Add configuration notes and driver notes

interesting_files.md

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+# Downstream Kernel samsung-serranolte
+
+Samsung Galaxy S4 Mini LTE based on MSM8930 SoC
+
+## Kernel Config
+
+KConfig path: `arch/arm/mach-msm/Kconfig`
+Related Makefiles: `arch/arm/mach-msm/Makefile` and `arch/arm/mach-msm/Makefile.boot`
+
+## Some config values
+
+### `MACH_SERRANO_EUR_LTE`
+
+Which depends on:
+`MACH_SERRANO`
+
+Referenced in:
+
+#### `arch/arm/mach-msm/board-8930-input-mxt.c:811`
+
+Specific function `static void mxts_power_onoff(int onoff)`
+
+#### `arch/arm/mach-msm/board-8930-pmic.c`
+
+Line 195: `/* Initial PM8917 MPP configurations */`
+
+Line 359: `extern void tsu6721_monitor(void);`
+called by `static void sec_bat_monitor_additional_check(void)`
+referenced inside `struct pm8921_sec_battery_data pm8921_battery_pdata`
+referenced inside `struct pm8921_charger_platform_data pm8921_chg_pdata`
+
+### `MACH_SERRANO`
+
+Which depends on:
+`ARCH_MSM8930`
+
+Referenced in:
+
+#### `arch/arm/mach-msm/board-8930-input-mxt.c:610`
+
+Specific function `static void mxts_power_onoff(int onoff)`
+
+### `ARCH_MSM8930`
+
+Which depends on:
+```
+ARCH_MSM_KRAITMP
+ARM_GIC
+CPU_V7
+GPIO_MSM_V2
+MSM_GPIOMUX
+MSM_SCM if SMP
+MSM_DIRECT_SCLK_ACCESS
+REGULATOR
+MSM_RPM_REGULATOR
+MSM_RPM
+MSM_XO
+MSM_QDSP6_APR
+MSM_QDSP6_CODECS
+MSM_PIL
+MSM_AUDIO_QDSP6 if SND_SOC
+CPU_HAS_L2_PMU
+MSM_SPM_V2
+MSM_L2_SPM
+MSM_NATIVE_RESTART
+DONT_MAP_HOLE_AFTER_MEMBANK0
+MSM_REMOTE_SPINLOCK_SFPB
+ARCH_HAS_HOLES_MEMORYMODEL
+MULTI_IRQ_HANDLER
+MSM_PM8X60 if PM
+HOLES_IN_ZONE if SPARSEMEM
+ARM_HAS_SG_CHAIN
+MSM_KRAIT_WFE_FIXUP
+MSM_IOMMU_GPU_SYNC
+MSM_CPU_PWRCTL
+HAS_MACH_MEMUTILS
+GENERIC_TIME_VSYSCALL
+```
+
+TODO: check which of these configs are already mainlined

kernel_config.txt

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+#
+# Config
+# TODO: explain better
+#
+
+# OpenRC logging
+Edit /etc/rc.conf
+
+rc_logger="YES"
+#rc_log_path="/var/log/rc.log"
+
+
+
+#
+# OLD KERNEL
+#
+
+# Disable 3D driver
+CONFIG_MSM_KGSL=n
+
+# Enable netconsole
+CONFIG_NETCONSOLE=y
+CONFIG_USB_ETH=y # This forces USB to network mode in early boot
+- Then add to deviceinfo file: "netconsole=@/usb0,172,16.42.2@6666"
+
+# ???
+CONFIG_BATTERY_SAMSUNG=n # Maybe enable?
+
+# Fix assembler junk: proc-v7.S:346 replace #alloc #execinstr with "ax"
+
+# Fix undefined reference to 'fm_smd_enable'
+CONFIG_RADIO_IRIS=n
+Maybe an alternatice could be CONFIG_RADIO_IRIS_TRANSPORT=y instead of separate module
+
+# Disable camera driver
+CONFIG_MSM_CAMERA=n
+CONFIG_MSM_EEPROM=n
+CONFIG_MSM_ACTUATOR=n
+CONFIG_MSM_CAMERA_SENSOR=n
+CONFIG_MSM_CAMERA_FLASH=n
+CONFIG_MSM_VCAP=n
+CONFIG_MSM_VPE=n
+
+# Disable Video Core Driver
+CONFIG_MSM_VIDC=n
+
+# Enable Framebuffer Console (fbcon) and add one font
+CONFIG_FRAMEBUFFER_CONSOLE=y
+CONFIG_FONT_8x16=y
+
+
+#
+# NEW KERNEL 18.1
+#
+
+# apply pmOS patches 01, 02, 03
+# apply my patches 0001,0002,0003
+
+# sdFAT errors -> disable it
+CONFIG_SDFAT_FS=n
+
+# Radio IRIS link errors -> compile statically instead of module
+CONFIG_RADIO_IRIS=y
+CONFIG_RADIO_IRIS_TRANSPORT=y
+
+# Netlink link errors:
+NETFILTER_NETLINK_QUEUE_CT=y