[U-Boot-Users] lkc support for U-Boot My $0.02 worth
rod_boyce at stratexnet.com
Fri Nov 8 16:58:52 CET 2002
What you are forgetting is there the list of supported board currently in
U-Boot are not all the configurations available. There are configurations
that make Wolfgang's example look very simple that are not released back to
U-Boot for one reason or another.
The flash sector that holds our environment variables in our flash is 128K.
I know that I am going to have to add whatever configuration mechanism you
add to our close source boards and this is my problem and I've hacked the
kernel config files about enough to do this but I still say...
If it isn't broke why fix it.
From: Holger Schurig [mailto:h.schurig at mn-logistik.de]
Sent: Thursday, November 07, 2002 11:25 PM
To: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] lkc support for U-Boot My $0.02 worth
> I still see technical issues; for example, I have not the slightest
> idea how longish definitions like:
Not at all. However, I have the feeling that they are not that common. Only
some board has this here and then.
But those long stuff could stay in the *.h file, if needed.
char "kernel environment settings"
and in include/config/special_board.h
#define CONFIG_EXTRA_ENV_SETTINGS \
"ten " \
"thousand " \
> I fear that adding new features will become much harder, as you'll
> have to continually extend the config setup.
For me it looks EASIER. A complete description of what is configurable is in
the config.in files. Right now, I have to do things like
grep '^#if' `find -name '*.c'` | sort | unique
to find out what is actually configurable. And then it's only slightly
documented, and dependencies are not laid out clearly.
> And finally - has
> anybody benchmarked the speed of such a new config scheme?
I doubt there is much difference... once you've run make
config|xconfig|oldconfig|menuconfig, you have to files. One is includeable
"Makefile"s, the other one into C programs.
You simply include this and that's it. I can't see why this should slowdown
the compilation process.
One thing that might be a little time difference is the
cp board/<boardname>/def-configs .config
However, running "make oldconfig" on the current Bitkeeper tree of
www.openzaurus.org is negligible:
/usr/src/buildroot-oz# touch packages/config.in
/usr/src/buildroot-oz# touch .config
/usr/src/buildroot-oz# times make oldconfig
0.22user 0.09system 0:00.32elapsed 94%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (5351major+2500minor)pagefaults 0swaps
But then again the combined length of all config.in of this project is only
754 lines with now only 202 configurable variables (I have an 850 MHz AMD
with 1967 bogomips and the hard disk cache was "warm").
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