From 975ce0723ee3fa1fea1766e6683e2f3acb8558d6 Mon Sep 17 00:00:00 2001 From: Ciro Santilli Date: Sun, 3 Jun 2018 16:44:42 +0100 Subject: [PATCH] arm graphic mode: document better drm console --- README.adoc | 49 +++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 39 insertions(+), 10 deletions(-) diff --git a/README.adoc b/README.adoc index 0a3ac4e..8a9075a 100644 --- a/README.adoc +++ b/README.adoc @@ -388,13 +388,31 @@ flooding the screen with colors. See also: https://superuser.com/questions/22309 ==== Graphic mode arm +===== Graphic mode arm terminal + +TODO: on arm, we see the penguin and some boot messages, but don't get a shell at then end: + .... -./run -aa -x +./run -a aarch64 -x .... -Outcome: a window opens, and you see the penguin, and some boot messages there, but don't get a shell there, only on the host terminal. +I think it does not work because the graphic window is <> only, i.e.: -TODO: how to get a shell on that graphic window? +.... +cat /dev/urandom > /dev/fb0 +.... + +fails with: + +.... +cat: write error: No space left on device +.... + +and has no effect, and the Linux kernel does not appear to have a built-in DRM console as it does for fbdev with <>. + +There is however one out-of-tree implementation: <>. + +===== Graphic mode arm terminal implementation `arm` and `aarch64` rely on the QEMU CLI option: @@ -3410,6 +3428,7 @@ Maybe some brave soul will send a pull request one day. === Linux kernel interactive stuff +[[fbcon]] ==== Linux kernel console fun Requires <>. @@ -3432,7 +3451,7 @@ Relies on: `CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y`. Documented under: `Documentation/fb/`. -TODO: font and keymap. Mentioned at: https://cmcenroe.me/2017/05/05/linux-console.html and I think can be done with Busybox `loadkmap` and `loadfont`, we just have to understand their formats, related: +TODO: font and keymap. Mentioned at: https://cmcenroe.me/2017/05/05/linux-console.html and I think can be done with BusyBox `loadkmap` and `loadfont`, we just have to understand their formats, related: * https://unix.stackexchange.com/questions/177024/remap-keyboard-on-the-linux-console * https://superuser.com/questions/194202/remapping-keys-system-wide-in-linux-not-just-in-x @@ -3803,11 +3822,6 @@ to see multiple `/dev/dri/cardN`, and then use a different display with: ./run -F '/libdrm_modeset.out' -x .... -Ubuntu 18.04 host attempts: - -* https://github.com/dvdhrm/kmscon/issues/113 `driver does not support dumb buffers`. Same for: https://github.com/dvdhrm/docs/blob/fad7c3203b14e67053e0fc41d8490138b8ff47dd/drm-howto/modeset.c It seems that the NVIDIA graphic card takes over. -* https://github.com/Aetf/kmscon/issues/2#issuecomment-392484043 - Bibliography: * https://dri.freedesktop.org/wiki/DRM/ @@ -3864,6 +3878,20 @@ failed to initialize legacy DRM Tested on: 2903771275372ccfecc2b025edbb0d04c4016930 +==== kmscon + +TODO get working. + +Implements a console for <>. + +The Linux kernel has a built-in fbdev console: <> but not for <> it seems. + +The upstream project seems dead with last commit in 2014: https://www.freedesktop.org/wiki/Software/kmscon/ + +Build failed in Ubuntu 18.04 with: https://github.com/dvdhrm/kmscon/issues/131 but this fork compiled but didn't run on host: https://github.com/Aetf/kmscon/issues/2#issuecomment-392484043 + +Haven't tested the fork on QEMU too much insanity. + ==== libdri2 TODO get working. @@ -6686,7 +6714,8 @@ Lenovo ThinkPad link:https://www3.lenovo.com/gb/en/laptops/thinkpad/p-series/P51 * Intel Core i7-7820HQ Processor (8MB Cache, up to 3.90GHz) (4 cores 8 threads) * 32GB(16+16) DDR4 2400MHz SODIMM * 512GB SSD PCIe TLC OPAL2 -* Ubuntu 17.10 +* NVIDIA Quadro M1200 Mobile, latest Ubuntu supported proprietary driver +* Latest Ubuntu === Benchmark Internets