[U-Boot] SWUpdate - U-Boot environment library dependency
Andreas Reichel
andreas.reichel.ext at siemens.com
Tue Sep 4 10:30:00 UTC 2018
Hi all,
as Stefano Babic was so friendly and pointed out a few things already,
we come the following problematic points:
For SWupdate to access U-Boot's environment, it uses code from U-Boot.
Before 2015, fw_env.c was copied - hence out of version control,
afterwards and since then, a lib.a produced by U-Boot has been used
and renamed to libubootenv.a to link against.
However, this approach creates several difficulties:
* Distros like Debian cannot provide a devel package for SWUpdate like
u-boot-dev, since U-Boot has its default environment code compiled
board-dependently and Debian needed it board-independent.
If a board-independent libubootenv.a was provided without
a specific default environment, the first update process would destroy
the U-Boot environment if it had had bad CRC before.
(Thanks Stefano for this good point).
* If we have a board with U-Boot already preinstalled and want to
compile SWUpdate for it, we need the sources of this very U-Boot to
get the propper lib. For example in a debian-like build system we had to
compile U-Boot again, although it is already installed since we lack
a dev package.
* U-Boot does not provide any default means to install a development
library. Thus anything we modify on-top might break with the next
version.
First proposal by Stefano and me would be to somehow split the default
environment from the library to have a board-independent component and
board specific data that is passed to U-Boot and SWUpdate somehow.
Goal is to factor out U-Boot environment support for other software like
SWUpdate and not patching and hacking like its the case with recipes as in
openembedded atm.
Thanks,
Andreas
--
Andreas Reichel
Dipl.-Phys. (Univ.)
Software Consultant
Andreas.Reichel at tngtech.com, +49-174-3180074
TNG Technology Consulting GmbH, Betastr. 13a, 85774 Unterfoehring
Geschaeftsfuehrer: Henrik Klagges, Dr. Robert Dahlke, Gerhard Mueller
Sitz: Unterfoehring * Amtsgericht Muenchen * HRB 135082
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