New BBB Cape, should I bother with the EEPROM?

[Joshua Datko]

I'm making a limited use BBB cape, that uses I2C from P9_19/20 and UART from P9_24/26, should I bother putting the EEPROM on there for id? The SRM still says yes, but I think the new style is uboot overlays? 

In this case, I know the BBB will always have this cape, and no others, attached. (Software later in the boot process can handle with the case when it's not really attached).

I know there has been some discussion but the SRM conflicts with that and I can't remember the conclusion.

I mean, it's easy enough to put on there but my impression is that it is essentially not used anymore by uboot or the kernel.

Thanks,

Josh

[Robert Nelson]

Hi Josh,

It's really up to you at this point. If you have an eeprom installed,
we will read it in U-Boot and load the proper overlay.

Note: just because U-Boot used those pins as i2c, your overlay could
switch them to can/spi/gpio/etc. ;)

You can see this today with our default images, where P9.19/P9.20
default to i2c, but the other modes are now available in user space
thru config-pin once the kernel takes over:

https://github.com/RobertCNelson/ti-linux-kernel-dev/blob/ti-linux-4.14.y/patches/soc/ti/uboot/0002-am335x-bone-common-config-pin-carve-out-P9.19-P9.20.patch

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Joshua Datko]

Ah yes, makes sense, thanks!