Switch Tegra BootROM Structure

This tree is the Switch-era NVIDIA Tegra boot ROM material from t210_t214_brom/.

The Erista and Mariko folders are mostly headless first-stage boot code: startup, media loading, USB recovery, cryptography, fuses, clocks, SDRAM, and power checks.

Top-Level Roots

Folder	Function
`t210_t214_brom/`	Container for the Tegra boot ROM material. It splits into T210/Erista and T214/Mariko source trees.
`erista-bootrom-master@96df02fd1a1/`	T210/Erista boot ROM source tree, including the checked-out `t210_bootrom/` project.
`mariko-bootrom/`	T214/Mariko boot ROM project. This tree is reorganized around `core/` and `io/` libraries, plus a Mariko-specific specification PDF.

Erista T210 Layout

Area	Function
`nvboot/main`	Main boot flow, reset/startup glue, boot0 assembly/C wrappers, linker scatter material, and image post-processing helpers.
`nvboot/coldboot`	Cold-boot orchestration before handing off to loaded boot content.
`nvboot/bootloader`	Boot configuration parsing, bootloader loading, bad-block handling, and reader coordination.
`nvboot/rcm`	USB recovery-mode command and transport path.
`nvboot/usbf`, `usb3`, `xusb_dev`	USB device and XUSB support used by recovery and boot-media workflows.
`nvboot/sdmmc`, `nand`, `spi_flash`, `snor`, `sata`, `ufs`	Boot-media drivers and reader backends.
`nvboot/se`, `ssk`, `hash`	Security-engine, signing-key, and hash support for authenticated boot decisions.
`nvboot/clocks`, `sdram`, `pmc`, `pads`, `fuse`	Hardware bring-up: clocks, memory controller/SDRAM, power-management controller, pinmux/pads, and fuse state.
`t210_bootrom/include/t210`	Public/internal interfaces, boot parameter structs, generated SDRAM fields, context definitions, and version metadata.
`ipatch.a02.P.2018.1.18.1.fcode.ss`	Patch-style assembly material adjacent to the T210 boot ROM tree.

Mariko T214 Layout

Area	Function
`nvboot/core/startup`	Reset/startup assembly, C boot wrapper, and small runtime primitives such as memory copy/set.
`nvboot/core/dispatcher`	Boot task scheduling and secure/nonsecure task split.
`nvboot/core/coldboot`, `bootloader`, `devmgr`	Main cold-boot path, bootloader/BCT handling, and device-manager selection logic.
`nvboot/core/cryptomgr`, `se`, `pka`, `rsa_dev_mgr`, `sha_dev_mgr`	Mariko-era authentication and cryptographic verification support.
`nvboot/core/car`, `sdram`, `bpmp`, `pmc`, `pads`, `fuse`	Core hardware bring-up: clocks/resets, SDRAM, BPMP support, power, pinmux, and fuse reads.
`nvboot/core/lowbattery`, `external_pmic`	Power-state checks, low-battery gating, and external PMIC/I2C support.
`nvboot/io`	Separated I/O driver libraries for UART, SD/MMC, USB3/XUSB device, SPI flash, UFS, SATA, and related boot media.
`nvboot/include/t214`, `include/t214`	Mariko-specific interfaces, boot parameters, contexts, generated SDRAM fields, signatures, test vectors, and version data.
`ldscripts/nvboot.ld`, `nvboot/Makefile`	ROM image layout and top-level build wiring.