[U-Boot] [PATCH] imx: save reset cause in 'reset_cause' environment variable

[Eric Nelson]

Hi Troy,

On 02/05/2015 04:06 PM, Troy Kisky wrote:
> On 2/5/2015 3:58 PM, Eric Nelson wrote:
>> The cause of a reset is generally useful, and shouldn't be
>> blindly cleared in the process of displaying it as a part
>> of the boot announcement.
>>
>> Stash the string representation in the environment variable
>> "reset_cause".
>>
>> Values include:
>> 	"POR"		- power on reset
>> 	"CSU"		- reset was the result of the csu_reset_b input
>> 	"IPP-USER"	- ipp_user_reset_b qualified reset
>> 	"WDOG"		- watchdog reset
>> 	"JTAG-HIGH-Z"	- HIGH-Z reset from JTAG
>> 	"JTAG-SW"	- software reset from JTAG
>> 	"WARM-BOOT"	- WARM boot was initiated by software
>>
>> <snip>
>>
>>  	switch (cause) {
>>  	case 0x00001:
>>  	case 0x00011:
>> -		return "POR";
>> +		rval = "POR";
>> +		break;
>>
>> <snip>
>>
>> -	default:
>> -		return "unknown reset";
>> +		rval = "WARM-BOOT";
> 
> Instead of removing default, can we have a hex value, something like
> 		sprintf(buf, "unknown(0x%x)", cause);
> 

Of course (if we go that route).

I thought of this when typing up the list of values for the
commit comment.

The human readable form is harder to handle on the receiving
side though, which is why I favor hex.

Regards,


Eric