buildroot-armv7 | configuration files and Buildroot external tree
kandi X-RAY | buildroot-armv7 Summary
kandi X-RAY | buildroot-armv7 Summary
This is a work in progress, it is fully usable and runs correctly, but documentation is still incomplete. Buildroot-armv7 is a Docker image (in wich Buildroot is not included), a set of scripts, configuration files and Buildroot external tree to easily setup an emulation environment where to run, debug and reverse engineer the Netgear DVA 5592 router executables. This environment uses Docker, Buildroot and Qemu to build a root file system and emulate a board with an ARMv7 Cortex A9 processor, a quite old Linux kernel, version 3.4.11-rt19 with appropriate patches, uClibc 0.9.33.2, and old versions of other libraries.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of buildroot-armv7
buildroot-armv7 Key Features
buildroot-armv7 Examples and Code Snippets
Community Discussions
Trending Discussions on Simulation
QUESTION
I try to do a power simulation with an outcome variable that is zero-inflated. So I use a negative binomial distribution. What I need is the following distribution:
...ANSWER
Answered 2022-Apr-14 at 12:54The problem is that in your lambda function, you are not using the argument names for rnbinom
. The default order for the arguments if you don't name them is n, size, prob, mu
, so you are passing 2000 to n
, 25 to size
and 0.9 to prob
. Just name the arguments explicitly as you did in your first example, and your code will work.
QUESTION
For example, I want to randomly line the 0, 1 (50% respectively) 10 times. So, there should be five "0" and five "1".
But, when I used:
...ANSWER
Answered 2022-Mar-20 at 21:16You need to use sample()
, but this way:
QUESTION
I was simulating the solar system (Sun, Earth and Moon). When I first started working on the project, I used the base units: meters for distance, seconds for time, and metres per second for velocity. Because I was dealing with the solar system, the numbers were pretty big, for example the distance between the Earth and Sun is 150·10⁹ m.
When I numerically integrated the system with scipy.solve_ivp
, the results were completely wrong. Here is an example of Earth and Moon trajectories.
But then I got a suggestion from a friend that I should use standardised units: astronomical unit (AU) for distance and years for time. And the simulation started working flawlessly!
My question is: Why is this a generally valid advice for problems such as mine? (Mind that this is not about my specific problem which was already solved, but rather why the solution worked.)
...ANSWER
Answered 2021-Jul-25 at 07:42Most, if not all integration modules work best out of the box if:
- your dynamical variables have the same order of magnitude;
- that order of magnitude is 1;
- the smallest time scale of your dynamics also has the order of magnitude 1.
This typically fails for astronomical simulations where the orders of magnitude vary and values as well as time scales are often large in typical units.
The reason for the above behaviour of integrators is that they use step-size adaption, i.e., the integration step is adjusted to keep the estimated error at a defined level. The step-size adaption in turn is governed by a lot of parameters like absolute tolerance, relative tolerance, minimum time step, etc. You can usually tweak these parameters, but if you don’t, there need to be some default values and these default values are chosen with the above setup in mind.
DigressionYou might ask yourself: Can these parameters not be chosen more dynamically? As a developer and maintainer of an integration module, I would roughly expect that introducing such automatisms has the following consequences:
- About twenty in a thousand users will not run into problems like yours.
- About fifty a thousand users (including the above) miss an opportunity to learn rudimentary knowledge about how integrators work and reading documentations.
- About one in thousand users will run into a horrible problem with the automatisms that is much more difficult to solve than the above.
- I need to introduce new parameters governing the automatisms that are even harder to grasp for the average user.
- I spend a lot of time in devising and implementing the automatisms.
QUESTION
I try adding a new variable that has an association with the previous one. Is there a math/code trick/formula to increase the width of confidence bands in this association?
...ANSWER
Answered 2022-Mar-12 at 16:34Something like this ?
QUESTION
i made a function in unity that takes a Binode - and making it into a2d tree, but here the problem: my so called idea to display the tree is this:
make a recursive function, and every time the level will go up by 1, and it will also send the function a bool(is the right or is the left of the old node) and then if its true it will get the root of the tree and - the y by level * 55, then it will either x = level * 55, if it right, and if its left the x = level * -55.
now the problome is lets say i have a tree that has 3 levels, then if i will put a right node to the left tree it will just put it were the most right node is and it will overlap, kinda hard to explain in text but i hope you understand.
heres the repository: git
code:
...ANSWER
Answered 2022-Mar-01 at 13:03Before giving an answer here I would once again first suggest some refactors and fixes:
First of all your CreateRndTree
is wrong ;)
QUESTION
In my model I use a transporter which uses free navigation. If it is right, the transporters can not move through walls, the strange thing is that in my model at one point somehow the transporter is able to move through a wall?
He slips through the wall somewhere at the red circled section, when I check the simulation. (see screenshot, blue is the transporter)
When I look at the model, I also see that there is no gap or something (see second image). Am I'm overlooking something (maybe something about that I've multiple floors)? or is it a bug? Does somebody know how to fix it.
...ANSWER
Answered 2022-Feb-10 at 15:17For other people facing this problem, when having a low turn radius (0.01) and no speed limit near obstacle in your transporterfleet, it is possible to move through walls, if you change this the problem is solved!
QUESTION
I'm having difficulty finding the documentation I need to work with Resources and resourcePools - there is no "resource API documentation" that I can find.
I would like to programatically create static resources (of a custom type) and then add these resources to a resourcePool. When creating the resources, I'd like to be able to specify their property values prior to adding them to the resourcePool. In my mind the code would look something like this:
...ANSWER
Answered 2021-Sep-20 at 07:03This is a bit of a blind spot in AnyLogic. It can only be done indirectly:
- Create an empty agent population with your agent type
- Tell the resource pool to use that agent type
- set the resource pool capacity as you need. The pool will create agents for your in that population (if the capacity is larger than the current number of resources)
If you want to manually create a resource, you must call myResourcePool.set_Capacity(myResourcePool.getCapacity()+1)
Destroying 1 resource works vice-versa.
Also, make sure to "destroy resources on capacity decrease" so the agents are destroyed from the population
QUESTION
I've got another small issue with AnyLogic resources.
I want to be able to release a specific resource from a resource pool - not just any resource from the pool. The reason is that I occasionally seize multiple resources from a ResourcePool (one at a time) and then wish to release the resources again one at a time. But I don't want to release "any" resource from the pool, I want to be able to specify which specific resource of the pool to release.
Is this possible or is this one of the limitations of the resources implementation?
...ANSWER
Answered 2021-Sep-21 at 03:21I can think of many ways to do this depending on the situation... first one is to use a selectOutput before the release in order to release or not. The selectOutput will check if it's the right resource to release
the other option, if you want to release everything with the same release block but in a given order, you can put a wait block before the release block and wait for the right moment to release the resource
another one, is to use wrap up actions, and put a wait block in the wrap up, to wait for the other resources to arrive there before releasing so they are released in order
QUESTION
I would like to use transporters in my model in various places (tugboats, forklifts, reach stackers, trucks, etc.). However, my model paths and animation can't be drawn to scale, detailed explanation in brackets below. Is there a way I can move the transporter from one node to another based on travel time (similar to what a movable resource can do), rather than speed and distance? The "Move By Transporter" block does not seem to allow this and I have not been able to find a solution online. Thank you for your help.
(Explanation on why I can't draw to scale: firstly, some destination locations (storage areas, etc.) are not known yet and will just be represented by a travel delay to get there, secondly, different areas of the model will be drawn to different scales, i.e. some network paths will represent a multiple kilometers and some network paths will only represent a few hundred meters, etc.)
...ANSWER
Answered 2022-Jan-31 at 05:24You can draw the paths to suit your animation and then simply set the speed of the transporter that gets seized to a speed so that the duration of the movement matches what you need it to be, and when the transporter gets released set the speed back to normal
QUESTION
I collect various data in time plots. If I copy the timeplot data and then paste it into Excel, the number format is often wrong. For example, I often get a date like Aug 94 instead of the actual number from the TimePlot. Unfortunately, I can't easily format this date into a number either, since the formatted number does not match the actual number from the timeplot. If I format the date in the same format as the number above and below, then I get the number 34547. However, this number does not correspond to the actual number of the TimePlot. Anyone know how I can prevent this problem?
...ANSWER
Answered 2022-Jan-17 at 19:41You can only solve this on the Excel side, AnyLogic provides the raw data for you. Excel then interprets stuff. You can test it by pasting the chart raw data into a txt or csv file.
So either fix your Excel settings or paste into a csv, then into an xlsx.
Or better still: Do not manually paste at all. Instead, write your model results into the AnyLogic database and export to Excel from there: this takes away a lot of the pain for you. Check the example models to learn how to do that.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install buildroot-armv7
install Docker, this guide, or similar guides, can be useful
add your username to the docker group with a command similar to the following (can be different in some Linux distributions): $ sudo adduser *yourusername* docker
install Qemu, using something similar to the following commands: $ sudo apt-get install qemu qemu-block-extra qemu-kvm qemu-slof qemu-system \ qemu-system-arm qemu-system-common qemu-system-mips qemu-system-misc \ qemu-system-ppc qemu-system-s390x qemu-system-sparc qemu-system-x86 \ qemu-user qemu-user-binfmt qemu-utils
install Binwalk, using something similar to the following commands: $ sudo apt-get install binwalk
install Jefferson, following instructions on the GitHub repository
download this project with command similar to the followings: valerio@ubuntu-hp:~$ mkdir br # configuration script will create folders here valerio@ubuntu-hp:~$ cd br valerio@ubuntu-hp:~/br$ git clone https://github.com/digiampietro/buildroot-armv7.git buildroot-armv7
type the following commands, the br-armv7-config.sh script will download Buildroot, Linux kernel, router firmware and will configure the environment valerio@ubuntu-hp:~/br$ cd buildroot-armv7 valerio@ubuntu-hp:~/br/buildroot-armv7$ ./br-armv7-config.sh
download the docker image from the Docker repository valerio@ubuntu-hp:~/br/buildroot-armv7$ docker pull digiampietro/buildroot-armv7
run the docker image, it is based on the old Debian Wheezy to run the old buildroot-2014-02; the current username and home directory are mapped inside the docker host. Inside the docker host the command prompt has changed, the hostname now is BRHOST: valerio@ubuntu-hp:~/br/buildroot-armv7$ cd docker/ valerio@ubuntu-hp:~/br/buildroot-armv7/docker$ ./dockrun.sh valerio@BRHOST:~$ cd ~/br/buildroot-armv7
run the Buildroot make using the brmake shell script that sets the BR2_EXTERNAL environment variable to use a customized buildroot external tree: valerio@BRHOST:~/br/buildroot-armv7$ ./brmake dvaemu-emu_arm_vexpress_defconfig valerio@BRHOST:~/br/buildroot-armv7$ ./brmake # takes a loooong time
at the end of the buildroot process a root file system image has been built, ready to be used by Qemu, running outside the docker machine: valerio@BRHOST:~/br/buildroot-armv7$ exit root@BRHOST:/src/misc# exit valerio@ubuntu-hp:~/br/buildroot-armv7/docker$ cd ../qemu-run/ valerio@ubuntu-hp:~/br/buildroot-armv7/qemu-run$ ./qr ... reeing init memory: 160K smsc911x 4e000000.ethernet: eth0: SMSC911x/921x identified at 0xc08c0000, IRQ: 47 Welcome to Buildroot buildroot login: root root@buildroot:~# uname -a Linux buildroot 3.4.11-rt19 #1 SMP PREEMPT Fri Sep 28 18:46:38 UTC 2018 armv7l GNU/Linux root@buildroot:~#
an ARM virtual machine is now available to run debug and reverse engineer the most interesting router executables. The router root file system has been included in the ARM image in the folder /dva-root, the firmware files and file system images are included in the folder /dva-firm: root@buildroot:~# ls /dva-root/ bin dev.tar.gz mnt sbin usr data etc proc sys var dev lib root tmp www root@buildroot:~# ls /dva-firm/ DVA-5592_A1_WI_20180405.sig root-fs.bin boot-fs.bin set-nandsim.sh
to exit from the Qemu virtual machine you can type # halt and then press Ctrl-A followed by the key X
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page