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updated buildroot make procedure to incorporate configs more robustly

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bbracker 2021-07-13 12:40:14 -04:00
parent 99587f58f7
commit 3565580f40
3 changed files with 32 additions and 13 deletions
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1
.gitignore vendored
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@ -30,5 +30,6 @@ wally-pipelined/linux-testgen/x*
!wally-pipelined/linux-testgen/linux-testvectors/tvLinker.sh
wally-pipelined/linux-testgen/buildroot/
wally-pipelined/linux-testgen/buildroot-image-output
wally-pipelined/linux-testgen/buildroot-config-src/main.config.old
wally-pipelined/regression/slack-notifier/slack-webhook-url.txt

41
wally-pipelined/linux-testgen/WALLY-README.txt
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@ -8,31 +8,46 @@ you'll need to build the new Linux image, simulate it, and parse its output,
as described below.
*To build a new Linux image:
1. Git clone the Buildroot repository to ./buildroot.
1. Git clone the Buildroot repository to ./buildroot:
git clone https://github.com/buildroot/buildroot.git
For reference, Wally (*** will) be proven to work on an image built using
Buildroot when the following was the most recent commit to the Buildroot repo:
commit 4047e10ed6e20492bae572d4929eaa5d67eed746
Author: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Date: Wed Jun 30 06:27:10 2021 +0200
2. Then hard link ./buildroot-config-src/main.config to ./buildroot/.config.
That config file will in turn point to the other config files in ./buildroot-config-src.
3. If you wish to modify the configs, then in ./buildroot:
2. If you wish to modify the configs, then in ./buildroot:
a. Run "make menuconfig" or "make linux-menuconfig" or "make busybox-menuconfig".
b. For linux-menuconfig and busybox-menuconfig, use the TUI (terminal UI) to load in
configs from "../../../../buildroot-config-src/<linux or busybox>.config"
We have to tell make to go back up several dirs because for linux and busybox,
make traverses down to ./buildroot/output/build/<linux or busybox>.
b. Use the TUI (terminal UI) to load in the existing configs.
For menuconfig, you can load in the source file from
"../buildroot-config-src/main.config"
For linux-menuconfig or busybox-menuconfig, load in from
"../../../../buildroot-config-src/<type>.config"
because for linux and busybox, make traverses down to
./buildroot/output/build/<linux or busybox>.
One annoying thing about the TUI is that if it has a path already loaded,
then before you can enter the new path to buildroot-config-src, you need to
delete the existing one from the textbox. Doing so requires more than backspace.
Once you've deleted as much of the existing path as you can see, arrow left to
check if there is more text you need to delete.
c. Likewise, when you are done editing, tell the TUI to save to the same location.
4. Then finally you can run make. Note that it may be necessary to rerun make twice,
once when main.config asks for an "Image" output, and once when main.config
"vmlinux" output.
3. Finally go to ./buildroot-config-src and run make-buildroot.sh.
This script copies ./buildroot-config-src/main.config to ./buildroot/.config
and then invokes make. This is clumsy but effective because buildroot
sometimes does weird things to .config, like moving it to .config.old and
making a new .config -- doing so can really mess up symbolic/hard links.
4. If you'd like debugging symbols, then reconfigure Buildroot to output "vmlinux"
and run make-buildroot again.
*To generate new RAMs and testvectors from a Linux image:
1. sym link ./buildroot-image-output to either your new image in ./buildroot/output/image
or the existing image at /courses/e190ax/buildroot/output/image on Tera.
or the existing image at /courses/e190ax/buildroot-image-output on Tera.
This might require first deleting the empty buildroot-image-output directory.
2. Then run ./testvector-generation/logBuildrootMem.sh to generate RAMs.
3. Then run ./testvector-generation/logAllBuildroot.sh to generate testvectors.

3
wally-pipelined/linux-testgen/buildroot-config-src/make-buildroot.sh Executable file
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@ -0,0 +1,3 @@
cp main.config ../buildroot/.config
cd ../buildroot
make