Use SPI with Flashrom

First we will look at SPI0 

Connect to your PI and then : 

sudo apt update

sudo apt install flashrom 

sudo raspi-config ( from interfaces enable SPI && save and exit)

Then enable SPI in the kernel:

modprobe spidev
modprobe spi_bcm2835

Now you can connect the carrier board with the flash memory on it to the RPI HAT SPI0 Port and check if the Memory is recognized :

 flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=512
 
 To dump a memory you can run the following command :
 
 flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=512 -c CHIPNAME_AS_IDENTIFIED_IN_THE_PREVIOUS_COMMAND -r DESIRED_FILE_NAME.EXTENSION
 
 To write a dump to another memory IC
 
 flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=512 -c CHIPNAME_AS_IDENTIFIED_IN_THE_PREVIOUS_COMMAND -w DESIRED_FILE_NAME.EXTENSION

If you have to add a few blocks to make the size match use :

truncate -s +NUMBER_OF_BLOCKS DESIRED_FILE_NAME.EXTENSION


Be careful and please bear in mind I can not be blamed for any mistake you make or any device that you damage or any other thing that doesn't work in your setup or around it !

Now to use the SPI1 we have to :

Connect to your PI and then : 

sudo apt update

sudo apt install flashrom 

sudo raspi-config ( from interfaces enable SPI && save and exit)

Then enable SPI in the kernel:

modprobe spidev
modprobe spi_bcm2835

sudo nano /boot/config.txt

Add at the bottom 

dtoverlay=spi1-3cs  #3 chip select

REBOOT

In flashrom

flashrom -p linux_spi:dev=/dev/spidev1.2,spispeed=500