINLINE_DIR="/PATH/TO/AOSP/SOURCE"