[U-Boot] bootcount support on arm/kirkwood

[Heiko Schocher]

Hello Prafulla,

Prafulla Wadaskar wrote:
>> -----Original Message-----
>> From: Heiko Schocher [mailto:hs at denx.de] 
>> Sent: Thursday, July 09, 2009 12:05 PM
>> To: Prafulla Wadaskar
>> Cc: Wolfgang Denk; U-Boot user list; Prabhanjan Sarnaik; 
>> Ashish Karkare
>> Subject: Re: [U-Boot] bootcount support on arm/kirkwood
>>
>> Hello Prafulla,
>>
>> Prafulla Wadaskar wrote:
>>>> -----Original Message-----
>>>> From: Wolfgang Denk [mailto:wd at denx.de]
>>>> Sent: Thursday, July 09, 2009 12:29 AM
>>>> To: Prafulla Wadaskar
>>>> Cc: hs at denx.de; U-Boot user list; Prabhanjan Sarnaik; 
>> Ashish Karkare
>>>> Subject: Re: [U-Boot] bootcount support on arm/kirkwood
>>>>
>>>> Dear Prafulla Wadaskar,
>>>>
>>>> In message
>>>> <73173D32E9439E4ABB5151606C3E19E202DD54DE86 at SC-VEXCH1.marvell.
>>>> com> you wrote:
>>>>>  
>>>>>> I searched for some space on this CPU for implementing
>>>> this feature,
>>>>>> but could not find any (at least 4 bytes = 1 register), 
>> which not 
>>>>>> lost his value on a reset of this CPU.
>>>>> There is reset counter register on Kirkwood which counts
>>>> the time for which H/w Reset is pressed-n-hold. This is generally 
>>>> used to trigger "Factory Reset" Kind of function using reset key.
>>>>> I don't think you are searching for the same. Do you?
>>>> No, he doesn't. He needs a register that is guaranteed to 
>> keep it''s 
>>>> values across a processor reset.
>>> With Kirkwood, the only way to implement it is with flash assist
>> No chance? Is there really no register/mem array which keep 
>> its value across a processor reset?
>>
>> There is a "Security Accelerator SRAM" on this chip. Couldn;t 
>> I use it? (I looked at it, but it seems, the SRAM gets 
>> initialized by reset, but maybe there is a way to deactivate 
>> this initialization?)
> Do you want only across reboots(i.e. resets)? How about re-power cycle?

Yes, I need this only across reboots (processor resets). If
the board is powered off/on, the value of this area gets new
initialized from software.

bye
Heiko
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