Alright, thank you all, I have the cable and have got a readout for boot, as shown below:
@WayneWWW
[0000.126] [TegraBoot] (version 00.00.2018.01-l4t-89b97a49)
[0000.131] Processing in cold boot mode Bootloader 2
[0000.136] A02 Bootrom Patch rev = 1023
[0000.140] Power-up reason: pmc por
[0000.143] No Battery Present
[0000.145] pmic max77620 reset reason
[0000.149] pmic max77620 NVERC : 0x40
[0000.152] RamCode = 0
[0000.154] Platform has DDR4 type RAM
[0000.158] max77620 disabling SD1 Remote Sense
[0000.162] Setting DDR voltage to 1125mv
[0000.166] Serial Number of Pmic Max77663: 0xc24c9
[0000.173] Entering ramdump check
[0000.176] Get RamDumpCarveOut = 0x0
[0000.180] RamDumpCarveOut=0x0, RamDumperFlag=0xe59ff3f8
[0000.185] Last reboot was clean, booting normally!
[0000.189] Sdram initialization is successful
[0000.194] SecureOs Carveout Base=0x00000000ff800000 Size=0x00800000
[0000.200] Lp0 Carveout Base=0x00000000ff780000 Size=0x00001000
[0000.205] BpmpFw Carveout Base=0x00000000ff700000 Size=0x00080000
[0000.211] GSC1 Carveout Base=0x00000000ff600000 Size=0x00100000
[0000.217] GSC2 Carveout Base=0x00000000ff500000 Size=0x00100000
[0000.223] GSC4 Carveout Base=0x00000000ff400000 Size=0x00100000
[0000.229] GSC5 Carveout Base=0x00000000ff300000 Size=0x00100000
[0000.235] GSC3 Carveout Base=0x000000017f300000 Size=0x00d00000
[0000.251] RamDump Carveout Base=0x00000000ff280000 Size=0x00080000
[0000.257] Platform-DebugCarveout: 0
[0000.260] Nck Carveout Base=0x00000000ff080000 Size=0x00200000
[0000.266] Non secure mode, and RB not enabled.
[0000.314] Csd NumOfBlocks=60653568
[0000.319] Set High speed to 1
[0000.324] Using GPT Primary to query partitions
[0000.330] Loading Tboot-CPU binary
[0000.343] Verifying TBC in OdmNonSecureSBK mode
[0000.353] Bootloader load address is 0xa0000000, entry address is 0xa0000258
[0000.360] Bootloader downloaded successfully.
[0000.364] Downloaded Tboot-CPU binary to 0xa0000258
[0000.369] MAX77620_GPIO5 configured
[0000.372] CPU power rail is up
[0000.375] CPU clock enabled
[0000.379] Performing RAM repair
[0000.382] Updating A64 Warmreset Address to 0xa00002e9
[0000.387] Loading NvTbootBootloaderDTB
[0000.423] Verifying NvTbootBootloaderDTB in OdmNonSecureSBK mode
[0000.488] Bootloader DTB Load Address: 0x83000000
[0000.492] Loading NvTbootKernelDTB
[0000.528] Verifying NvTbootKernelDTB in OdmNonSecureSBK mode
[0000.593] Kernel DTB Load Address: 0x83100000
[0000.598] Loading cboot binary
[0000.642] Verifying EBT in OdmNonSecureSBK mode
[0000.684] Bootloader load address is 0x92c00000, entry address is 0x92c00258
[0000.691] Bootloader downloaded successfully.
[0000.696] Next binary entry address: 0x92c00258
[0000.700] BoardId: 3448
[0000.705] Overriding pmu board id with proc board id
[0000.709] Display board id is not available
[0000.751] Verifying SC7EntryFw in OdmNonSecureSBK mode
[0000.803] /bpmp deleted
[0000.805] SC7EntryFw header found loaded at 0xff700000
[0000.993] OVR2 PMIC
[0000.995] Bpmp FW successfully loaded
[0000.999] WB0 init successfully at 0xff780000
[0001.003] Set NvDecSticky Bits
[0001.007] GSC2 address ff53fffc value c0edbbcc
[0001.013] GSC MC Settings done
[0001.017] TOS Image length 53680
[0001.020] Monitor size 53680
[0001.023] OS size 0
[0001.031] Secure Os AES-CMAC Verification Success!
[0001.036] TOS image cipher info: plaintext
[0001.040] Loading and Validation of Secure OS Successful
[0001.056] SC7 Entry Firmware - 0xff700000, 0x4000
[0001.060] NvTbootPackSdramParams: start.
[0001.065] NvTbootPackSdramParams: done.
[0001.069] Tegraboot started after 53779 us
[0001.073] Basic modules init took 677541 us
[0001.077] NvTbootQspiFlashIoctl: Opcode = 1 not supported
[0001.082] Sec Bootdevice Read Time = 622327755 ms, Read Size = 622327755 KB
[0001.089] Sec Bootdevice Write Time = 0 ms, Write Size = 0 KB
[0001.095] Storage Device Read Time = 165 ms, Read Size = 2226 KB
[0001.101] Storage Device Write Time = 0 ms, Write Size = 0 KB
[0001.106] Next stage binary read took 37841 us
[0001.110] Carveout took -49501 us
[0001.113] CPU initialization took 375612 us
[0001.117] Total time taken by TegraBoot 1041493 us
[0001.122] Starting CPU & Halting co-processor
64NOTICE: BL31: v1.3(release):a28d87f09
NOTICE: BL31: Built : 21:10:01, Aug 12 2019
ERROR: Error initializing runtime service trusty_fast
[0001.244] RamCode = 0
[0001.249] LPDDR4 Training: Read DT: Number of tables = 2
[0001.254] EMC Training (SRC-freq: 204000; DST-freq: 1600000)
[0001.267] EMC Training Successful
[0001.270] 408000 not found in DVFS table
[0001.276] RamCode = 0
[0001.280] DT Write: emc-table@204000 succeeded
[0001.285] DT Write: emc-table@1600000 succeeded
[0001.289] LPDDR4 Training: Write DT: Number of tables = 2
[0001.329]
[0001.330] Debug Init done
[0001.333] Marked DTB cacheable
[0001.336] Bootloader DTB loaded at 0x83000000
[0001.341] Marked DTB cacheable
[0001.344] Kernel DTB loaded at 0x83100000
[0001.348] DeviceTree Init done
[0001.359] Pinmux applied successfully
[0001.364] gicd_base: 0x50041000
[0001.367] gicc_base: 0x50042000
[0001.370] Interrupts Init done
[0001.374] Using base:0x60005090 & irq:208 for tick-timer
[0001.379] Using base:0x60005098 for delay-timer
[0001.384] platform_init_timer: DONE
[0001.387] Timer(tick) Init done
[0001.391] osc freq = 38400 khz
[0001.395]
[0001.396] welcome to cboot
[0001.399]
[0001.400] Cboot Version: 00.00.2018.01-t210-3a168c35
[0001.405] calling constructors
[0001.408] initializing heap
[0001.411] initializing threads
[0001.413] initializing timers
[0001.416] creating bootstrap completion thread
[0001.421] top of bootstrap2()
[0001.424] CPU: ARM Cortex A57
[0001.426] CPU: MIDR: 0x411FD071, MPIDR: 0x80000000
[0001.431] initializing platform
[0001.434] Scratch reg 37 & 271 initial value set..
[0001.441] cboot:secure-pmc present
[0001.444] Manufacturer: MF = 0xc2, ID MSB = 0x25
[0001.448] ID LSB = 0x36, ID-CFI len = 194 bytes
[0001.453] Macronix QSPI chip present
[0001.456] SPI device register
[0001.459] init boot device
[0001.462] allocating memory for boot device(SPI)
[0001.467] registering boot device
[0001.476] sdmmc node status = okay
[0001.479] sdcard instance = 0
[0001.482] sdcard gpio handle 0x56
[0001.485] sdcard gpio pin 0xc9
[0001.488] sdcard gpio flags 0x0
[0001.491] vmmc-supply 0x99
[0001.494] Instance: 0
[0001.496] Allocating memory for context
[0001.500] enabling clock
[0001.502] sd card init
[0001.504] Check card present and stable
[0001.508] Send command 0
[0001.525] Send command 3
[0001.529] Set RCA for the card
[0001.532] Query card specific data by command 9
[0001.538] Parse CSD data
[0001.541] Send command 7
[0001.551] Calling sd device register
[0001.554] Init sdcard
[0001.557] Allocating memory for boot device
[0001.561] Registering user device
[0001.574] Enable APE clock
[0001.576] Un-powergate APE partition
[0001.580] of_register: registering tegra_udc to of_hal
[0001.585] of_register: registering tegra_udc to of_hal
[0001.590] of_register: registering inv20628-driver to of_hal
[0001.596] of_register: registering ads1015-driver to of_hal
[0001.601] of_register: registering lp8557-bl-driver to of_hal
[0001.607] of_register: registering bq2419x_charger to of_hal
[0001.613] of_register: registering cpc to of_hal
[0001.617] of_register: registering bq27441_fuel_gauge to of_hal
[0001.629] gpio framework initialized
[0001.632] of_register: registering tca9539_gpio to of_hal
[0001.637] of_register: registering tca9539_gpio to of_hal
[0001.643] of_register: registering i2c_bus_driver to of_hal
[0001.648] of_register: registering i2c_bus_driver to of_hal
[0001.654] of_register: registering i2c_bus_driver to of_hal
[0001.660] of_register: registering i2c_bus_driver to of_hal
[0001.665] pmic framework initialized
[0001.669] of_register: registering max77620_pmic to of_hal
[0001.674] regulator framework initialized
[0001.678] of_register: registering tps65132_bl_driver to of_hal
[0001.684] initializing target
[0001.690] gpio_driver_register: register 'tegra_gpio_driver' driver
[0001.698] fixed regulator driver initialized
[0001.715] initializing OF layer
[0001.718] NCK carveout not present
[0001.721] Skipping dts_overrides
[0001.726] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.742] I2C Bus Init done
[0001.745] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.755] I2C Bus Init done
[0001.758] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.768] I2C Bus Init done
[0001.770] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.781] I2C Bus Init done
[0001.783] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.794] I2C Bus Init done
[0001.796] of_children_init: Ops found for compatible string maxim,max77620
[0001.806] max77620_init using irq 118
[0001.811] register 'maxim,max77620' pmic
[0001.816] gpio_driver_register: register 'max77620-gpio' driver
[0001.822] of_children_init: Ops found for compatible string nvidia,tegra210-i2c
[0001.832] I2C Bus Init done
[0001.836] NCK carveout not present
[0001.839] shim_invoke: No NCT, Calling dts updates
[0001.850] Find /i2c@7000c000's alias i2c0
[0001.854] get eeprom at 1-a0, size 256, type 0
[0001.863] Find /i2c@7000c500's alias i2c2
[0001.867] get eeprom at 3-a0, size 256, type 0
[0001.871] get eeprom at 3-ae, size 256, type 0
[0001.876] pm_ids_update: Updating 1,a0, size 256, type 0
[0001.881] I2C slave not started
[0001.884] I2C write failed
[0001.886] Writing offset failed
[0001.890] eeprom_init: EEPROM read failed
[0001.893] pm_ids_update: eeprom init failed
[0001.898] pm_ids_update: Updating 3,a0, size 256, type 0
[0001.928] pm_ids_update: The pm board id is 3448-0000-200
[0001.934] Adding plugin-manager/ids/3448-0000-200=/i2c@7000c500:module@0x50
[0001.942] pm_ids_update: pm id update successful
[0001.946] pm_ids_update: Updating 3,ae, size 256, type 0
[0001.977] pm_ids_update: The pm board id is 3449-0000-200
[0001.983] Adding plugin-manager/ids/3449-0000-200=/i2c@7000c500:module@0x57
[0001.991] pm_ids_update: pm id update successful
[0002.021] eeprom_get_mac: EEPROM invalid MAC address (all 0xff)
[0002.027] shim_eeprom_update_mac:267: Failed to update 0 MAC address in DTB
[0002.035] eeprom_get_mac: EEPROM invalid MAC address (all 0xff)
[0002.041] shim_eeprom_update_mac:267: Failed to update 1 MAC address in DTB
[0002.049] updating /chosen/nvidia,ethernet-mac node 00:04:4b:e4:12:b3
[0002.056] Plugin Manager: Parse ODM data 0x00094000
[0002.066] shim_cmdline_install: /chosen/bootargs: root=/dev/mmcblk0p1 rw rootw
[0002.087] Find /i2c@7000c000's alias i2c0
[0002.091] get eeprom at 1-a0, size 256, type 0
[0002.100] Find /i2c@7000c500's alias i2c2
[0002.103] get eeprom at 3-a0, size 256, type 0
[0002.108] get eeprom at 3-ae, size 256, type 0
[0002.112] pm_ids_update: Updating 1,a0, size 256, type 0
[0002.117] I2C slave not started
[0002.121] I2C write failed
[0002.123] Writing offset failed
[0002.126] eeprom_init: EEPROM read failed
[0002.130] pm_ids_update: eeprom init failed
[0002.134] pm_ids_update: Updating 3,a0, size 256, type 0
[0002.164] pm_ids_update: The pm board id is 3448-0000-200
[0002.171] Adding plugin-manager/ids/3448-0000-200=/i2c@7000c500:module@0x50
[0002.178] pm_ids_update: pm id update successful
[0002.182] pm_ids_update: Updating 3,ae, size 256, type 0
[0002.212] pm_ids_update: The pm board id is 3449-0000-200
[0002.219] Adding plugin-manager/ids/3449-0000-200=/i2c@7000c500:module@0x57
[0002.226] pm_ids_update: pm id update successful
[0002.256] Chip UID is 000000016441b746240000000bfe8440
[0002.261] Add serial number:042121902251204084fe as DT property
[0002.270] Applying platform configs
[0002.276] platform-init is not present. Skipping
[0002.281] calling apps_init()
[0002.301] Found 14 GPT partitions in "sd0"
[0002.305] Proceeding to Cold Boot
[0002.308] starting app android_boot_app
[0002.312] Device state: unlocked
[0002.315] display console init
[0002.323] could not find regulator
[0002.326] hdmi cable connected
[0002.342] edid read success
[0002.344] width = 640, height = 480, frequency = 25174825
[0002.350] width = 640, height = 480, frequency = 25174825
[0002.355] wDT entry for leds-pwm not found
i[0002.363] dth = 1920, height = 1080, frequency = 148500000
[0002.368] Best mode Width = 640, Height = 480, freq = 25174825
[0002.375] tmds-config node not found
[0002.380] pmc_set_io_pad_voltage: Error -2 retrieving platform-io-pad-voltageps
[0002.394] setting 'vdd-1v8' regulator to 1800000 micro volts
[0002.402] could not find regulator
[0002.405] could not find regulator
[0002.408] could not find regulator
[0002.437] using default cmu settings
[0002.441] dc_hdmi_enable, starting HDMI initialisation
[0002.447] dc_hdmi_enable, HDMI initialisation complete
[0002.452] list and configure display window
[0002.457] display console init completed
[0002.464] subnode volume_up is not found !
[0002.468] subnode back is not found !
[0002.471] subnode volume_down is not found !
[0002.476] subnode menu is not found !
[0002.479] Gpio keyboard init success
[0002.523] found decompressor handler: lz4-legacy
[0002.538] decompressing blob (type 1)...
[0002.571] load_bmp_blob: panelresolution=480 type=0
[0002.622] decompressor handler not found
[0002.626] load_firmware_blob: Firmware blob loaded, entries=2
[0002.632] se_aes_verify_sbk_clear: Error
[0002.635] bl_battery_charging: connected to external power supply
[0002.643] xusb is supported
[0002.649] error while finding nvidia,portmap
[0002.654] could not find regulator
[0003.157] xusb blob version 0 size 124416
[0003.161] firmware size 124416
[0003.166] Firmware timestamp: 0x5cd2a472, Version: 50.22 release
[0003.176] xhci0: 64 bytes context size, 32-bit DMA
[0003.216] usbus0: 5.0Gbps Super Speed USB v3.0
[0003.236] uhub0: <Nvidia XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on u0
[0003.886] uhub0: 9 ports with 9 removable, self powered
[0004.886] failed to get HID devices
[0004.890] failed to init xhci or no usb device attached
[0004.900] device_query_partition_size: failed to open partition sd0:MSC !
[0004.907] MSC Partition not found
[0004.913] device_query_partition_size: failed to open partition sd0:USP !
[0004.920] USP partition read failed!
[0004.923] blob_init: blob-partition USP header read failed
[0004.929] android_boot Unable to update recovery partition
[0004.934] kfs_getpartname: name = LNX
[0004.938] Loading kernel from LNX
[0004.998] Verifying boot image in OdmNonSecureSBK mode
[0005.041] kernel load address: 0x80080000, size: 482032 bytes
[0005.047] ramdisk load address: 0x84100000, size: 0 bytes
[0005.052] load kernel from storage
[0005.064] decompressor handler not found
[0005.122] Successfully loaded kernel and ramdisk images
[0005.128] load_bmp_blob: panelresolution=480 type=0
[0005.202] display bmp image done
[0005.205] NCK carveout not present
[0005.208] Skipping dts_overrides
[0005.211] NCK carveout not present
[0005.215] shim_invoke: No NCT, Calling dts updates
[0005.226] Find /i2c@7000c000's alias i2c0
[0005.230] get eeprom at 1-a0, size 256, type 0
[0005.239] Find /i2c@7000c500's alias i2c2
[0005.243] get eeprom at 3-a0, size 256, type 0
[0005.247] get eeprom at 3-ae, size 256, type 0
[0005.252] pm_ids_update: Updating 1,a0, size 256, type 0
[0005.257] I2C slave not started
[0005.260] I2C write failed
[0005.263] Writing offset failed
[0005.266] eeprom_init: EEPROM read failed
[0005.270] pm_ids_update: eeprom init failed
[0005.274] pm_ids_update: Updating 3,a0, size 256, type 0
[0005.304] pm_ids_update: The pm board id is 3448-0000-200
[0005.311] Adding plugin-manager/ids/3448-0000-200=/i2c@7000c500:module@0x50
[0005.318] pm_ids_update: pm id update successful
[0005.323] pm_ids_update: Updating 3,ae, size 256, type 0
[0005.353] pm_ids_update: The pm board id is 3449-0000-200
[0005.359] Adding plugin-manager/ids/3449-0000-200=/i2c@7000c500:module@0x57
[0005.367] pm_ids_update: pm id update successful
[0005.397] eeprom_get_mac: EEPROM invalid MAC address (all 0xff)
[0005.403] shim_eeprom_update_mac:267: Failed to update 0 MAC address in DTB
[0005.411] eeprom_get_mac: EEPROM invalid MAC address (all 0xff)
[0005.417] shim_eeprom_update_mac:267: Failed to update 1 MAC address in DTB
[0005.426] updating /chosen/nvidia,ethernet-mac node 00:04:4b:e4:12:b3
[0005.432] Plugin Manager: Parse ODM data 0x00094000
[0005.442] shim_cmdline_install: /chosen/bootargs: root=/dev/mmcblk0p1 rw rootw
[0005.457] Add serial number:042121902251204084fe as DT property
[0005.466] "bpmp" doesn't exist, creating
[0005.472] Updated bpmp info to DTB
[0005.477] Updated initrd info to DTB
[0005.480] "proc-board" doesn't exist, creating
[0005.485] Updated board info to DTB
[0005.489] "pmu-board" doesn't exist, creating
[0005.494] Updated board info to DTB
[0005.497] "display-board" doesn't exist, creating
[0005.503] Updated board info to DTB
[0005.506] "reset" doesn't exist, creating
[0005.511] Updated reset info to DTB
[0005.514] Cmdline: tegraid=21.1.2.0.0 ddr_die=4096M@2048M section=512M memtype
[0005.553] DTB cmdline: root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console
[0005.566] boot image cmdline: root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4
[0005.579] Updated bootarg info to DTB
[0005.582] Adding uuid 000000016441b746240000000bfe8440 to DT
[0005.588] Adding eks info 0 to DT
[0005.594] WARNING: Failed to pass NS DRAM ranges to TOS, err: -7
[0005.600] Updated memory info to DTB
[0005.605] Updated system-lp0-disable info to DTB
[0005.613] set vdd_core voltage to 1075 mv
[0005.617] setting 'vdd-core' regulator to 1075000 micro volts
[0005.636] could not find regulator
[0005.640] Found secure-pmc; disable BPMP
U-Boot 2016.07-gd917e08cec (Aug 12 2019 - 21:10:20 -0700)
TEGRA210
Model: NVIDIA P3450-Porg
Board: NVIDIA P3450-PORG
DRAM: 4 GiB
MMC: Tegra SD/MMC: 0, Tegra SD/MMC: 1
Using default environment
In: serial
Out: serial
Err: serial
Net: No ethernet found.
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1 is current device
Scanning mmc 1:1...
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
733 bytes read in 124 ms (4.9 KiB/s)
L4T boot options
1: primary kernel
Enter choice: 1: primary kernel
Retrieving file: /boot/initrd
5562384 bytes read in 564 ms (9.4 MiB/s)
Retrieving file: /boot/Image
34179080 bytes read in 2933 ms (11.1 MiB/s)
append: tegraid=21.1.2.0.0 ddr_die=4096M@2048M section=512M memtype=0 vpr_resizt
## Flattened Device Tree blob at 83100000
Booting using the fdt blob at 0x83100000
reserving fdt memory region: addr=80000000 size=20000
Using Device Tree in place at 0000000083100000, end 0000000083177282
Starting kernel ...
<hit enter to activate fiq debugger>
[ 1.061137] tegradc tegradc.1: dpd enable lookup fail:-19
[ 363.767967] cgroup: cgroup2: unknown option "nsdelegate"
Hopefully that can help us get to the bottom of this.