[U-Boot] [PATCH 4/8] arm: K3: am654: Add support for boot device detection

[Tom Rini <trini@konsulko.com>]

On Tue, Aug 21, 2018 at 08:00:51PM +0530, Lokesh Vutla wrote:

> AM654 allows for booting from primary or backup boot media.
> Both media can be chosen individually based on switch settings.
> ROM looks for a valid image in primary boot media, if not found
> then looks in backup boot media. In order to pass this boot media
> information to boot loader, ROM stores a value at a particular
> address. Add support for reading this information and determining
> the boot media correctly.
[snip]
> diff --git a/arch/arm/mach-k3/Kconfig b/arch/arm/mach-k3/Kconfig
> index c532fbd061..117e5b4e4a 100644
> --- a/arch/arm/mach-k3/Kconfig
> +++ b/arch/arm/mach-k3/Kconfig
> @@ -40,4 +40,11 @@ config MCU_SCRATCHPAD_SIZE
>  	help
>  	  Describes the size of MCU Scratchpad RAM.
>  
> +config BOOT_PARAM_TABLE_INDEX
> +	hex "Address of Array Index to be used within BOOT_PARAM_TABLE"
> +	default 0x41c7fbfc if SOC_K3_AM6
> +	help
> +	  Address at which ROM stores the value which determines if SPL
> +	  is booted up by primary boot media or secondary boot media.
> +

I'm not sure this belongs in Kconfig.  This isn't configurable really is
it?

> +static u32 __get_backup_bootmedia(u32 devstat)
>  {
> +	u32 bkup_boot = (devstat & CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_MASK) >>
> +			CTRLMMR_MAIN_DEVSTAT_BKUP_BOOTMODE_SHIFT;
> +
> +	switch (bkup_boot) {
> +#define __BKUP_BOOT_DEVICE(n)			\
> +	case BACKUP_BOOT_DEVICE_##n:		\
> +		return BOOT_DEVICE_##n;

I really don't like defining the macro in the function like this.  And
in terms of style, I think I'd rather see it spelled out with
case/return as is normally done.

-- 
Tom
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