[U-Boot] About the CRC of u-boot.bin

[U-Boot] About the CRC of u-boot.bin

[Peter Pan]

I found out that even with the same source code, the final u-boot.bin
has a different MD5sum each time I build.
Is that possible to get an identical u-boot.bin for the same source
code, no matter when I build?

[U-Boot] About the CRC of u-boot.bin

[Wolfgang Denk]

Dear Peter Pan,

In message <BANLkTiknD3J66KeKHXDv8eRB7STQyGbnBQ@mail.gmail.com> you wrote:
> I found out that even with the same source code, the final u-boot.bin
> has a different MD5sum each time I build.
> Is that possible to get an identical u-boot.bin for the same source
> code, no matter when I build?

No, as the image contains a time stamp that changes each time you
build a new image.

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
Steal five dollars and you were a petty  thief.  Steal  thousands  of
dollars and you are either a government or a hero.
                                   - Terry Pratchett, _Going_Postal_

[U-Boot] About the CRC of u-boot.bin

[Mike Frysinger]

On Saturday, June 11, 2011 02:55:41 Wolfgang Denk wrote:
> Peter Pan wrote:
> > I found out that even with the same source code, the final u-boot.bin
> > has a different MD5sum each time I build.
> > Is that possible to get an identical u-boot.bin for the same source
> > code, no matter when I build?
> 
> No, as the image contains a time stamp that changes each time you
> build a new image.

i wonder if we should make this a config tweak.  some people (not really 
myself) would like to be able to confirm the same result every time and the 
timestamp is an acceptable loss ...
-mike
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[U-Boot] About the CRC of u-boot.bin

[Peter Pan]

Our product is used in a safety-critical situation. We want to make
sure that the product we released is exactly the one we tested in our
labs.
Because our product is released in a checkout-build-release process,
it is impossible to just give out the binary file we tested.

Maybe there is a workaround to solve this problem.

2011/6/12 Mike Frysinger <vapier@gentoo.org>:
> On Saturday, June 11, 2011 02:55:41 Wolfgang Denk wrote:
>> Peter Pan wrote:
>> > I found out that even with the same source code, the final u-boot.bin
>> > has a different MD5sum each time I build.
>> > Is that possible to get an identical u-boot.bin for the same source
>> > code, no matter when I build?
>>
>> No, as the image contains a time stamp that changes each time you
>> build a new image.
>
> i wonder if we should make this a config tweak. ?some people (not really
> myself) would like to be able to confirm the same result every time and the
> timestamp is an acceptable loss ...
> -mike
>

[U-Boot] About the CRC of u-boot.bin

[Wolfgang Denk]

Dear Peter Pan,

In message <BANLkTikd2r_g1WVrMe7_M7nD-xR3X-F7zg@mail.gmail.com> you wrote:
> Our product is used in a safety-critical situation. We want to make
> sure that the product we released is exactly the one we tested in our
> labs.

In this case you must make sure to ship exactly the same binary image
that was used during testing.  You must not test oneiomage, then
rebuild and ship the new (untested) one.

> Because our product is released in a checkout-build-release process,
> it is impossible to just give out the binary file we tested.

I cannot parse this.

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
Vor allem kein Gedanke! Nichts ist kompromittierender als ein  Gedan-
ke!            - Friedrich Wilhelm Nietzsche _Der Fall Wagner_ (1888)

[U-Boot] About the CRC of u-boot.bin

[Andreas Bießmann]

Dear Peter Pan,

Am 13.06.2011 um 06:17 schrieb Peter Pan:

> Our product is used in a safety-critical situation. We want to make
> sure that the product we released is exactly the one we tested in our
> labs.

> Because our product is released in a checkout-build-release process,
> it is impossible to just give out the binary file we tested.

Why don't you just test the binary that was built for release?

> 2011/6/12 Mike Frysinger <vapier@gentoo.org>:
>> On Saturday, June 11, 2011 02:55:41 Wolfgang Denk wrote:

>>> No, as the image contains a time stamp that changes each time you
>>> build a new image.
>> 
>> i wonder if we should make this a config tweak.  some people (not really
>> myself) would like to be able to confirm the same result every time and the
>> timestamp is an acceptable loss ...

The build-timestamp is an quite usable parameter, if it is configurable it should be opt-out.

When I looked for the char *version_string I found out this is defined in respective architecture board.c. Shouldn't this be defined somewhere else to have always the same string?

regards

Andreas Bie?mann

[U-Boot] About the CRC of u-boot.bin

[Jon Povey]

u-boot-bounces at lists.denx.de wrote:
> Our product is used in a safety-critical situation. We want to make
> sure that the product we released is exactly the one we tested in our
> labs. Because our product is released in a checkout-build-release
> process, it is impossible to just give out the binary file we tested.

I am pretty sure I saw some patches for Linux within the last couple
of months that make this a config option for the kernel for the same
kind of reasons. Maybe good for inspiration.

Sorry, but I can't remember exactly when, or if they got into mainline.

Seems like a good option to have, though.

--
Jon Povey
jon.povey at racelogic.co.uk

Racelogic is a limited company registered in England. Registered number 2743719 .
Registered Office Unit 10, Swan Business Centre, Osier Way, Buckingham, Bucks, MK18 1TB .

The information contained in this electronic mail transmission is intended by Racelogic Ltd for the use of the named individual or entity to which it is directed and may contain information that is confidential or privileged. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email so that the sender's address records can be corrected. The views expressed by the sender of this communication do not necessarily represent those of Racelogic Ltd. Please note that Racelogic reserves the right to monitor e-mail communications passing through its network

[U-Boot] About the CRC of u-boot.bin

[Peter Pan]

OK, I will try to find that Linux patch and see how it goes.

And, first of all, I will suggest my manager to change the
checkout-build-release process. I also agree that just release the
binary we tested is a much better way.

Thank you guys.


2011/6/13 Jon Povey <Jon.Povey@racelogic.co.uk>:
> u-boot-bounces at lists.denx.de wrote:
>> Our product is used in a safety-critical situation. We want to make
>> sure that the product we released is exactly the one we tested in our
>> labs. Because our product is released in a checkout-build-release
>> process, it is impossible to just give out the binary file we tested.
>
> I am pretty sure I saw some patches for Linux within the last couple
> of months that make this a config option for the kernel for the same
> kind of reasons. Maybe good for inspiration.
>
> Sorry, but I can't remember exactly when, or if they got into mainline.
>
> Seems like a good option to have, though.
>
> --
> Jon Povey
> jon.povey at racelogic.co.uk
>
> Racelogic is a limited company registered in England. Registered number 2743719 .
> Registered Office Unit 10, Swan Business Centre, Osier Way, Buckingham, Bucks, MK18 1TB .
>
> The information contained in this electronic mail transmission is intended by Racelogic Ltd for the use of the named individual or entity to which it is directed and may contain information that is confidential or privileged. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email so that the sender's address records can be corrected. The views expressed by the sender of this communication do not necessarily represent those of Racelogic Ltd. Please note that Racelogic reserves the right to monitor e-mail communications passing through its network
>
>
>

[U-Boot] About the CRC of u-boot.bin

[Mike Frysinger]

On Monday, June 13, 2011 04:11:57 Andreas Bie?mann wrote:
> The build-timestamp is an quite usable parameter, if it is configurable it
> should be opt-out.

goes without saying

> When I looked for the char *version_string I found out this is defined in
> respective architecture board.c. Shouldn't this be defined somewhere else
> to have always the same string?

feel free to submit a patch.  there is a lot of logic in arch/*/lib/board.c 
that should be unified.

also, please fix your e-mail client to properly wrap long lines
-mike
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