From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Schocher Date: Thu, 09 Jul 2009 09:26:30 +0200 Subject: [U-Boot] bootcount support on arm/kirkwood In-Reply-To: <73173D32E9439E4ABB5151606C3E19E202DD54DFED@SC-VEXCH1.marvell.com> References: <73173D32E9439E4ABB5151606C3E19E202DD54DFED@SC-VEXCH1.marvell.com> Message-ID: <4A559BA6.5040508@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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@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 -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany