Artesyn COMX-P40x0 ENP2 Installation and Use (August 2014) - Manual (Page 100)

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COMX-P40x0 ENP2 Installation and Use (6806800R95B) 100
7.15 I2C
There are a total of four I2C buses in the COMX-P40x0, labeled as I2C<1/2/3/4>. For more
information, see
GPIO on page 68 .
U-Boot provides the following utilities for I2C bus and devices.
nand write Addr off|partition size
Read/write ’size’ bytes starting at offset ’off’ to/from memory
address ’addr’, skipping bad blocks.
nand erase [clean] [off size] Erase ’size’ bytes from offset ’off’ (will erase on the entire device if it
is not specified)
nand bad Shows bad blocks
nand dump[.oob] off Dumps page
nand scrub Cleans NAND by erasing bad blocks. Considered unsafe.
nand markbad off [...] Marks bad block or blocks at offset. Considered unsafe.
nand biterr off Makes a bit error at offset. Considered unsafe.
Table 7-7 NAND Flash Command Usage (continued)
Command Description
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