Differences

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--- projects:panohax [2026/08/13 13:29] – [Flashing] informatic
+++ projects:panohax [2026/08/14 09:37] (current) – [Flash Layout] q3k
@@ Line 11: / Line 11: @@
 ==== TX1 ====
-Stock module, probably 4GiB LPDDR4 and 16GB eMMC?
+Stock module, 4GiB LPDDR4, 16GB eMMC. Production-fused.
 ==== I/O ====
@@ Line 20: / Line 20: @@
 | HDMI Out | Directly from TX1 |
 | HDMI In | Through ??? under a metal can. |
-| DC In | Labeled 54VDC, runs from 31VDC min. |
+| DC In | 5.5x2.5(?), Labeled 54VDC, runs from 36VDC min. |
 | WiFi? Antenna | Built-in Jetson TX1 2.4 + 5G WIFI + Bluetooth radio |
 | Button | Capacitive touch + RGB indicator LED |
@@ Line 28: / Line 28: @@
 | SW1101 RESET | Internal SoC Reset button |
 | J901 SERIAL | Pinout: 1.8V, TX, GND, RX. Mind the logic 1.8V levels! 1.8V line dips when ''RESET'' button is pushed down. |
+| TP1201 | Unmarked 12V DC rail test point (between AON_P5VO and T1502 transformer), can be used to power up the device directly (bypasses PoE/DC IN circuit), boots from ~11V DC |
 ===== Stock Software =====
@@ Line 37: / Line 39: @@
 Jetson TX1 is SecureBoot/Production-fused. Standard CBoot (first-stage bootloader) is **unlocked** ie. it does not do any signature verification over loaded ''boot'' partition or the operating system altogether.
+==== Flash Layout ====
+(in bold our current best guess for what the bootchain needs to get to CBOOT.
+^ Number ^ Start ^ Size ^ Name ^ Description ^
+| 1 | 17.4kB | 2097kB | **BPF** | TegraBoot (a.k.a. nvtboot) for BPMP |
+| 2 | 2115kB | 262kB | **TBC** | TegraBoot for CPU |
+| 3 | 2377kB | 262kB | TBC-B | TegraBoot for CPU, B-partition |
+| 4 | 2639kB | 2097kB | **EBT** | CBOOT, loaded by TegraBoot |
+| 5 | 4736kB | 2097kB | RBL | CBOOT, B-partition |
+| 6 | 6833kB | 2097kB | NCT | Non-volatile vital product data |
+| 7 | 8930kB | 6291kB | WB0 | Warm Boot Firmware for device unsuspend |
+| 8 | 15.2MB | 2097kB | DFI | all 0x00 |
+| 9 | 17.3MB | 4194kB | **RP1** | DTB for CBOOT |
+| 10 | 21.5MB | 4194kB | RP2 | 0x24 random bytes, then 0x00 |
+| 11 | 25.7MB | 6291kB | **TOS** | Trusted OS/Firmware, loaded by TegraBoot |
+| 12 | 32.0MB | 80.9kB | EKS | "Encrypted Key Storage" |
+| 13 | 32.1MB | 2097kB | UKS | all 0x00 |
+| 14 | 34.2MB | 2097kB | FB | all 0x00 |
+| 15 | 36.3MB | 134MB | BMP | Splashscreen partition |
+| 16 | 170MB | 26.7MB | SOS | Android Recovery image |
+| 17 | 197MB | 4194kB | DTB | DTB for Kernel |
+| 18 | 201MB | 26.7MB | LNX | Android Boot image ("boot" fastboot partition) |
+| 19 | 228MB | 2147MB | APP | ext4 /system |
+| 20 | 2376MB | 2147MB | CAC | ext4 /cache |
+| 21 | 4523MB | 805MB | vendor | ext4 /vendor |
+| 22 | 5328MB | 2097kB | MSC | all 0x00 |
+| 23 | 5331MB | 33.6MB | USP | all 0x00 |
+| 24 | 5364MB | 2097kB | MDA | verity metadata partition |
+| 25 | 5366MB | 8389kB | RP3 | empty ext4 |
+| 26 | 5375MB | 8389kB | RP4 | all 0x00 |
+| 27 | 5383MB | 16.8MB | FCT | empty ext4 |
+| 28 | 5400MB | 8389kB | UCB | empty ext4, "touchscreen" and "mpu" directories |
+| 29 | 5408MB | 2147MB | FAC | ext4 with "factory_restore.zip" update image applied when touch button is pressed on boot |
+| 30 | 7556MB | 1074MB | PLC | ext4 with some polycom config stuff |
+| 31 | 8629MB | 262kB | CRT | public/private key pair? |
+| 32 | 8630MB | 7128MB | UDA | ext4 /data |
 ===== Flashing =====
-Flashing is possible via Fastboot over USB-A 2.0 connector (via cursed USB A-A or USB A-C connector). In order to enter Fastboot you can either:
+==== Fastboot ====
+Flashing is possible via Fastboot (implemented in cboot) over USB-A 2.0 connector (via cursed USB A-A or USB A-C connector). In order to enter Fastboot you can either:
   * ''reboot bootloader'' from Android firmware
@@ Line 47: / Line 89: @@
 **QUIRK:** Fastboot tends to crash/reset whenever HDMI Out is not connected to any display lmao.
+==== RCM/TegraFlash ====
+Alternative: ''tegraflash.py'' from L4T BSP.
+**NOTE:** Latest L4T tooling doesn't really seem to work very well. Use [[https://developer.nvidia.com/embedded/dlc/tx1-driver-package-r2423|R24.2.3]]. Issue seems to be with ''nvtboot_recovery.bin'':
+<code>
+$ sha256sum */Linux_for_Tegra/bootloader/nvtboot_recovery.bin
+f3a54b2e29857ad627c6ae96352e8d1a2e9b538cca502f3565896c6f6cb51746  l4t24/Linux_for_Tegra/bootloader/nvtboot_recovery.bin # works
+d97c0c37201a5b98fabcc509ac57326bbde8076cee0b5294f969634d4b43a42  l4t28/Linux_for_Tegra/bootloader/nvtboot_recovery.bin # hangs
+cd6ec5b3c212fdc44d6d36e043448d2b3484749105005b612fcd043869bd53ac  l4t32/Linux_for_Tegra/bootloader/nvtboot_recovery.bin # crashes with error 4
+</code>
+^ Known Error ^ Reason ^
+| <code>[   0.0221 ] Boot Rom communication failed
+Error: Return value 3</code> | Device is fused, needs fusee-launcher |
+| <code>[   0.0667 ] Cboot is not running on device.
+Error: Return value 4</code> | Device crashed, needs a reset (or different ''nvtboot_recovery.bin'') |
+As ''--bl'' use cboot from our device (''mmcblk0p4'').
+<code>
+./fusee-launcher.py -w -V 0x0955 -P 0x7721 ipatch_rcm_sample.bin
+python3 tegraflash.py --bl mmcblk0p4.img --applet nvtboot_recovery.bin --chip 0x21 --cmd "read DTB dtb-extracted.bin"
+</code>
 ===== Booting Linux =====
@@ Line 57: / Line 125: @@
 fastboot reboot
 </code>
+===== References =====
+  * https://yifan.lu/2022/06/17/unbricking-shield-tv-2015-with-a-bootrom-exploit/
+  * https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3275/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/part_config.html