[U-Boot] SPI and I2C EEPROM
Hi all,
On one of our new boards we have both a SPI (M9256-W) and I2C (24lc256) EEPROM. I have run into a couple of issues. First of all, it looks like the eeprom command can only handle one EEPROM device. It would be useful if multiple devices could be supported.
Another issue I ran into is that the M95XXX driver is hard coded to use CS1.
Perhaps the eeprom command could be enhanced to specify whether the device should be spi or i2c rather than hard coded as well as support multiple devices?
-Aaron
Never mind about the multiple devices, it looks like that is supported. My problem is still that only either I2C or SPI are supported and not both.
-Aaron
On 11/18/2013 08:18 PM, Aaron Williams wrote:
Hi all,
On one of our new boards we have both a SPI (M9256-W) and I2C (24lc256) EEPROM. I have run into a couple of issues. First of all, it looks like the eeprom command can only handle one EEPROM device. It would be useful if multiple devices could be supported.
Another issue I ran into is that the M95XXX driver is hard coded to use CS1.
Perhaps the eeprom command could be enhanced to specify whether the device should be spi or i2c rather than hard coded as well as support multiple devices?
-Aaron
Hello Aaron,
Am 19.11.2013 05:18, schrieb Aaron Williams:
Hi all,
On one of our new boards we have both a SPI (M9256-W) and I2C (24lc256) EEPROM. I have run into a couple of issues. First of all, it looks like the eeprom command can only handle one EEPROM device. It would be useful if multiple devices could be supported.
Yes for "you run into issues"...
The current eeprom driver can handle multiple i2c eeproms on one i2c bus, see define CONFIG_SYS_I2C_MULTI_EEPROMS in common/cmd_eeprom.c
But not spi and i2c on one board ... and maybe you need also to specify the eeprom addr len?
Another issue I ran into is that the M95XXX driver is hard coded to use CS1.
Perhaps the eeprom command could be enhanced to specify whether the device should be spi or i2c rather than hard coded as well as support multiple devices?
Yes its software, so that could be done.
Device driver model would help here much...
bye, Heiko
participants (2)
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Aaron Williams -
Heiko Schocher