[yocto] Timestamp error between zImage & uname-a [ Yocto-2.6.1 + Qemux86 ]

[Ralph Siemsen]

Hi Ashish,

On Mon, May 13, 2019 at 5:57 AM AshishKumar Mishra <
ashish.emailaddress at gmail.com> wrote:

> So , time shown by "uname -a" is retains older value even though
> i had compiled the linux multiple times .
>

This is normal behaviour, even when building the kernel directly (eg. not
using Yocto). It is a bit surprising at first, but it all comes down to
dependencies in the Makefile for the kernel.

The version string displayed by "uname -a" comes from init/version.c in the
kernel source tree. Specifically the symbol UTS_VERSION, which is defined
in include/generated/compile.h. This file is produced when you first build,
and remains thereafter, unless you do "make clean" or equivalent.

Currently , only way i am able to bypass this behavior is to do bitbake -c
> cleanall linux-yocto
> before every compilation.
>

You can delete the include/generated/compile.h file in your kernel build
directory. Upon rebuild of kernel, the file will be re-created with the
current date/time.

Regards
Ralph
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