dotf_selftest_demo Directory Reference

Directory dependency graph for dotf_selftest_demo:

Directories
	src

Detailed Description

Brings up the DOTF (Decryption On The Fly) block and runs its built-in AES self-test on both channels without ever arming one (#127). LED1 toggles while healthy and LED2 on a fault; g_dotf_ok, g_dotf_init_err, g_dotf_reg00 and the two post-trigger REG00 snapshots (g_dotf_st0_snap / g_dotf_st1_snap) mirror the result for a headless probe. No external hardware.

Why it stops where it stops

The full flow to decrypt XiP code is init -> install key -> set IV -> set region -> enable -> jump into XiP. This app runs only the init and the self-test, and that boundary is a safety property rather than an unfinished feature: ra8_dotf_enable arms the AES core over a live XiP window, and the very next instruction fetch would come back as garbage and fault (HUM Ch 45 warning). It also installs no key, stages no IV, programs no conversion region, and writes no OTP, option-setting, security-attribution or flash byte.

Both channels stay in transparent bypass for the whole run, so there are no persistent side effects. The shared module-stop bits are toggled, but that is volatile clock state, not a fuse.

What the headless verdict is worth

The emulator does not model the DOTF APB window, so off-target the self-test register reads are not backed by an AES core at all: the calls return OK and the demo reports healthy without any BIST having run. The headless verdict therefore gates the driver call sequence and nothing more. The genuine AES self-test result lives in the REG00 snapshots read off silicon; off-target they read back zero.

Registers (HUM R01UH1065EJ0130 Ch 45 "DOTF")

• Block overview and the self-test feature: Ch 45.1 p 3048.
• REG00 (AES core / control, +0x080 in the channel window) bit 20 is the self-test trigger and auto-clears on completion: Ch 45.3 "Register Descriptions" p 3049.
• Module-stop is shared with OSPI – MSTPB16 covers DOTF0 plus OSPI0, and MSTPB17 covers DOTF1 plus OSPI1: Ch 45.6.1 "Module-stop Function" p 3050.