flash

Documentation

Overview

flash reads and writes to a flash chip.

Synopsis:

flash -p PROGRAMMER[:parameter[,parameter[...]]] [-r FILE|-w FILE]

Options:

-p PROGRAMMER: Specify the programmer with zero or more parameters (see
               below).
-r FILE: Read flash data into the file.
-w FILE: Write the file to the flash chip. First, the flash chip is read
         and then diffed against the file. The differing blocks are
         erased and written. Finally, the contents are verified.

Programmers:

dummy
  Virtual flash programmer for testing in a memory buffer.

  dummy:image=image.rom
    File to memmap for the memory buffer.

linux_spi:dev=/dev/spidev0.0
  Use Linux's spidev driver. This is only supported on Linux. The dev
  parameter is required.

  linux_spi:dev=/dev/spidev0.0,spispeed=5000
    Set the SPI controller's speed. The frequency is in kilohertz.

Description:

flash is u-root's implementation of flashrom. It has a very limited
feature set and depends on the the flash chip implementing the SFDP.