[U-Boot] bootcount support on arm/kirkwood

[U-Boot] bootcount support on arm/kirkwood

[Heiko Schocher]

Hello,

does somebody know, if it is possible to use the uboot bootcount feature
on an ARM926EJS (CPU Core Version FEROCEON_88FR131 SOC Family: KIRKWOOD,
KW88F6281) based board ?

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.

thanks in advance
Heiko
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[U-Boot] bootcount support on arm/kirkwood

[Prafulla Wadaskar]

 

> -----Original Message-----
> From: u-boot-bounces at lists.denx.de 
> [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Heiko Schocher
> Sent: Wednesday, July 08, 2009 6:42 PM
> To: U-Boot user list
> Subject: [U-Boot] bootcount support on arm/kirkwood
> 
> Hello,
> 
> does somebody know, if it is possible to use the uboot 
> bootcount feature on an ARM926EJS (CPU Core Version 
> FEROCEON_88FR131 SOC Family: KIRKWOOD,
> KW88F6281) based board ?
> 
> 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?

BTW: What's your end use case?

Reagrds..
Prafulla . .

> 
> thanks in advance
> Heikos
> -- 
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, 
> Germany _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
> 

[U-Boot] bootcount support on arm/kirkwood

[Wolfgang Denk]

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.

> BTW: What's your end use case?

The boot counter counts the number of (failed) boot attempts (i. e. processor
resets minus one) after power on. See
http://www.denx.de/wiki/view/DULG/UBootBootCountLimit

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
PLEASE NOTE: Some Quantum Physics Theories Suggest That When the Con-
sumer Is Not Directly Observing This Product, It May Cease  to  Exist
or Will Exist Only in a Vague and Undetermined State.

[U-Boot] bootcount support on arm/kirkwood

[Prafulla Wadaskar]

 

> -----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

Regards..
Prafulla . .

[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@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
-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

[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@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
> 

[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@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

[U-Boot] bootcount support on arm/kirkwood

[Wolfgang Denk]

Dear Prafulla Wadaskar,

In message <73173D32E9439E4ABB5151606C3E19E202DD54DFCC@SC-VEXCH1.marvell.com> you wrote:
> 
> > 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

There is not  a  single  register  in  the  whole  CPU  and  all  the
peripherals  it  implements  that  keeps it's value over a reset? I'd
really be surprised if that was indeed true.

Could you please check again? Maybe ask the chip designers?

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
There are two ways to write error-free programs. Only the  third  one
works.

[U-Boot] bootcount support on arm/kirkwood

[Wolfgang Denk]

Dear Prafulla Wadaskar,

In message <73173D32E9439E4ABB5151606C3E19E202DD54DFED@SC-VEXCH1.marvell.com> you wrote:
> 
> > No chance? Is there really no register/mem array which keep 
> > its value across a processor reset?
...
> Do you want only across reboots(i.e. resets)? How about re-power cycle?

It needs to keep it's value only through resets; it is  assumed  that
power  cycling  gets  detected independently from that, in which case
this boot counter would be reset to 0.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
A Puritan is someone who is deathly afraid that  someone,  somewhere,
is having fun.