Table des matières
Rpi3 Eeprom Flash
Objectif
Lecture ecriture d'eeprom SOP8 avec l'utilitaire flashrom sur rpi3.
Raccordement Interface SPI
Pin Mapping
 |  |
Pin functions
| IC Pin | IC Name | Wire Colour | RPi3/4 Pin | RPi3/4 Name | Function |
|---|---|---|---|---|---|
| 1 | /CS | White | 24 | SPI_CE0_N | Chip select; drive low to enable device |
| 2 | DO | Grey | 21 | SPI_MISO | Standard SPI data output (from chip) |
| 3 | /WP | Blue | 16 | GPIO23 / GPIO_GEN4 | Write protect; drive high to enable status registers to be written |
| 4 | GND | Black | 25 | Ground | Ground |
| 5 | DI | Orange | 19 | SPI_MOSI | Standard SPI data input (to chip) |
| 6 | CLK | Yellow | 23 | SPI_CLK | SPI clock |
| 7 | /HOLD | Green | 18 | GPIO24 / GPI_GEN5 | Hold; drive low to pause device while actively selected |
| 8 | VCC | Red | 17 | 3.3v | Power supply (NB do not use 5v) |
Breadboard
S'équiper en support zif sop8 150mil et 200mil
R/W eeprom
Flashrom
Package apt-get install falshrom sur raspbian.
Penser à activer l'interface spi via l'interface raspi-config
Read
flashrom --programmer linux_spi:dev=/dev/spidev0.0,spispeed=1000 --read dump.bin
Toujours dumper 2 ou 3 fois et comparer les md5sum
Write
flashrom --programmer linux_spi:dev=/dev/spidev0.0,spispeed=1000 --write dump.bin
Plus d'infos sur le site de flashrom : https://www.flashrom.org/RaspberryPi
Comparer 2 dumps
vimdiff -y <(xxd bios_locked.bin) <(xxd bios_unlocked.bin)