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gem5: aarch64 graphic mode works

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build: allow passing extra kernel config fragment with -c.
Old -c was renamed to -C, and old -C to -f.
This commit is contained in:
Ciro Santilli
2018-05-19 09:38:49 +01:00
parent d9df5f97fd
commit de9223c03d
4 changed files with 73 additions and 26 deletions
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52
README.adoc
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@@ -297,6 +297,7 @@ More concretely:
....
git checkout gem5-arm
./build -aa -lg -K linux/arch/arm/configs/gem5_defconfig
./run -aa -gu
....
and then on another shell:
@@ -305,15 +306,30 @@ and then on another shell:
vinagre localhost:5900
....
TODO: without the `-K` it fails even though we have added to link:kernel_config_fragment/default[] on the branch:
The port `5900` is incremented by one if you already have something running on that port: `gem5` stdout tells us the right port on stdout as:
....
CONFIG_DRM=y
CONFIG_DRM_HDLCD=y
CONFIG_DRM_VIRT_ENCODER=y
system.vncserver: Listening for connections on port 5900
....
so what other options are missing from `gem5_defconfig`? The failing dmesg is:
aarch64:
....
./build -aA -lg -K linux/arch/arm64/configs/gem5_defconfig -c kernel_config_fragment/gem5-aarch64-hdlcd
./run -aA -gu
....
We need the extra config fragment because the gem5 aarch64 defconfig does not enable HDLCD like the 32 bit one for some reason.
TODO: without the `-K`:
....
git checkout gem5-arm
./build -aa -lg -c kernel_config_fragment/gem5-aarch64-hdlcd
./run -aa -gu
....
it does not work with a failing dmesg:
....
[ 0.121078] [drm] found ARM HDLCD version r0p0
@@ -325,6 +341,8 @@ so what other options are missing from `gem5_defconfig`? The failing dmesg is:
[ 0.121197] hdlcd: probe of 2b000000.hdlcd failed with error -12
....
So what other options are missing from `gem5_defconfig`? It would be cool to minimize it out to better understand the options.
=== Automatic startup commands
When debugging a module, it becomes tedious to wait for build and re-type:
@@ -2222,7 +2240,7 @@ TODO we were not able to get it working yet: https://stackoverflow.com/questions
=== Linux kernel configuration
==== Use your own kernel config
==== Modify kernel config options
By default, we use a `.config` that is a mixture of:
@@ -2237,14 +2255,24 @@ If you want to just use your own exact `.config` instead, do:
Beware that Buildroot can `sed` override some of the configurations we make no matter what, e.g. it forces `CONFIG_BLK_DEV_INITRD=y` when `BR2_TARGET_ROOTFS_CPIO` is on, so you might want to double check as explained at <<find-the-kernel-config>>. TODO check if there is a way to prevent that patching and maybe patch Buildroot for it, it is too fuzzy. People should be able to just build with whatever `.config` they want.
==== Modify a config option
Only effective for the current build:
Modify a single option:
....
./build -c 'CONFIG_FORTIFY_SOURCE=y' -l
./build -C 'CONFIG_FORTIFY_SOURCE=y' -l
....
Use an extra kernel config fragment file:
....
printf '
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
' > myconfig
./build -c 'myconfig' -l
....
`-K`, `-c`, `-C` can all be used at the same time. Options passed via `-C` take precedence over `-c`, which takes precedence over `-K`.
==== Find the kernel config
Ge the build config in guest:
@@ -3003,7 +3031,7 @@ TODO: can you get function arguments? https://stackoverflow.com/questions/276087
==== Kprobes
....
./build -c 'CONFIG_KPROBES=y'
./build -C 'CONFIG_KPROBES=y'
./run -F 'insmod /kprobe_example.ko && sleep 4 & sleep 4 &'
....
@@ -3282,7 +3310,7 @@ Make it harder to get hacked and easier to notice that you were, at the cost of
Enable:
....
./build -c 'CONFIG_FORTIFY_SOURCE=y'
./build -C 'CONFIG_FORTIFY_SOURCE=y'
....
Test it out: