Dear Fabio Estevam,

Hi,

I need to provide a get_board_rev() function that depends on I2C probe of a PMIC to decide between the board revision.

I2C is only available after relocation,

On arm? Not at all ;-) check arch/arm/lib/board.c

so what is the correct way to "delay" get_board_rev, so that it gets called only at a time when I2C is ready?

Well ... implement board-specific hack in your boardfile that detects the PMIC early?

Thanks,

Fabio Estevam _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot

Best regards, Marek Vasut

On 05/28/2012 11:25 PM, Fabio Estevam wrote:

I need to provide a get_board_rev() function that depends on I2C probe of a PMIC to decide between the board revision.

I2C is only available after relocation, so what is the correct way to "delay" get_board_rev, so that it gets called only at a time when I2C is ready?

I2C is usually available earlier, as it is used to read the SPD on memory modules.

When I last did it, I had to change U-Boot slightly to support a second I2C bus, as the bus selection variable was located in flash before relocation (very old version of U-Boot, so may not apply still).

I've only had a problem using I2C very early in the boot sequence, like before the system clocks have been setup, then the solution to that was to just use a GPIO strapping instead for clock selection.