[OnePlus 6T  ROMs, Kernels, Recoveries, & Other Dev] foobar66:
Not sure if this is any useful further. Bootloader log:

Format: Log Type - Time(microsec) - Message - Optional Info
Log Type: B - Since Boot(Power On Reset), D - Delta, S - Statistic
S - QC_IMAGE_VERSION_STRING=BOOT.XF.2.0-00364-SDM845LZB-1
S - IMAGE_VARIANT_STRING=SDM845LA
S - OEM_IMAGE_VERSION_STRING=ubuntu-214
S - Note XBL compiled at Dec 26 2018 19:57:06
S - Boot Interface: UFS
S - Secure Boot: On
S - Boot Config @ 0x00786070 = 0x000000c1
S - JTAG ID @ 0x00786130 = 0x2008b0e1
S - OEM ID @ 0x00786138 = 0x0051459b
S - Serial Number @ 0x00784138 = 0x33b9ddac
S - Feature Config Row 0 @ 0x007841a0 = 0x0050200080000400
S - Feature Config Row 1 @ 0x007841a8 = 0xe000000000000040
S - Core 0 Frequency, 1516 MHz
S - PBL Patch Ver: 1
S - PBL freq: 600 MHZ
B - 94 - PBL, Start
B - 5276 - bootable_media_detect_entry
B - 44218 - bootable_media_detect_success
B - 44592 - elf_loader_entry
B - 45168 - auth_hash_seg_entry
B - 52702 - auth_hash_seg_exit
B - 58723 - elf_segs_hash_verify_entry
B - 65491 - elf_segs_hash_verify_exit
B - 66121 - auth_xbl_sec_hash_seg_entry
B - 73329 - auth_xbl_sec_hash_seg_exit
B - 73330 - xbl_sec_segs_hash_verify_entry
B - 74083 - xbl_sec_segs_hash_verify_exit
B - 74109 - PBL, End
B - 88907 - SBL1, Start
B - 95983 - boot_flash_init, Start
D - 0 - boot_flash_init, Delta
B - 96014 - xblconfig_init, Start
D - 3843 - Auth Metadata
D - 98881 - xblconfig_init, Delta
B - 194895 - sbl1_ddr_set_default_params, Start
D - 1525 - sbl1_ddr_set_default_params, Delta
B - 196420 - boot_config_data_table_init, Start
B - 196542 - CDT not programmed, using default
D - 122 - boot_config_data_table_init, Delta - (54 Bytes)
B - 196572 - CDT Version:3,Platform ID:8,Major ID:1,Minor ID:0,Subtype:0
B - 196572 - pm_device_init, Start
B - 200659 - PM: PON REASON: PM0=0x8000028000000001:0x800040 PM1=0x8000088000000020:0x800 PM2=0x8000088000000020:0x800
B - 255163 - PM: SET_VAL:Skip
D - 59261 - pm_device_init, Delta
B - 255834 - pm_driver_init, Start
D - 5337 - pm_driver_init, Delta
B - 261293 - PM: Trigger FG IMA Reset
B - 261507 - PM: Trigger FG IMA Reset.Completed
B - 265411 - PM: [OnePlus]Print Oneplus ADC Config
B - 266021 - PM: Name=GPIO_08 adc= 1200 adc->id=4
B - 266631 - PM: Name=GPIO_09 adc= 163 adc->id=1
B - 267241 - PM: Name=GPIO_10 adc= 162 adc->id=1
B - 267851 - PM: Name=GPIO_11 adc= 449 adc->id=2
B - 268430 - PM: Name=GPIO_12 adc= 0 adc->id=0
B - 268430 - PM: hw_version = 41 name=UNKNOWN
B - 268461 - PM: rf_version = 12 name=UNKNOWN
B - 268461 - PM: init_a_board_version = 0 name=Unknown
B - 268461 - PM: enter console_loop time=268461

B - 868518 - PM: exit console_loop time=868518

B - 869494 - PM: set_fast_charge_current=500
B - 869524 - PM: set_pre_charge_current=250
B - 869555 - PM: set_float_volt_mv=4365
B - 869585 - PM: set_usbin_icl=2100
B - 870561 - PM: EntryVbat: 4041; EntrySOC: -1
B - 870561 - PM: ADSP result: 8
B - 870592 - PM: APSD in progress
B - 870805 - PM: pm_sbl_chg_post_init
B - 870805 - PM: hw_version = 41 name=UNKNOWN
B - 870805 - PM: get_hw_version: 41 set RF_CLK2 4X
B - 870836 - vsense_init, Start
D - 30 - vsense_init, Delta
B - 896974 - sbl1_ddr_set_params, Start
B - 898774 - Pre_DDR_clock_init, Start
D - 61 - Pre_DDR_clock_init, Delta
D - 1891 - sbl1_ddr_set_params, Delta
B - 898865 - sbl1_ddr_init, Start
D - 16134 - sbl1_ddr_init, Delta
B - 915030 - DSF version = 253.10, DSF SHRM version = 173.3
B - 915030 - Manufacturer ID = 1, Device Type = 7
B - 915061 - Rank 0 size = 4096 MB, Rank 1 size = 4096 MB
B - 915366 - do_ddr_training, Start
B - 916830 - Frequency = 1355 MHz
D - 1464 - do_ddr_training, Delta
B - 920154 - pImem Init Start
D - 9729 - pImem Init End, Delta
B - 931531 - clock_init, Start
D - 244 - clock_init, Delta
B - 931988 - Image Load, Start
D - 6741 - Auth Metadata
D - 244 - Segments hash check
D - 7961 - APDP Image Loaded, Delta - (7828 Bytes)
B - 940071 - usb: UFS Serial - 9591321c
B - 940101 - usb: fedl, vbus_low
B - 940650 - PM: 0: PON=0x1:HARD_RESET: ON=0x80:PON_SEQ: POFF=0x2:PS_HOLD: OFF=0x80:POFF_SEQ: FAULT1=0x40:UVLO: S3 RST=0x80:KPDPWR_ANDOR_RESIN
B - 940711 - PM: 1: PON=0x20:PON1: ON=0x80:PON_SEQ: POFF=0x8:GP1: OFF=0x80:POFF_SEQ: FAULT2=0x8:FAULT_N
B - 940742 - PM: 2: PON=0x20:PON1: ON=0x80:PON_SEQ: POFF=0x8:GP1: OFF=0x80:POFF_SEQ: FAULT2=0x8:FAULT_N
B - 940772 - PM: SMEM Chgr Info Write Success
B - 945439 - Image Load, Start
D - 3447 - Auth Metadata
D - 10095 - Segments hash check
D - 20770 - AOP Image Loaded, Delta - (178860 Bytes)
B - 966209 - Image Load, Start
D - 3477 - Auth Metadata
D - 274 - Segments hash check
D - 6070 - QSEE Dev Config Image Loaded, Delta - (34160 Bytes)
B - 972279 - Image Load, Start
D - 9973 - Auth Metadata
D - 10675 - Segments hash check
D - 43798 - QSEE Image Loaded, Delta - (2035400 Bytes)
B - 1016077 - Image Load, Start
D - 183 - SEC Image Loaded, Delta - (4096 Bytes)
B - 1016260 - Image Load, Start
D - 3446 - Auth Metadata
D - 2440 - Segments hash check
D - 13664 - QHEE Image Loaded, Delta - (379712 Bytes)
B - 1029924 - Image Load, Start
D - 0 - STI Image Loaded, Delta - (0 Bytes)
B - 1030168 - Image Load, Start
D - 3538 - Auth Metadata
D - 1007 - Segments hash check
D - 6740 - ABL Image Loaded, Delta - (203344 Bytes)
B - 1037030 - Image Load, Start
D - 3569 - Auth Metadata
D - 9150 - Segments hash check
D - 25559 - APPSBL Image Loaded, Delta - (2097152 Bytes)
B - 1099708 - success: 1; magic: ; addr: 0x5c00000
B - 1099738 - SBL1, End
D - 1010831 - SBL1, Delta
S - Flash Throughput, 118000 KB/s (5012926 Bytes, 42198 us)
S - DDR Frequency, 1353 MHz

UEFI Start [ 1447] SEC
ASLR : On
DEP : On
Timer Delta : +0 mS
RAM Entry 0 : Base 0x0000000080000000 Size 0x0000000100000000
RAM Entry 1 : Base 0x0000000180000000 Size 0x00000000FC8A0000
UEFI Ver : 5.0.181226.BOOT.XF.2.0-00364-SDM845LZB-1
Build Info : 64b Dec 26 2018 19:57:28
Boot Device : UFS
PROD Mode : TRUE
Retail : TRUE
PM0: 20, PM1: 21, PM2: 24,
PanelId--read the LCD register 0xDA the ID1 = :0x0000AD
PanelId--read the LCD register 0xDB the ID2 = :0x000011
PanelId--read the LCD register 0xDC the ID3 = :0x000001
PanelId:0xAD1101
DisplayDxe: Resolution 1080x2340 (1 intf)
-----------------------------
Platform Init [ 2322] BDS
qWrite addr:0x0 data:0x1
write addr:0x0 error
L:0x21 H:0x4
FG TYPE= 0x421
fg_type:0x421
HW_ID:41
BatteryNotMatch--- = 0
KeyPressed=2 Status=6
LoadSecureApps: Load app from partition(keymaster): Status = 0x0, AppId = 1
VB: RWDeviceState:READ_CONFIG status=0 read_rsp.status=0 secure_device=1
VB: RWDeviceState: Succeed using rpmb!
enter console_loop time=2516405
exit console_loop time=2516922
reboot_mode= 0x0 uart_mode=0x0 ret=0x0
WrongBatteryShutdown enter
WrongBatteryShutdown enterBatteryNotMatch=0
Platform : MTP
Chip Name : SDM845
Chip Ver : 2.1
Core 0 Freq: 1612 MHz
-----------------------------
UEFI Total : 1454 ms
POST Time [ 2901] OS Loader
Loader Build Info: Dec 26 2018 20:17:40
VB: RWDeviceState:READ_CONFIG status=0 read_rsp.status=0 secure_device=1
VB: RWDeviceState: Succeed using rpmb!
Device support param encryption.
enc_header->magic = A0AD646A, ENCRYPTED_MAGIC = A0AD646A
SID 300 is encrypted
check_enc_block_and_fix: Verify SID 300 Success
enc_header->magic = A0AD646A, ENCRYPTED_MAGIC = A0AD646A
SID 304 is encrypted
check_enc_block_and_fix: Verify SID 304 Success
migrate_custflag_from_plaintext[00000130] Start cust flag migration check
[get_param_by_index_and_offset] sid_index = 304 offset = 164 buf = 9FFCF33C length = 4
Encrypted block 304 is verified success
migrate_custflag_from_plaintext[00000138] Cust flag has been migrated, no need to do further!
[get_param_by_index_and_offset] sid_index = 1 offset = 24 buf = 99764E1C length = 4
[get_param_by_index_and_offset] sid_index = 12 offset = 416 buf = 9FFCF408 length = 4
[OemCheckResetDevInfo] reset_devinfo 2 IsSecureBootEnabled = 1
hw 41 rf 12 man 1 row 16 col 10 fw 0 mode 0
VB: RWDeviceState:READ_CONFIG status=0 read_rsp.status=0 secure_device=1
VB: RWDeviceState: Succeed using rpmb!
Device abl version = 0x31
Image abl version = 0x31
build_product_name_string = fajita
BootReason: 0x0
OpSetBootMode: 0x0
OpGetBootMode=0x0
[get_param_by_index_and_offset] sid_index = 10 offset = 136 buf = 9FFCF214 length = 4
Do RetryCount--
Active Slot _b is bootable, retry count 1
Booting from slot (_b)
AVB version 2
avb_slot_verify.c:436: DEBUG: Loading vbmeta struct from partition 'vbmeta_b'.
hwid is fajita
avb_slot_verify.c:436: DEBUG: Loading vbmeta struct from partition 'system_b'.
avb_slot_verify.c:190: DEBUG: boot_b: Loading entire partition.
avb_slot_verify.c:246: ERROR: boot_b: Hash of data does not match digest in descriptor.
avb_slot_verify.c:190: DEBUG: dtbo_b: Loading entire partition.
State: Unlocked, AvbSlotVerify returned continue boot
VB2: Authenticate complete! boot state is: orange
VB2: boot state: orange(1)
No Ffbm cookie found, ignore: Not Found
Memory Base Address: 0x80000000
Decompressing kernel image start: 3190 ms
Decompressing kernel image done: 3497 ms
--------------------------------------
UFS vendor name = 0x53 0x41 0x4D 0x53 0x55 0x4E 0x47 0x0
UFS product name = 0x4B 0x4C 0x55 0x45 0x47 0x38 0x55 0x31 0x45 0x41 0x2D 0x42 0x30 0x43 0x31 0x0
UFS firmware version = 0x30 0x35 0x30 0x30
--------------------------------------
[UFS][ABL] Unknown UFS
PON Reason is 1 cold_boot:1 charger path: 0
build_Projcet_string = fajita
PonReason=0x1
WarmStatus=-1720300012
COLD: power_on_reason is [0x1]
OemCmdlinPwronReasonInit: enter. startup: androidboot.startupmode=hard_reset
Get_Selinux_state: 3
[get_param_by_index_and_offset] sid_index = 0 offset = 77 buf = 9FFCF038 length = 27
[get_param_by_index_and_offset] sid_index = 300 offset = 128 buf = 9FFCF038 length = 4
Encrypted block 300 is verified success
Get_Selinux_state: 3
Get_Selinux_state: 3
OemInfo.OemCmdLine len 411
Cmdline: androidboot.hardware=qcom androidboot.console=ttyMSM0 video=vfb:640x400,bpp=32,memsize=3072000 msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 service_locator.enable=1 swiotlb=2048 androidboot.configfs=true androidboot.usbcontrol
--------------------------------------
UFS vendor name = 0x53 0x41 0x4D 0x53 0x55 0x4E 0x47 0x0
UFS product name = 0x4B 0x4C 0x55 0x45 0x47 0x38 0x55 0x31 0x45 0x41 0x2D 0x42 0x30 0x43 0x31 0x0
UFS firmware version = 0x30 0x35 0x30 0x30
--------------------------------------
[UFS][ABL] Unknown UFS
PON Reason is 1 cold_boot:1 charger path: 0
build_Projcet_string = fajita
PonReason=0x1
WarmStatus=-1720300012
COLD: power_on_reason is [0x1]
OemCmdlinPwronReasonInit: enter. startup: androidboot.startupmode=hard_reset
Get_Selinux_state: 3
[get_param_by_index_and_offset] sid_index = 0 offset = 77 buf = 9FFCF038 length = 27
[get_param_by_index_and_offset] sid_index = 300 offset = 128 buf = 9FFCF038 length = 4
Encrypted block 300 is verified success
Get_Selinux_state: 3
Get_Selinux_state: 3
OemInfo.OemCmdLine len 411
Cmdline: androidboot.hardware=qcom androidboot.console=ttyMSM0 video=vfb:640x400,bpp=32,memsize=3072000 msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 service_locator.enable=1 swiotlb=2048 androidboot.configfs=true androidboot.usbcontrol
RAM Partitions
Add Base: 0x0000000080000000 Available Length: 0x0000000100000000
Add Base: 0x0000000180000000 Available Length: 0x00000000FC8A0000
WARNING: Could not find mem-offline node.
ERROR: Could not get splash memory region node
kaslr-Seed is added to chosen node

Shutting Down UEFI Boot Services: 3929 ms
BDS: LogFs sync skipped, Unsupported
App Log Flush : 184 ms
Exit BS [ 4118] UEFI End