-----Original Message----- From: Heiko Schocher [mailto:hs@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@denx.de] Sent: Thursday, July 09, 2009 12:29 AM To: Prafulla Wadaskar Cc: hs@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@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 -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany