users September 2017

users@lists.genode.org

16 participants
21 discussions

SDIO Interface for SDCard
by George Joseph 25 Sep '17

25 Sep '17

Hi, I was trying to understand the sdio interfacing. Then I looked into the sdcard driver written for imx6. I was able to successfully built and run it on the platform. When I looked deeper into the code I see the sd host controller interface is written part of sd card driver. I was confused ,shouldn't the sdio driver including the DMA support be a independent service than coupled with a user space sd card service? Since sdio can be used for interfacing other modules like wireless,audio,etc, I believe it should be part of the core modules. I may be wrong about this. I would like to do the whole the sdio interfacing in Genode.More help will be appriciated. :) Thanks for the help Regards George +91-7674068356

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Custom InputMethod for QtVirtualKeyboard
by Johannes Kliemann 21 Sep '17

21 Sep '17

Hi Christian, I tried to implement a custom InputMethod for the QtVirtualKeyboard. But I couldn't find any useful information on how to do this. Beside the Technical Guide [1] for the keyboard there seems to be no documentation on how to do this. I have implemented my custom InputMethod class in QML (based on the example) but I failed to find any useful information on how to activate it. The part Activating an Input Method [2] is not helpful at all since it only links to the class references of the InputEngine (which neither explain where or how to use the custom class). Do you have any idea? Regards, Johannes [1]: https://doc.qt.io/qt-5/technical-guide.html [2]: https://doc.qt.io/qt-5/technical-guide.html#activating-an-input-method

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i.MX6 Wand-Quad drivers
by Steven Harp 15 Sep '17

15 Sep '17

Hello: What is the current scope of driver support in Genode 17.08 for the peripheral devices on the Wand-Quad board? - Ethernet (Atheros)? - USB controllers? - Wi-Fi (Broadcom)? - Bluetooth (Broadcom)? - Vivante GPUs / framebuffer? - SDIO? - GPIO? Anybody currently working on these?

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cli_monitor vs launcher vs launchpad
by Jörg-Christian Böhme 08 Sep '17

08 Sep '17

My setup/environment: - Source: Branch: staging commit 17f3b559735027bcbde233ebacbb1f9d173a566c Date: Thu Aug 3 09:44:17 2017 -0500 - Target-genode-System: nova x86_64 - Host-System: genode-x86-gcc (GCC) 6.3.0 Ubuntu 17.04 QEMU emulator version 2.8.0(Debian 1:2.8+dfsg-3ubuntu2.3) Hi, I try to understand the difference between cli_monitor, launcher, launchpad and qt-launchpad. I looked into the source code and I understand following: - app/cli_monitor is the command line version to start child processes. It exists in the low-level OS components repo. - app/launcher is the UI version of cli_monitor and uses some headers from cli_monitor. It exists in the gems repo. - app/launchpad is the UI version to start child processes. Launchpad is not using the cli_monitor headers. It exists in the demo repo. - app/qt5/qt_launchpad is the Qt version of launchpad. It uses lib/launchpad from demo repo. It exists in the libports repo. Both cli_monitor headers and lib/launchpad using the Genode::Child and Genode::Child_policy API to managed the child compoments as described in section 8.17.2. Child management [1]. What I see between the cli_monitor/launcher and launchpad approach, that the configuration of the subsystems is different. But is there even more differences ? May I asked, what are the future plans of these "launchers"? Cli_monitor is in the OS repo and sounds like the API is what I should use to implement some "own" launchers. Launch app in gems repo, as what I understand from the email from Norman (see Friday, 4. August 2017 11:56:38 CEST from Norman Feske) this is outdated. Launchpad is in the demo repo and what I see in the git commit history, this is also the older approach to "launch" subsystems in genode, or? Here some background information, why I asked... I will use genode as a desktop system and for such a use case I need something to launch applications. I notice, that genode is currently implementing a package management and it sounds like for me, in the future I need a launcher that are flexible enough to start an application after I installed a package in genode :-) ... but step by step. I'm a C++ developer and using STL/boost etc. but for UI I use Qt/QML. The idea, I will try to develope a launcher in Qt/QML (I know there is a launchpad in Qt ... but not in QML). I still try to find out, which approach is the best: Use the lib/launchpad or cli_monitor API or develope from scratch as described in section 8.17.2. Child management [1]. Maybe I will still using the current aprroaches (launchpad etc.), it depends on the email reply :-) Cheers, Jörg [1] http://genode.org/documentation/genode-foundations-17-05.pdf

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Qt5 QInputMethod
by Johannes Kliemann 07 Sep '17

07 Sep '17

Hi Christian, while working with the QtVirtualKeyboard, I noticed that I can attach a QInputMethod directly to the keyboard which is a much cleaner solution than using a hidden input field. As far as I understood it, it is required to create a custom implementation of QInput(Method|Engine|Context) (like it is done in qtbase/src/plugins/plastforms). What do you think is the best approach to implement this part? I though about either doing it directly in the keyboard application (which might be more portable) or adding it to the nitpicker integration in /qt5/qtbase/src/plugins/platforms/nitpicker (which would make it accessible for more applications). Regards, Johannes

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MuPDF fails
by Alexander Senier 07 Sep '17

07 Sep '17

Hi all, when running the mupdf demo on base-linux/x86_64 (make run/mupdf), I get the following error: genode build completed using 'core-linux' as 'core' using 'ld-linux.lib.so' as 'ld.lib.so' using 'linux_timer_drv' as 'timer' spawn ./core Genode 17.08 17592186044415 MiB RAM and 8998 caps assigned to init [init] child "timer" announces service "Timer" [init -> fb_sdl] creating virtual framebuffer for mode 1024x768@...487... [init] child "fb_sdl" announces service "Framebuffer" [init] child "fb_sdl" announces service "Input" [init -> mupdf] Error: libc suspend() called from non-user context (0x1180506) - aborting [init] child "mupdf" exited with exit value 1 An alternative PDF file made no difference, the same happens on base-nova. I tested with Genode 17.08. Any ideas? Cheers, Alex

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Predefined window position
by Alexander Senier 07 Sep '17

07 Sep '17

Hi all, I want to set a fixed position for windows on startup. My scenario uses the floating_window_layouter just like run/mixer_gui_qt_test. According to gems/src/app/floating_window_layouter/README, this should be as easy as adding a policy line to the layouters config. In the mixer_gui_qt_test I added: <start name="layouter"> <binary name="floating_window_layouter"/> <resource name="RAM" quantum="4M"/> <config> <policy label_prefix="mixer_gui_qt" xpos="300" ypos="300"/> </config> <route> ... Unexpectedly, when I run it the window is created as position (0,0). What's the right way to set the position of a window? Also, I was wondering whether there is a way to set the dimension of a Qt window without changing the application? Thanks! Cheers, Alex

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Affinity Subspace Mapping
by Lex, Stephan 06 Sep '17

06 Sep '17

I am working with affinities in order to start and bind various components on different cores. I am using QEMU as emulation platform to start the system with four cores. My situation looks as follows: I have one parent component which creates two more children. Each of these including the init component should be assigned to a different core. The idea was to start init with an affinity configuration 4x1 in the run script: => <affinity-space width="4" height="1"/> The custom parent component should be configured to get a affinity subspace of 3x1 beginning from the second core like: => <affinity xpos="1" ypos="0" width="3" height="1"/> The next idea was to create two affinities with a subspace of 1x1 for the two children and start them within the parent component. The two children should be working on the third and fourth core respectively, so my intention was to declare them as xpos 1 and 2 relative to the parents subspace of 3x1: => const Genode::Affinity &aff_count{Genode::Affinity::Space(1), Genode::Affinity::Location(1, 0)}; => const Genode::Affinity &aff_val{Genode::Affinity::Space(1), Genode::Affinity::Location(2, 0)}; To check this attempt i inserted a log call in the constructor of core's Cpu_session_component: => log("CORE ",__func__,": Affinity location: xpos: ",_location.xpos()," ypos: ",_location.ypos()," width: ",_location.width()," height: ",_location.height()); The log outputs seem relatively coherent with what was originally planned: => init cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 0 ypos: 0 width: 4 height: 1" => parent cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 1 ypos: 0 width: 3 height: 1" => child_1 cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 2 ypos: 0 width: 3 height: 1" => child_2 cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 3 ypos: 0 width: 3 height: 1" Unfortunately right after the second child gets started, the program loops and does not terminate. If i change the affinity for the children to => const Genode::Affinity &aff_count{Genode::Affinity::Space(1), Genode::Affinity::Location(0, 0)}; => const Genode::Affinity &aff_val{Genode::Affinity::Space(1), Genode::Affinity::Location(1, 0)}; the log outputs also change to => child_1 cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 1 ypos: 0 width: 3 height: 1" => child_2 cpu_session: "CORE Cpu_session_component: Affinity location: xpos: 2 ypos: 0 width: 3 height: 1" and the program continues its work as intended. If you could tell me my thinking errors, if there are any, or how to achieve that each component gets assigned to their respective cores, i would appreciate it a lot. -- Thank you, Stephan Lex

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Genode on Odroid XU4
by Hornemann Steve 04 Sep '17

04 Sep '17

Hey Guys, I'm really happy opening my first discussion. :D I take part on a research by using Genode on Odroid_xu4. Had some problems creating images but I got one for XU3, created as "uimage" put on SD-Card. Now I have several information: https://github.com/genodelabs/genode/issues/991, not understand,yet. https://sourceforge.net/p/genode/mailman/message/31693682/, think the next steps. And https://en.wikipedia.org/wiki/ODROID in which Genode is declared as "NO" in working as OS with XU4. In Wikipedia-Talk I questioned it. I hope, somebody can give a clear answer for that. Also I believe, Yevgeny made good work, but more I want to know, why he interrupted the project. Well, after connecting this is my first Issue :D, This is the first statement from XU4 via "gtkterm" connected UART: U-Boot 2012.07-00036-g4d29c46-dirty (Dec 04 2015 - 15:52:26) for Exynos5422 CPU: Exynos5422 Rev0.1 [Samsung SOC on SMP Platform Base on ARM CortexA7] APLL = 800MHz, KPLL = 800MHz MPLL = 532MHz, BPLL = 825MHz Board: HardKernel ODROID DRAM: 2 GiB WARNING: Caches not enabled TrustZone Enabled BSP BL1 version: ï¿½/ï¿½ï¿½ VDD_KFC: 0x44 LDO19: 0xf2 Checking Boot Mode ... SDMMC MMC: S5P_MSHC2: 0, S5P_MSHC0: 1 MMC Device 0: 14.8 GiB MMC Device 1: 29.1 GiB MMC Device 2: MMC Device 2 not found there are pending interrupts 0x00000001 *** Warning - bad CRC, using default environment In: serial Out: serial Err: serial Net: No ethernet found. Press quickly 'Enter' twice to stop autoboot: 0 Unable to use mmc 0:1 for fatload Unknown command 'ext4load' - try 'help' Unknown command 'ext4load' - try 'help' Load Boot Script from mmc 0:1 <<< Unable to use mmc 0:1 for fatload Load Boot Script from mmc 0:2 <<< Unable to use mmc 0:2 for fatload Run Default Bootcmd <<< reading kernel..device 0 Start 1263, Count 16384 MMC read: dev # 0, block # 1263, count 16384 ... 16384 blocks read: OK completed reading RFS..device 0 Start 17647, Count 2048 MMC read: dev # 0, block # 17647, count 2048 ... 2048 blocks read: OK completed Bad Linux ARM zImage magic! Sorry for missing information for better understanding the Issue. May I can complete them next time. Thanks for any help! Steve

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need help to understand piece of the doc
by Naiji Ma 01 Sep '17

01 Sep '17

Hi everybody, I would like to quote part of the official doc from [1]: *As illustrated in the figure, from an organizational point of view, a virtual machine is implemented as a leaf node in Genode's process tree. Genode not only facilitates the use of virtual machines for application compatibility but also the re-use of existing device drivers. The baby Tux in the figure symbolizes an original Linux device driver being executed in a device-driver environment.* [1] http://genode.org/documentation/general-overview/index How to understand the 're-use' ? Does it mean that an original(unmodified) Linux device driver could be placed into a 'device-driver environment' and also function correctly in Genode, or does it mean an original Linux device driver could be taken out from the Linux virtual machine (the big Tux) and executed as a leaf node in Genode, consequently serve Genode as well as the big Tux at the same time? Regards, Naiji

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users September 2017