[U-Boot-Users] sypcr double written

[U-Boot-Users] sypcr double written

[Antonio Di Bacco]

I saw that in cpu_init_f the sypcr is written and it is also written in the 
init of wdt_mpc8xx.o but this should not be possible according to the MPC885 
Reference Manual.

For sure there is an explanation for this, anyone knows?

Bye,
Antonio.

[U-Boot-Users] sypcr double written

[Wolfgang Denk]

In message <200605232124.05181.antonio.dibacco@aruba.it> you wrote:
> I saw that in cpu_init_f the sypcr is written and it is also written in the 
> init of wdt_mpc8xx.o but this should not be possible according to the MPC885 
> Reference Manual.

It is not possible, but then: what's wdt_mpc8xx.o? This is  not  part
of U-Boot.

> For sure there is an explanation for this, anyone knows?

Um... and if you're talking about any Linux kernel code  -  who  says
that  it's been booted by U-Boot, or that the boot loader initialized
the SYPCR?

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Plan to throw one away. You will anyway."
                              - Fred Brooks, "The Mythical Man Month"

[U-Boot-Users] sypcr double written

[Antonio Di Bacco]

wdt_mpc8xx.c is in the kernel, in the drivers/char/wdt_mpc8xx.c

On Tuesday 23 May 2006 22:31, Wolfgang Denk wrote:
> In message <200605232124.05181.antonio.dibacco@aruba.it> you wrote:
> > I saw that in cpu_init_f the sypcr is written and it is also written in
> > the init of wdt_mpc8xx.o but this should not be possible according to the
> > MPC885 Reference Manual.
>
> It is not possible, but then: what's wdt_mpc8xx.o? This is  not  part
> of U-Boot.
>
> > For sure there is an explanation for this, anyone knows?
>
> Um... and if you're talking about any Linux kernel code  -  who  says
> that  it's been booted by U-Boot, or that the boot loader initialized
> the SYPCR?
>
> Best regards,
>
> Wolfgang Denk

[U-Boot-Users] sypcr double written

[Jerry Van Baren]

Antonio Di Bacco wrote:
> wdt_mpc8xx.c is in the kernel, in the drivers/char/wdt_mpc8xx.c
> 
> On Tuesday 23 May 2006 22:31, Wolfgang Denk wrote:
>> In message <200605232124.05181.antonio.dibacco@aruba.it> you wrote:
>>> I saw that in cpu_init_f the sypcr is written and it is also written in
>>> the init of wdt_mpc8xx.o but this should not be possible according to the
>>> MPC885 Reference Manual.
>> It is not possible, but then: what's wdt_mpc8xx.o? This is  not  part
>> of U-Boot.
>>
>>> For sure there is an explanation for this, anyone knows?
>> Um... and if you're talking about any Linux kernel code  -  who  says
>> that  it's been booted by U-Boot, or that the boot loader initialized
>> the SYPCR?
>>
>> Best regards,
>>
>> Wolfgang Denk

Well, strictly speaking it _is_ possible to write the SYPCR more than 
once, it just doesn't do anything because the CPU ignores all but the 
first write.  Whatever wdt_mpc8xx.o writes is ignored in this case.

Best regards,
gvb

P.S. Please don't top post.

[U-Boot-Users] sypcr double written

[Wolfgang Denk]

In message <200605232240.05529.antonio.dibacco@aruba.it> you wrote:
> wdt_mpc8xx.c is in the kernel, in the drivers/char/wdt_mpc8xx.c

So what has this to do with U-Boot?


PLEASE STOP TOP-POSTING / FULL-QUOTING!!!!


Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Ada is PL/I trying to be Smalltalk.                 - Codoso diBlini

[U-Boot-Users] Re: sypcr double written

[antonio.dibacco]

Wolfgang Denk Scrive:

> In message <200605232240.05529.antonio.dibacco@aruba.it> you wrote:
>> wdt_mpc8xx.c is in the kernel, in the drivers/char/wdt_mpc8xx.c
> 
> So what has this to do with U-Boot? 
> 
> 
> PLEASE STOP TOP-POSTING / FULL-QUOTING!!!! 
> 
> 
> Wolfgang Denk 
> 
> -- 
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> "Ada is PL/I trying to be Smalltalk.                 - Codoso diBlini 
> 
> 
> -------------------------------------------------------
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I discovered a possible problem, just at the beginning, when the environment 
is not setup and thus ethaddr and eth1addr are not set, I call saveenv two 
times consecutively without resetting the watchdog. Probably the watchdog 
lasts for one saveenv but not for two consecutive saveenv. 

Thank you,
Antonio. 

[U-Boot-Users] Re: sypcr double written

[Wolfgang Denk]

In message <20060524115904.7705.qmail@mx1.aruba.it> you wrote:

[Completely irrelevant full quote deleted]

Antonio, will you *please*  finally  read  the  netiquette  and  stop
full-quoting? Thanks!

> I discovered a possible problem, just at the beginning, when the environment 
> is not setup and thus ethaddr and eth1addr are not set, I call saveenv two 
> times consecutively without resetting the watchdog. Probably the watchdog 
> lasts for one saveenv but not for two consecutive saveenv. 

It should not matter how often you call it. If  the  watchdog  resets
here, then you have a bug in your flash driver.

Let me guess: you don't use the CFI driver, but your own custom code?
And you don't use udelay() for delays?

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Marriage is like a cage; one sees the birds outside desperate to get
in, and those inside desperate to get out."               - Montaigne

[U-Boot-Users] Re: sypcr double written

[antonio.dibacco]

I hope this is not full quote! Below there is only what you have written.

I don't use any custom driver, I think the u-boot probes for the flash type 
and uses what is better. Anyway in saveenv I didn't see any 
WATCHDOG_RESET(). 

Furthermore I will do the same test on a evaluation board that for sure 
works and I will try to do several saveenv. 

Bye,
Antonio. 


Wolfgang Denk Scrive: 

> It should not matter how often you call it. If  the  watchdog  resets
> here, then you have a bug in your flash driver. 
> 
> Let me guess: you don't use the CFI driver, but your own custom code?
> And you don't use udelay() for delays? 
> 
> Best regards, 
> 
> Wolfgang Denk 
> 
> -- 
> Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> "Marriage is like a cage; one sees the birds outside desperate to get
> in, and those inside desperate to get out."               - Montaigne
 

[U-Boot-Users] Re: sypcr double written

[Wolfgang Denk]

In message <20060524135205.2982.qmail@mx1.aruba.it> you wrote:
> I hope this is not full quote! Below there is only what you have written.

It's even worse.It's a top post / fuull quote again.

PLEASE READ THE NETIQUETTE! This is tha last time I  ask  you  to  do
this,  and  to play by the rules. If you continue to ignore the rules
and post such unreadable messages I will just ignore  your  postings.
Don't expect any more help from me then.

> I don't use any custom driver, I think the u-boot probes for the flash type 
> and uses what is better. Anyway in saveenv I didn't see any 
> WATCHDOG_RESET(). 

"U-Boot" does not probe anything. It's the  flash  driver  in  U-Boot
that  deals with flash, and my question was which one you use. Sorry,
but if you cannot even answer this question, then I have  no  way  of
helping you anyway.



Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
They weren't that important. They were merely at the top. The  people
who  really  run organizations are usually found several levels down,
where it's still possible to get things done.
                                      - Terry Pratchett, _Small Gods_

[U-Boot-Users] Re: sypcr double written

[Antonio Di Bacco]

> It's even worse.It's a top post / fuull quote again.
>
> PLEASE READ THE NETIQUETTE! ......

I didn't mean to hurt you, what I did was not by intention. I have a great 
esteem for you, for what you do and an example to follow for me. 
Now I read something about how awful is top-posting. I will always answer 
inline.

> "U-Boot" does not probe anything. It's the  flash  driver  in  U-Boot
> that  deals with flash, and my question was which one you use. ...

This is my first experience with u-boot and linux. I know that some questions 
are annoying. Anyway I didn't choose any flash driver. My u-boot 
configuration file: include/configs/MYBOARD.h doesn't contain anything about 
a possible flash driver then I believe that a CFI driver is being used. I'm 
going to put a trace inside WATCHDOG_RESET() just to see if it is being 
called.

Sorry again,
Bye,
Antonio.

[U-Boot-Users] Re: sypcr double written

[Wolfgang Denk]

In message <200605252139.24859.antonio.dibacco@aruba.it> you wrote:
> 
> This is my first experience with u-boot and linux. I know that some questions 
> are annoying. Anyway I didn't choose any flash driver. My u-boot 
> configuration file: include/configs/MYBOARD.h doesn't contain anything about 
> a possible flash driver then I believe that a CFI driver is being used. I'm 

No. In this case a proprietary flash driver is being  used.  And  you
should  know  this, as you must have put a file board/MYBOARD/flash.c
in your board specific directory, and you must have  adapted  it  for
your hardware, so your eally should remember.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
In a business, marketroids, salespukes, and  lawyers  have  different
goals from those who actually do work and produce something. Usually,
is  is the former who triumph over the latter, due to the simple rule
that those who print the money make the rules.
         -- Tom Christiansen in <5jdcls$b04$2@csnews.cs.colorado.edu>