[U-Boot] bootcount support on arm/kirkwood

[Prafulla Wadaskar]

> -----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?
Regards..
Prafulla . .

> 
> thanks in advance
> Heiko
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