spidev-based EEPROM programmer for 93Cxx serial EEPROMs
eeprom-93cx6 is a utility for manipulating the contents of Microwire SPI serial EEPROMs.
Since 93Cxx EEPROMS do not have a support ID command, the geometry and communication parameters must be known ahead of time. This is complicated by the fact that SPI commands use a different number of bits the address field, depending, on the device geometry. For example, a 93C66 will use 9 address bits in a 512x8 configuration, and only 8 bits in a 256x16 configuration. However, the number of address bits is not necessarily related to the number of words. A 93C56, although half the size, uses the same number of address bits.
To simplify choosing the parameters, eeprom-93cx6 understands a number of different profiles. This is specified with the '--eeprom-type' option. For x16 devices, the '--x16' option must also be specified.
If a profile is not available for the EEPROM, its size (in bytes) and number of address bits can be specified with the '--eeprom-size' and '--addr-bits' options. Note that either the eeprom type or size and address bits can be specified, but not both.
- -D, --spi-device Specify SPI device\n
- -t, --eeprom-type Specify EEPROM type/part number\n
- --x16 Specify if EEPROM is an x16 configuration\n
- -r, --read Save contents of EEPROM to 'file'\n
- -w, --write Write contents of 'file' to EEPROM\n
- --burst-read (advanced) Read EEPROM in single read command\n
- -e, --erase Erase EEPROM\n
- -b, --addr-bits Specify number of address bits in command header\n
- -s, --eeprom-size Specify size of EEPROM in bytes\n
- -h, --help Display this help menu\n
Read a 93c66 in 256x16 configuration:
eeprom-93cx6 -D /dev/spidev2.0 -r eeprom.bin -t 93c66 --x16
Erase a 256x16 (512 byte) eeprom with 8 command address bits:
eeprom-93cx6 -D /dev/spidev2.0 -e -b8 -s 512 --x16