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

[Lokesh Vutla <lokeshvutla@ti.com>]

On Friday 24 August 2018 07:41 PM, Tom Rini wrote:
> 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?

Agreed. Will drop the prompt string in v2.

> 
>> +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.

Sure. Will fix it in v2.

Thanks and regards,
Lokesh

>