Run x86 on raspberry pi. /PapersPlease), it will tell you if it's 32 or 64 bit.

Run x86 on raspberry pi Compiling box86 on the Raspberry Pi requires a few packages that may not be currently installed on your system. Hi, there. Heroes of Might and Magic IV is a Windows game. We use some essential cookies to make our website work. Wed Nov 20, 2019 2:03 pm . The set resolution button is missing in the raspberry PI Configuration app. Running x86 applications on an ARM-based Windows is challenging, but there are a few workarounds: Microsoft Store: Access ARM-compatible applications from the Microsoft Store. Usual 32 bit or 64 bit Linux uses Wine to run Windows programs, but I haven't heard about running Wine for rpi4 because its cpu is arm 64 bit. In some cases you can use qemu user mode emulation to run x86 linux binaries. -DRPI4=1 With the assistance of translation layers, running Windows 64-bit x86 applications on a Raspberry Pi 4 becomes feasible. If you expect to profit from someone's you should expect to pay for them. Seriously. I had a bootable iso based on ubuntu Linux that can run on x86 processor without modifying existing OS. We will try to run an x86 application on our Raspberry Pi to ensure everything is perfect. anyone got any ideas. deb is supported) from the website or wherever you got it. It’s designed for x86 systems, so make sure you choose the right file: Code: Select all efflandt@raspberrypi ~ $ uptime 18:01:58 up 8 min, 2 users, load average: 1. Thank you. If you are following this tutorial using a I'm running the Raspberry PI Desktop x86 in a virtualised environment (Fusion on my MAC), I'm struggling to find how to change the resolution. Note: if you plan to use box86 with Wine on Raspberry Pi 3 or earlier, those models use a default OS that have a kernel with a 2/2 Split (meaning 2G of space for user program, In September, we released an update that introduced PIXEL, the Pi's new desktop environment. Because Box64 uses the native versions of some "system" libraries, like libc, libm, SDL, box86 is a userspace emulation software that allows you to run Linux x86 applications on an ARM device such as the Raspberry Pi. The first one translates Windows API calls into LINUX API calls (POSIX). I got Windows notepad. Operating system. As long as you have the right packages and software anyway. Using this software, we can run a variety of x86 software on our Raspberry Pi. Side note: the installation already takes a long time with a Raspberry Pi 4 and fast storage, so even if you can get it running on a Pi Zero with a slow SD card, keep in mind that it might take way longer to install. To remedy this we have the Box86 and Box64 compatibility layers which Note: x86 32bit applications use the new Wine WOW64 mode. Hi everyone, I'm currently doing a project in which I'm trying to run the software used for the Samsung Gear 360 on the Raspberry Pi 3 Model B. Edit: box86 does not run 64-bit x86 binary. I’ve previously built Kubernetes Clusters running on a couple of Raspberry Pi’s, built architecture Kubernetes Clusters running x86 and ARM compute. Try adding -spice port=5900,addr=0. You are trying to run an x86 file on an ARM processor. Debian, Raspberry Pi OS 64-bit Beta, LibreElec. If you type file [nameOfFileYouAreRunning] (e. jamesh Raspberry Pi Engineer & Forum Moderator Posts: 34217 Joined: Sat Jul 30, 2011 7:41 pm. We will use Zoom for this particular post. g. Wed Jul 07, 2021 11:35 pm . Thanks. 4 498212 316140 Their download page lists iOS and Android versions, which run on ARM architecture but are completely incompatible with the Raspberry Pi's hardware and Linux distributions, and they also list Linux versions, which are If you want to try running windows programs on the pi, I personnally haven't tried (but would really like to) using Qemu to run ReactOS (which is a rewrite of windows from the gro I have a self hosted Raspberry Pi server and I am looking for a way to run a tModLoader server Box64 only kick -in when running x86_64 binary. Knowledge, skills, & experience have value. Open a browser on the Raspberry Pi Browse to: https://join. I tried to run the Steam binary, hoping that x86_64 (aka amd64) is a 64 bit version of the infamous intel architecture, arm32 or arm64 are 32 and 64 bit versions of the arm architecture, but there are many sub-versions. Preparing your Raspberry Pi for Zoom. We use optional cookies, as detailed in our cookie policy, to remember your settings and understand how you use our website. To get around this, we will be using a nifty piece of software called box86. exe files. I am hoping to overcome issues with the Raspberry Pi OS when using VNC viewer. sudo reboot now Testing Box86 on the Raspberry Pi. This is where this tutorial comes in. Now scroll down to find Wine (x86) in the list. On Apple Silicon running Linux they are going to use FEX to run x86 Linux games. Box64 lets you run x86_64 Linux programs (such as games) on non-x86_64 Linux systems, like ARM (host system needs to be 64bit little-endian). I want to run a Starbound server on my Raspberry Pi running rasbian. Please contact the developers of whatever Operating System you now wish to run ! As RPT are now beta testing a 64-bit version of Raspberry Pi OS on the RaspberryPi machine, I was wondering if there are any plans to release a 64-bit userland version of the Raspberry Pi Desktop for PC and Mac? I run Raspberry Pi Desktop for PC and Mac on an old Dell laptop and it works superbly using the 64-bit kernel and the 32-bit userland Running x86 VM on Raspberry Pi 4 8GB using KVM . Hello, I would like to present a bit of a quick and dirty/hacky method of getting the desktop 64-bit version of the Zoom client working on the Raspberry Pi 4/400. Check out "3 Ways to Run x86 on Raspberry Pi" by Novaspirit Tech. exe onto my raspberry pi 3 model b but I’m having some difficulties. This Put the SD card you'll use with your Raspberry Pi into the reader and run Raspberry Pi Imager. And it always Ensuring that all drivers are up to date will minimize crashes and improve stability when using Windows on Raspberry Pi. 1. deb file and use sudo dpkg -i [file. In Windows 10, even when running command line in administrator mode, I get this Code: Select all. It enables you to run x86 applications for the x86 CPU architecture on your Raspberry Pi. And the emulation is made from an apple library, to another apple library (so the only the application code is been transcript, not a OS). A 32-bit operating system, like Raspberry Pi OS, is mandatory to follow this tutorial. Re: Box86 - Linux Userspace x86 Emulator. /PapersPlease), it will tell you if it's 32 or 64 bit. I extracted the zip files and it created the following Candle /libs LICENSE /platforms If it has been compiled for Raspberry Pi OS, try the following in a terminal: Code: it's for X86 Linux, or (2) ARM 64-bit when you are running ARM 32-bit or vice-versa. exe for windows. Before diving further. I've been at this for quite a while and I also read in the original thread that the host and guest OS should be the same version. zoom. STEP-01 Boot from DVD on a PC. Older games generally run better. Hello, I am trying to achieve the same results as you but with the most recent version of Raspbian/Debian (stretch). Help Hello. The only problem is that, unlike the AVR and PIC microcontroller boards available, Raspberry Pi typically runs an OS (like Raspbian) that distributes CPU time across all running programs and makes it impractical for certain real time applications. Then from another machine on your local network use a spice client (remote-viewer from virt-viewer package) to connect to the IP Address of the Pi using port 5900. The Raspberry Pi can do a lot of things that your PC can do – but it’s not designed to do everything. What about more modern games? Some are on Linux but only made for x86 CPUs. ExaGear Desktop - run x86 apps on Raspberry Pi pUnK from Eltechs. If you use a 64-bit version, you won’t have the option in Pi No idea what . You can do it with Wine software. Heater Posts: 19722 Joined: Tue Jul 17, 2012 3:02 pm. I think the next step would be to compile a build? But I am getting stuck here. You need a computer with an x86 processor. It’s a different file from the one you might have flashed to a microSD card to run on a physical Raspberry Pi. /. Re: How to run x86 iso on pi4. I'm mostly We use some essential cookies to make our website work. Know I have compiled and installed box64. pUnK, If you run something in a cloud you work inside virtual machine which in fact some layer of translation. Apple has likely added a proprietary instruction set to enable this. So, there are two steps. I tried both on aarch64 Gentoo and standard Raspbian. Just because it was something cool I could And the ability to run x86 games on my Pi is great! An RPi can be a gaming PC. xz to root, but installing the deb with dpkg works fine. mkdir build; cd build; cmake . Because Rosseta does not use a standard ARM instruction. 3K. Raspberry Pi 4 with Raspberry Pi OS 64 bit with WINE ARM64 to run applications Visual Studio 2022 Community Edition on a Windows PC to create the application targeting ARM64 rather than x86 I have used Visual Studio 2022 Community Edition to create a sample ARM64 application that I then ran on a Raspberry Pi 4 running Windows for ARM and that I was either running the x86 version or the 64 bit variant of the game. 0. Download for WindowsDownload for macOSDownload for Ubuntu for x86Download for WindowsDownload for macOSDownload for ExaGear Desktop - run x86 apps on Raspberry Pi pUnK from Eltechs. \msd Check the Pi has booted and running as an MSD device If successful a new removable disk should be detected by Windows File Explorer Windows may report errors with the disk but it seems that can be ignored and the Pi MSD removable disk will work despite whatever those errors are. On Raspbian it builds but then segfaults when I run it. 6GHz (on an x86 CPU) The Pi4 stock speed is 1. deb], it tells me, I need to use a x86-64 PC. cmd --help Imager: Unknown option 'help' I f I run with no options, I get this Code: Select all. pUnK wrote:Guys, you can blame me all the deadly sins for sure. 9 70. Store information; The fundamental challenge lies in the architectural differences; Raspberry Pi operates on ARM architecture, while most x86 software is designed for x86 architecture on desktops. Either way, it will not work. Wine is a compatibility layer that allows running Windows 7 applications on Linux systems which translate Windows API calls into Linux API calls on-the-fly instead of simulating internal . I'm not trying to run Windows programs, more x86_64 Linux programs. C:\Program Files (x86)\Raspberry Pi Imager>rpi-imager-cli. Before creating the virtual machine, it is necessary to have the Raspberry PI OS Desktop ISO downloaded, which you can find on the official website here. If the Pi folks want to gauge the insterest in getting Pixel running on old x86 hardware, without necessarily creating an turnkey alternative to the Pi, Raspbian Jessie on your computer | Raspberry pi | French HD". That runs only on x86 computers!” Yup. Yes, Pi-Apps suffered this problem with Steam, but it has since been fixed. Using the command in the build text file for raspberry pi 4 doesnt work. I'm not sure if your Pi has an FX 5500 or Radeon 9500 or GMA 3100, but mine sure doesn't. 0,disable-ticketing to your qemu command line which will tell qemu to open a spice listener on port 5900 on your raspberry pi. exe running on my Pi under Raspberry Pi OS after building and installing Box86 and installing the WINE intended for Twister OS - The Raspberry Pi uses an ARM processor, not an Intel x86. 3. For instance, try installing Fallout 2 on the Raspberry Pi with ExaGear: exagear wine setup_fallout_2. Therefore, you can efficiently run an application like Zoom or a game like World of Goo without glitches or errors. Currently WINE can be an emulator (and by "being an emulator", I mean running on non-x86 CPUs), sort of. Run Windows 10 or any Linux distro with the Rock Pi X. It appears that WINE on the Pi in 2012 could run apps that could run on Windows RT and Windows CE (both versions of Windows made for ARM processors), and there aren't many of those. If you have used the Raspberry Pi for some time now, you might have realized that there are Now, you can run many Windows games on the Raspberry Pi. . It never happened on Raspberry Pi OS Buster, but for some reason it does on Ubuntu (resulting in "Could not start file manager 258 no network port available" on teamspeak). As everyone knows, Raspberry Pi 4 has arm 64 bit CPUs. 18. In any case you would need to compile You wish to run x86 Windows app on ARM Linux system. Before we can compile the x86 emulatorto our Raspberry Pi, we will need to do a bit of preparation. 4) Go to C:\Program Files (x86)\Raspberry Pi 5) Run : rpiboot -d . Running Linux. This forum is specifically for Debian x86 Stretch with Raspberry Pi Desktop. Wine (x64) If you encounter any errors executing the command, reboot your Raspberry Pi. The server is built to run on an x86 architecture, so my goal is to emulate an x86 architecture to run the server. Sat May 30, 2015 1:37 pm . Read more. There are some caveats to using box86 on your Raspberry Pi. It just so happens that I have a favorite older game from the win95 era that I'd like to give a go but the typical So, after too many hours lost of my life, I finally got the portable full installation of Debian x86 with RPi to work on a 16 GB USB stick with both UEFI/EFI and BIOS/Legacy booting, and a data partition for carrying files on the USB stick, which is located at the beginning of the USB stick, and therefore pops up automatically when entered into systems already booted in Really interesting project. Is there a big diferrence between BOX86 and RPI86? Raspberry Pi Store. So let’s get started! Step 1: Install Raspberry Pi OS 64-bit Learn how to use the ExaGear Raspberry Pi emulator for Linux and Windows emulation on the Raspberry Pi! What is ExaGear? ExaGear, as the name suggests, is a virtualization method for running Intel x86 applications on Run x86 Windows apps with a box86-emulated version of x86 wine-9. They have completely different architectures and machine languages. Here’s how we put it to use. But I don’t know how to use it. T his post will guide you on running 64-bit software on the Raspberry Pi, which you know uses the ARM processor. kiwiavi So here are 3 ways you can run x86 software on your raspberry pi,one being the slowest using qemu, 2nd using chroot method to a x86 debian or ubuntu environm The Raspberry Pi uses an ARM processor, whereas DOS/Windows PCs use a 80x86 processor. There are, indeed, a lot of youtube videos showing Kali Lunix and Ubuntu on a Raspberry Pi 5. I want to make my homelab more portable, so I decided to replace my old server with Raspberry Pi 4 8GB. hortimech Posts: 1028 For most of these I have successfully run them on a Raspberry Pi using Box86 or Box64. I want to run it on wine, installed on rasbpian, but my question is "How to install wine?" I've tryed with the command "sudo apt-get install wine" and "sudo apt-get install wine-development" but there is a problem with my missing package. 1. Note: Raspberry Pi OS has 32-bit and 64-bit variants, both of which will run on most Raspberry Pi computers, including the Pi 3, Pi 4, and Pi5. Unfortunately DOS and similar software is x86, If you want x86 but with GPIO in (roughly) Raspberry Pi 4 form factor, the Radxa ROCK Pi X may still be available. exe Use Pi386, on the other hand, is a preconfigured x86 environment for the Pi which doesn't run an entire OS, but it runs i386 Debian software. Not all Windows applications will work under Wine. I give as evidence for this: The fact that Dietmar has (sort of) gotten Wine to work on the Pi. The chip that runs on raspberry pi 3 B supports the arm64 (aka armv8) architecture, but it is used in 32 bit mode (aka armv7) in the standard raspbian release. run and . The Steam deb did brick your OS when directly extracting the data. I'm trying to run Candle on my PI. 5GHz You can overclock it a bit, but that's what's needed just to run the game, without accounting for emulating an x86 Windows computer. There’s reason to believe this might change since Apple’s new chips are ARM-based and that will surely push adoption forward. You should then see the A Raspberry Pi4 is a great little single-board computer but since it’s ARM-based, it cannot run x86 and x86_64 applications. The free DVD bundled with the print edition of The MagPi #60 can be used to start up a PC or Mac computer with an optical DVD drive. In this comprehensive guide, I‘ll demonstrate installing Box86 from source on Raspberry Pi OS and outline steps for optimizing performance when running x86 apps. The folks at ExaGear were kind enough to send us a free product key. Raspberry Pi Engineer & Forum Moderator Posts: 317 Joined: Fri May 24, 2019 2:10 pm Location: Cambridge UK. That means many GitLab CI builds will fail since the Docker images might only be available for x86. Box86 is an emulation software that converts x86 instructions to the ARM instruction set that the Raspberry Pi understands. Running an x86 program that needs DirectX support on Raspberry Pi. This software allows us to emulate the 32-bit x86 architecture on our Raspberry Pi, allowing us to run the SteamCMD tool, which we can use to download the Palworld server. I've have over 200+ games running on my pi 4 largely thanks to box86 being able to run x86 linux and wine. If you download something like that you have to make sure it's for ARM, Devs will normally mention Raspberry Pi explicitly. Wine (x86) (x86). It can even do dynamic recompilation rather than just using an interpreter, giving you a 5-10x speed boost. ARM is RISC and x86 is CISC architectures so there could be some race conditions due to another way of parallelization of instructions as well as memory protection and management. Difference between x86/x64 and ARM. As above stated you need a x86 CPU [whatever the current official name for the version of a Raspbian-like OS that runs on X86 is] on it, but I'm not convinced) Anyway, ignore the last two points. bin files are, but they are most likely made for X86 (Intel) processors. Just before Christmas, we released a version of the OS that runs on x86 PCs, so now you can install it on your PC, Mac, or laptop. file . Wine won't run native X86 apps on the Pi, it needs processor emulations as well, so Have you ever wanted to run something on your Raspberry Pi but it was only made for x86 processors? Box86 (https://adafru. 5. Currently, I have a couple of vms running on KVM and I'm wondering if I will be able to run them on Raspberry. QEMU on Pi can easy do arm and aarch64. Box86 is here to solve that, providing fast, dynamic recompilation of x86 binaries into ARM. This perplexes me, since Tom's Hardware (a reputable tutorial website) recommended the manual decompression of the data. I'm trying to run a x86 windows program using wine and box86 but because I'm new to raspberry pi os, I'm getting stuck quite quickly. it/-Bg) solves that and lets you run x86 Linux binaries on your ARM system - Pi, ODroid, OpenPandora, etc. klricks Posts: 8928 The only issue is that the control software is only avaliable for Windows and macOS systems running 64-bit x86 architectures. This is all thanks to Raspbian has become Raspberry Pi Operating System and will only run on the Raspberry Pi SBC & Compute Module. Complex answer: You can use an emulator to make the RaspPi pretend to be an x86. Advantages of Windows 10 on ARM64 on Raspberry Pi 3 - Windows on Windows - Lets you run 32-bit Windows applications seamlessly on ARM64. Box86 lets you run x86 Linux programs (such as games) on non-x86 Linux systems, like ARM (host system needs to be 32bit little-endian). This supported software includes applications like Zoom or games like World of Goo. To do so, I tried using box86. EDIT: I was also made aware of this proprietary solution that claims to make it possible running x86 binaries on ARM systems, but all demonstrations are for ARM v7 systems, not sure if it will work on Raspbian with a Raspberry Pi B+ I'd like to experiment using the Raspberry Pi for some different low level embedded applications. But Download whatever program you need (from what I know, only tar. Any ideas for Eee PC running Raspberry Pi Desktop? Thu Oct 04, 2018 1:20 am . How to run the x86_64 build of Zoom on a Raspberry Pi 400. It may also provide a way to run Android Studio, which is still broken on arm64 Linux. Which isn't the case for Raspberry pi 3 version provided by mikerr (it runs stretch host with wheezy guest), I don't The Raspberry Pi Desktop x86 DVD; The Raspberry Pi Desktop x86 ISO image file; USB thumb drive; How to: Use The Raspberry Pi Desktop x86. jamesh Raspberry Pi Engineer & Forum Moderator Posts: 34167 Joined: Sat Jul 30, 2011 7:41 pm. Running x86 on Raspberry Pi. hippy Posts: 17935 Joined: Fri Sep 09, 2011 10:34 pm and probably not going to run an X86_64 linux binary. And it absolutely works. Re: Are you able to run x86_64 programs on ARM64? The Pi – 15 Jun 17 How to run x86 programs on the Raspberry Pi - The Pi. Let’s get a good understanding of the difference between x86/x64 and ARM CPU architectures. So let’s get started! Step 1: Install Raspberry Pi OS 64-bit What is the best way to run X86 linux programs on the PI 4 with flawless compatibility? I tried BOX86 but it doesn't work for some games that work flawlessly on an x86 operating system. tar. I am looking to purchase a Raspberry Pi 5 which I will run headless. I'm not sure if this is possible, but any clarification would be nice. I've done Chroot on x86 based ChromeOS, but never tried on Raspberry Pi or ARM. First launch Pi-Apps from your start menu: Then click on the Tools category, which leads to the Emulation category. It allowed to run a x86 program (steamcmd the program that allowed me to download the In a comment to another question about Windows, somebody brought up a good point, Raspberry Pis have the horsepower to run older games. Can i run mentioned iso on raspberry pi 4 in any way? Cloudcentric Posts: 1277 Joined: Fri Sep 14, 2012 9:13 am. With the assistance of translation layers, running Windows 64-bit x86 applications on a Raspberry Pi 4 becomes feasible. https: (32 bit) software, I (and others) can recommend box86, which allows ARM computers sch as Raspberry Pi Engineer & Forum Moderator Posts: 34227 Joined: Sat Jul 30, 2011 7:41 pm. I downloaded box86 through the github link and the git command. When I have a . Same source. This incompatibility means that without special methods or software, x86 applications cannot run natively on Raspberry Pi, necessitating emulation or similar solutions. The first is that it can only run x86 applications. But what you can do is launching your shell script using the "uname trick", and let box64 run the x86_64 binary automaticaly (if it was installed properly and system-binfmt restarted The ARM operating system is Raspbian running on a Raspberry Pi B+ board and the binaries are here. To ensure we have an up-to-date package list and are working off the latest packages, lets first See more By using ExaGear, a paid program, we can emulate an x86 environment and run Windows applications like Skype, Spotify, and uTorrent. Running Windows Applications on Raspberry Pi 5. “A Raspberry Pi 3? That’s an ARM computer. us Zoom does not offer ARM binaries for Linux, only x86. Thu Jan 11, 2018 10:45 pm . Sun Sep 12, 2021 11:42 am . Doesn't even have an equivalent or better either. xz archive to /. Chris301197 wrote:Hi, I've puchased the raspberry pi 2 some days ago, and I need to run an application . On aarch64 Gentoo it fails to build. 59 efflandt@raspberrypi ~ $ free total used free shared buffers cached Mem: 448996 317948 131048 0 10012 52680 -/+ buffers/cache: 255256 193740 Swap: 102396 0 102396 efflandt@raspberrypi ~ $ ps aux | grep java efflandt 2280 98. The clock speed is 1. Last edited by thagrol on Tue Jun 14, 2022 10:17 pm, edited 1 time in total. Running Zoom on the Raspberry Pi is not straightforward because it does not have any ARM binaries. Re: How to run run . Re: Raspberry Pi 4 and QEMU (x86/x64) Thu Aug 19, 2021 12:01 pm . In short, the QEMU from the Raspberry Pi 4 from aptitude repositories are completely broken So if I want to run an x86 distro under pi 4 with Qemu I need to use x86 Qemu? Gavinmc42 Posts: 8272 Joined: Wed Aug 28, 2013 3:31 am. Raspberry Pi OS has 32-bit and 64-bit variants, both of which will run on most Raspberry Pi computers, including the Pi 3, Pi 4, and Pi5. 85, 1. people test out the software then report back to the forums tell anyone about how the software runs, An x86 CPU in a board the of a Raspberry Pi. It works quite well, slow disk bandwidth of the Pi such a solution to run x86 apps on a Pi will be unusably slow, if it can be made to work at all. It's a good idea to check online if your program can run, or if Box64 lets you run x86_64 Linux programs (such as games) on non-x86_64 Linux systems, like ARM (host system needs to be 64bit little-endian). If it can run on a simple DOS computer, it should be able to run on a single-board computer like Pi. Mon Feb 29, 2016 9:01 pm . Yes it is in French, but hamdygital has added English subtitles making it easy to follow. I am familar with Ubuntu via a virtual machine in VMware Workstation Pro. Software built for 64-bit will not run at all. 21, 0. Turn off your computer and insert the DVD. I just tried to run it on my Pi 3. The biggest downside to running on Raspberry Pi right now is the fact that it runs on ARM. Up to this point, we have successfully installed Box86 on our system. Re: Running x86 apps on ARM. gz and . Pi386, however, lets you run 32-bit x86 software on your Pi, including WINE. Rock Pi X: An x86 Computer in Raspberry Pi Form Factor : Read more But note that you still need Box86 (and a 32-bit chroot) to run x86 binaries (as it also happens on actual x86_64 Linux that need x86 libs and binary on multiarch to run). qemu-i386-static translates x86 code to ARM code, making applications run on the Pi as if they were running natively. I’m trying to run PokerStars UK. Run Steam, Wine, and more! Raspberry Pi use ARM-type processors and in general you should understand that x86 and arm instructions are have a lot of architecture differences. (And you can too with my Pi-Apps tool) The Raspberry Pi is an excellent platform for gaming, with support for tons of retro system emulators and tools like DOSBox. The Pi has Squid (Squid) November 2, 2019, Hey and sorry for late reply! I also played around with my RP3 B+ today using 64 bit Ubuntu Server and noticed the same. The WOW64 mode allows for running x86 Windows applications on x86_64 without any x86 Linux userspace. tnjmg ocbto zhvl toua iqrduy qvrygam boof tkhjpunt ghmrxa bdtocsa