Table of Contents
IT9919 Hacking - part 1 - Reading firmware with flashrom
Summary
Aug 20, 2019In this series I will be hacking around with the IT9919 media processor that powers the Lenkeng LKV373 HDMI Extender Device and the EZCAP 283S which were reviewed in previous videos.
In this video I will show some tools and techniques for reading and writing to flash chips with the flashrom open-source flash-reader software and “Blue Pill” STM32F103 board
Source Information
-
- Daniel Kucera's Repository (includes upgrade files, and other captured information).
Firmware Backups
- Backups of the original content of the flash chips: 20181226-lkv-373a-backups.zip
Blue Pill Flash Reading
General Info
Firmware Loading
Software
- Firmware: stm32-vserproc
Wiring
| Serial Port Pin | Blue Pill Pin |
|---|---|
| GND | G |
| RXD | PA9 (TX1) |
| TXD | PA10 (RX1) |
| 3.3V | 3.3 |
Jumpers
- Boot0 (Outboard): 1
- Boot1 (Inboard): 0
Reading/Writing Flash
Wiring
| 23/25/26 Series Pin | Blue Pill Pin |
|---|---|
| 1 (CS#) | PA4 |
| 2 (MISO) | PA6 |
| 3 (WP#) | G for Write Enable, 3.3 for Read-only |
| 4 (GND) | G |
| 5 (MOSI) | PA7 |
| 6 (SCK) | PA5 |
| 7 (HOLD#) | 3.3 |
| 8 (VCC) | 3.3 |