[U-Boot] [PATCH 3/6] am335x_evm: Only set CONFIG_NAND when !CONFIG_SPI_BOOT

Tom Rini
2013-05-13T12:21:20Z

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On 05/12/2013 05:08 PM, Peter Korsgaard wrote:
>>>>>> "Tom" == Tom Rini <trini@ti.com> writes:
>
> Tom> Due to hardware design, we can't have NAND present (as we know
> of NAND Tom> today) when booting from SPI, so disable NAND then as
> that simplifies Tom> logic.
>
> Sorry, this description is not clear to me. I didn't check in
> detail, but as far as I remember the default pins for spi0 don't
> conflict with gmpc.
>
> It's also not quite clear to me if you refer to SW support fo
> NAND flash or the hardware component when you say 'NAND' above.

OK, good point. I'm talking about HW support, and it should be
spelled put better. Note that we're talking about the TI GP EVM, EVM
SK, BeagleBone White and BeagleBone Black here, and not custom
hardware. The EVM SK does not allow for expansion such as adding
NAND/NOR flash and probably not SPI. The GP EVM can have only one of
NOR, NAND or SPI flash active based on the profile that is selected
for the whole hardware stack. The BeagleBone White may have a "memory
cape" installed which in turn can have a NAND, NOR or eMMC board
plugged into it. It's not impossible someone could come up with a SPI
flash cape and plug the memory cape into that, or come up with a
complex breadboard solution. But lets see that happen and work before
worrying about that particular permutation.

- --
Tom
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