NAME

mx25l —

driver for SpiFlash(tm) compatible non-volatile storage devices

SYNOPSIS

To compile this driver into the kernel, place the following line in your kernel configuration file:

device mx25l

Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

mx25l_load="YES"

DESCRIPTION

The mx25l driver provides support for the family of non-volatile storage devices known collectively as SpiFlash(tm). SpiFlash chips typically have part numbers beginning with EN25, IS25, MX25, S25, SST25, or W25.

The mx25l driver uses opcode 0x9f to read the manufacturer and device ID data to determine whether the device is supported. The device ID is looked up using a table of data within the driver which describes the attributes of each supported device, such as block size, sector size, and device capacity. When a supported device is found, the mx25l driver creates a disk device and makes it accessible at /dev/flash/mx25l?. The new disk device is then tasted by the available geom(4) modules as with any disk device.

HARDWARE

The mx25l driver provides support for the following devices:

AT25DF641
EN25F32
EN25P32
EN25P64
EN25Q32
EN25Q64
GD25Q64
M25P32
M25P64
MX25L1606E
MX25LL128
MX25LL256
MX25LL32
MX25LL64
S25FL032
S25FL064
S25FL128
S25FL256S
SST25VF010A
SST25VF032B
W25Q128
W25Q256
W25Q32
W25Q64
W25Q64BV
W25X32
W25X64

FDT CONFIGURATION

On an fdt(4) based system, the mx25l device is defined as a slave device subnode of the SPI bus controller node. All properties documented in the spibus.txt bindings document can be used with the mx25l device. The most commonly-used ones are documented below.

The following properties are required in the mx25l device subnode:

compatible: Must be the string "jedec,spi-nor".
reg: Chip select address of device.
spi-max-frequency: The maximum bus frequency to use when communicating with this slave device. Actual bus speed may be lower, depending on the capabilities of the SPI bus controller hardware.

The following properties are optional for the mx25l device subnode:

spi-cpha: Empty property indicating the slave device requires shifted clock phase (CPHA) mode.
spi-cpol: Empty property indicating the slave device requires inverse clock polarity (CPOL) mode.
spi-cs-high: Empty property indicating the slave device requires chip select active high.

HINTS CONFIGURATION

On a device.hints(5) based system, such as MIPS, these values are configurable for mx25l:

hint.mx25l.%d.at: The spibus the mx25l instance is attached to.
hint.mx25l.%d.clock: The maximum bus frequency to use when communicating with this device. Actual bus speed may be lower, depending on the capabilities of the SPI bus controller hardware.
hint.mx25l.%d.cs: The chip-select number to assert when performing I/O for this device. Set the high bit (1 << 31) to invert the logic level of the chip select line.
hint.mx25l.%d.mode: The SPI mode (0-3) to use when communicating with this device.

FILES

/dev/flash/mx25l?: Provides read/write access to the storage device.
/dev/flash/spi?: An alias for the /dev/mx25l? device, for backwards compatibility with older versions of the driver.

HISTORY

The mx25l driver first appeared in FreeBSD 8.0.