Artesyn COMX-P40x0 ENP2 Installation and Use (January 2015) - Manual (Page 111)

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COMX-P40x0 ENP2 Installation and Use (6806800R95C) 111
U-Boot provides the following utilities for I2C bus and devices.
I2C buses in the U-Boot have been re-assigned as follows:
The devices displayed via the "i2c probe" command are 7-bit I2C addresses. The addresses
found in the HW
Table 4-8 on page 86 are 8-bit addresses. (For example: 7-bit address 0x18
corresponds to the 8-bit address 0x30)
Table 7-8 U-Boot I2C Utilities
Utility Description
i2c crc32 chip address[.0, .1, .2] count Compute CRC32 checksum
i2c dev [dev] Shows or sets current I2C bus
i2c loop chip address[.0, .1, .2] [# of objects]
[# of delay(us)] Loops reading of device
i2c md chip address[.0, .1, .2] [# of objects] Reads from I2C device
i2c mm chip address[.0, .1, .2] Writes to I2C device (auto-incrementing)
i2c mw chip address[.0, .1, .2] value [count] Writes to I2C device (fill)
i2c nm chip address[.0, .1, .2] Writes to I2C device (constant address)
i2c probe Shows devices on the I2C bus
i2c read chip address[.0, .1, .2] length
memaddress Reads to memory
i2c reset Re-initializes the I2C Controller
i2c speed [speed] Shows or set I2C bus speed
’i2c dev 0’ selects I2C<1>
’i2c dev 1’ selects I2C<2>
’i2c dev 2’ selects I2C<4>