driver-api/mtd/spi-intel.rst

2 Upgrading BIOS using spi-intel
5 Many Intel CPUs like Baytrail and Braswell include SPI serial flash host
7 Since contents of the SPI serial flash is crucial for machine to function,
11 Not all manufacturers protect the SPI serial flash, mainly because it
14 The spi-intel driver makes it possible to read and write the SPI serial
15 flash, if certain protection bits are not set and locked. If it finds
16 any of them set, the whole MTD device is made read-only to prevent
17 partial overwrites. By default the driver exposes SPI serial flash
18 contents as read-only but it can be changed from kernel command line,
21 Please keep in mind that overwriting the BIOS image on SPI serial flash
28  1) Download and extract the latest Minnowboard MAX BIOS SPI image
31  2) Install mtd-utils package [2]. We need this in order to erase the SPI
32     serial flash. Distros like Debian and Fedora have this prepackaged with
33     name "mtd-utils".
63  7) Erase the SPI serial flash. After this step, do not reboot the
67 	Erasing 4 Kibyte @ 7ff000 -- 100 % complete
73  9) Verify that the new content of the SPI serial flash matches the new
86 ----------
90 [2] http://www.linux-mtd.infradead.org/