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gem5 graphic: --frame-capture

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Ciro Santilli
2018-06-07 10:00:23 +01:00
parent 0a04e7ba84
commit ca69691bfd
1 changed files with 22 additions and 8 deletions
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@@ -494,6 +494,26 @@ and when we connect it shows a message:
info: VNC client attached
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Alternatively, you can also view the frames with `--frame-capture`:
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./run -aa -g -L gem5-v4.15 -- --frame-capture
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This option dumps one compressed PNG whenever the screen image changes inside `m5out`, indexed by the cycle ID. This allows for more controlled experiments.
It is fun to see how we get one new frame whenever the white underscore cursor appears and reappears under the penguin.
TODO <<kmscube>> failed on `aarch64` with:
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kmscube[706]: unhandled level 2 translation fault (11) at 0x00000000, esr 0x92000006, in libgbm.so.1.0.0[7fbf6a6000+e000]
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Tested on: link:http://github.com/cirosantilli/linux-kernel-module-cheat/commit/38fd6153d965ba20145f53dc1bb3ba34b336bde9[38fd6153d965ba20145f53dc1bb3ba34b336bde9]
==== Graphic mode gem5 aarch64
For `aarch64` we also need `-c kernel_config_fragment/display`:
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@@ -509,18 +529,14 @@ git -C linux checkout -
This is because the gem5 `aarch64` defconfig does not enable HDLCD like the 32 bit one `arm` one for some reason.
===== Graphic mode gem5 internals
We cannot use mainline Linux because the <<gem5-arm-linux-kernel-patches>> are required at least to provide the `CONFIG_DRM_VIRT_ENCODER` option.
gem5 emulates the link:http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0541c/CHDBAIDI.html[HDLCD] ARM Holdings hardware for `arm` and `aarch64`.
The kernel uses HDLCD to implement the <<drm>> interface, the required kernel config options are present at: link:kernel_config_fragment/display[].
TODO <<kmscube>> failed on `aarch64` with:
....
kmscube[706]: unhandled level 2 translation fault (11) at 0x00000000, esr 0x92000006, in libgbm.so.1.0.0[7fbf6a6000+e000]
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TODO: minimize out the `-K`. If we just remove it on `arm`: it does not work with a failing dmesg:
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@@ -569,8 +585,6 @@ TODO: minimize out the `-K`. If we just remove it on `arm`: it does not work wit
So what other options are missing from `gem5_defconfig`? It would be cool to minimize it out to better understand the options.
Tested on: link:http://github.com/cirosantilli/linux-kernel-module-cheat/commit/38fd6153d965ba20145f53dc1bb3ba34b336bde9[38fd6153d965ba20145f53dc1bb3ba34b336bde9]
=== Automatic startup commands
When debugging a module, it becomes tedious to wait for build and re-type: