mx25l4

Usage

Overview

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/spi?. The new disk device is then tasted by the available geom(4) modules as with any disk device.

Hardware

The mx25l driver supports the following spi flash memory devices:

• AT25DF641

• EN25F32

• EN25P32

• EN25P64

• EN25Q32

• EN25Q64

• GD25Q64

• M25P32

• M25P64

• MX25L1606E

• MX25LL128

• MX25LL256

• MX25LL32

• MX25LL64

• N25Q64

• 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/spi?

Provides read/write access to the storage device.