[U-Boot] bootcount support on arm/kirkwood

[Heiko Schocher]

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?)

thanks in advance
Heiko
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