Hi List, I'm interested in developing a driver for the AT24MAC EEPROM from Atmel. This chip is a strange beast because it integrates two i2c devices with two different addresses in the same package. It has this structure: * The first part of the chip is a classical AT24 eeprom (2K) with a standard address, 0xA radix + 3bits for multiple addressing. * The second part contains a 128 bits serial number + a 48/64 bits (depending on the model) MAC address (usable for example as ethernet mac). The address has 0xB radix + 3bits for multiple addressing. While this second eeprom is readable with the standard AT24 i2c protocol, the registers are a little bit crazy: the 128 bits serial number is in range 80h-8Fh, the 48bits mac is in 9Ah-9Fh, the 64bits mac (the other model) is in rage 98h-9Fh. The problem here is that you have to know exactly the registers to read and their boundaries to get both the numbers, this is driving me writing a new kernel driver. I think that adding so much complexity to the already complex AT24 driver is not advisable and writing a fairly basic new driver respect better the KISS way. Obviously, I will export both serials with a couple of sysfs attributes. With the right mentoring, I can try to export this 48bits MAC to the network layer to be usable by a network card. Have you any advice on this? -- Profile: http://it.linkedin.com/in/compagnucciangelo -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
