"error: invalid arch-independent ELF magic" and "error: you need to load the kernel first" While Booting On UEFI BIOS System

[DarkOutcast6]

Area of Cosmos - What area of Cosmos are we dealing with?

While booting my Cosmos OS ISO file onto my MacBook (running on UEFI BIOS System) using release configuration and VMWARE.

Expected Behaviour - What do you think that should happen?

I am able to successfully boot my OS.

Actual Behaviour - What unexpectedly happens?

It is stuck in a loop saying "error: invalid arch-independent ELF magic" and "error: you need to load the kernel first" while trying to boot the OS from the GRUB menu.

Reproduction - How did you get this error to appear?

Build the ISO file using VMWARE setting on the release configuration (not debug!)

Version - Were you using the User Kit or Dev Kit? And what User Kit version or Dev Kit commit (Cosmos, IL2CPU, X#)?

User Kit in C#

[GoldenretriverYT]

Then your macbook doesnt support x86, it as easy as that. Not a bug.

Well, let me correct: Most likely doesnt support x86 cause you didnt specify anything other than "macbook", which is not very precise considerering there are 18 years of macbooks. If you are 100% sure it supports x86, then well, tell us more about it

[DarkOutcast6]

Ha, good point. It’s a MacBook Pro 2012. Know any way to check if it supports x86?

[GoldenretriverYT]

yeah thats odd those are intel based so they should support x86 unless they are locked down to like x86_64

[GoldenretriverYT]

you could try installing the devkit since it uses limine instead of grub, maybe that works

[DarkOutcast6]

Got it. What is the difference between x86_64 and x86 in this situation, then?

EDIT: How can I port my Userkit program to devkit, then?

[GoldenretriverYT]

Got it. What is the difference between x86_64 and x86 in this situation, then?

well, they are essentially the same but x86_64 is newer and obviously has some changes, but you should usually be able to run an x86 OS regardless.

[GoldenretriverYT]

EDIT: How can I port my Userkit program to devkit, then?

Well you just need to install the devkit, thats about it. There arent a ton of breaking changes but you might have to adjust your code a bit

[DarkOutcast6]

After I install the devkit, in what way might I change my code to work? Is there any differences for actually building an ISO image and booting it on a UEFI BIOS?

---

By the way, this is my current code:

using System;
using Sys = Cosmos.System;

namespace CosmosKernel1
{
    public class Kernel : Sys.Kernel
    {

        protected override void BeforeRun()
        {
            Console.Clear();
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine(" ~ Welcome to Telehack OS! ~ ");
            Console.Write("It is " + DateTime.Now.ToString("h:mm tt") + " on " + DateTime.Now.ToString("M/d/yyyy") + ".");
            Console.WriteLine(@"
 _____________________
| list time info calc | 
| clear date restart  |
| shutdown pi         |
|_____________________|");
            /*Console.ReadKey();*/
        }

        protected override void Run()
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.Write("\n> ");
            var input = Console.ReadLine();
            if (input == "list")
            {
                Console.WriteLine(@"
 _____________________
| list time info calc | 
| clear date restart  |
| shutdown pi         |
|_____________________|");
            }
            else if (input == "help")
            {
                Console.WriteLine(@"Enter a command to learn what it does: ");
                var command = Console.ReadLine();
                if (command == "list")
                {
                    Console.WriteLine("Shows all of the commands.");
                }
                else if (command == "time")
                {
                    Console.WriteLine($"{command} - Shows the current time.");
                }
                else if (command == "info")
                {
                    Console.WriteLine($"{command} - Shows device info.");
                }
                else if (command == "calc")
                {
                    Console.WriteLine($"{command} - A basic caculator.");
                }
                else if (command == "clear")
                {
                    Console.WriteLine($"{command} - Clears the command line.");
                }
                else if (command == "date")
                {
                    Console.WriteLine($"{command} - Shows the current date.");
                }
                else if (command == "restart" || command == "reboot")
                {
                    Console.WriteLine($"{command} - Restarts the machine.");
                }
                else if (command == "shutdown" || command == "shut down")
                {
                    Console.WriteLine($"{command} - Restarts the machine.");
                }
                else if (command == "pi")
                {
                    Console.WriteLine($"{command} - Recites 50 trillion digits of pi (.");
                }
                else
                {
                    Console.WriteLine("No command with the name of \"" + command + "\"!");
                }
            }
            else if (input == "time")
            {
                Console.WriteLine(DateTime.Now.ToString("h:mm:ss tt"));
            }
            else if (input == "clear")
            {
                Console.Clear();
            }
            else if (input == "date")
            {
                Console.WriteLine(DateTime.Now.ToString("M/d/yyyy"));
            }
            else if (input == "info")
            {
                Console.WriteLine($"Manufacturer: N/A");
                Console.WriteLine($"Model: N/A");
                Console.WriteLine($"Storage Total: N/A");
                Console.WriteLine($"Storage Left: N/A");
                Console.WriteLine($"Memory: N/A");
            }
            else if (input == "calc")
            {
                /*var toCalc = Console.ReadLine();
                Console.WriteLine(@toCalc);*/
                string toCalc = "1+1";
                try
                {
                    double equation = Convert.ToDouble(toCalc);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.ToString());
                }
                /*Console.WriteLine($"{equation}");*/
                /*Console.WriteLine($"{toCalc} = {equation}");*/
            }
            else if (input == "shutdown" || input == "shut down")
            {
                Cosmos.System.Power.Shutdown();
            }
            else if (input == "reboot" || input == "restart")
            {
                Cosmos.System.Power.Reboot();
            }
            else if (input == "pi")
            {
                Console.WriteLine("3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593344612847564823378678316527120190914564856692346034861045432664821339360726024914127372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160943305727036575959195309218611738193261179310511854807446237996274956735188575272489122793818301194912983367336244065664308602139494639522473719070217986094370277053921717629317675238467481846766940513200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892354201995611212902196086403441815981362977477130996051870721134999999837297804995105973173281609631859502445945534690830264252230825334468503526193118817101000313783875288658753320838142061717766914730359825349042875546873115956286388235378759375195778185778053217122680661300192787661119590921642019893809525720106548586327886593615338182796823030195203530185296899577362259941389124972177528347913151557485724245415069595082953311686172785588907509838175463746493931925506040092770167113900984882401285836160356370766010471018194295559619894676783744944825537977472684710404753464620804668425906949129331367702898915210475216205696602405803815019351125338243003558764024749647326391419927260426992279678235478163600934172164121992458631503028618297455570674983850549458858692699569092721079750930295532116534498720275596023648066549911988183479775356636980742654252786255181841757467289097777279380008164706001614524919217321721477235014144197356854816136115735255213347574184946843852332390739414333454776241686251898356948556209921922218427255025425688767179049460165346680498862723279178608578438382796797668145410095388378636095068006422512520511739298489608412848862694560424196528502221066118630674427862203919494504712371378696095636437191728746776465757396241389086583264599581339047802759009946576407895126946839835259570982582262052248940772671947826848260147699090264013639443745530506820349625245174939965143142980919065925093722169646151570985838741059788595977297549893016175392846813826868386894277415599185592524595395943104997252468084598727364469584865383673622262609912460805124388439045124413654976278079771569143599770012961608944169486855584840635342207222582848864815845602850601684273945226746767889525213852254995466672782398645659611635488623057745649803559363456817432411251507606947945109659609402522887971089314566913686722874894056010150330861792868092087476091782493858900971490967598526136554978189312978482168299894872265880485756401427047755513237964145152374623436454285844479526586782105114135473573952311342716610213596953623144295248493718711014576540359027993440374200731057853906219838744780847848968332144571386875194350643021845319104848100537061468067491927819119793995206141966342875444064374512371819217999839101591956181467514269123974894090718649423196156794520809514655022523160388193014209376213785595663893778708303906979207734672218256259966150142150306803844773454920260541466592520149744285073251866600213243408819071048633173464965145390579626856100550810665879699816357473638405257145910289706414011097120628043903975951567715770042033786993600723055876317635942187312514712053292819182618612586732157919841484882916447060957527069572209175671167229109816909152801735067127485832228718352093539657251210835791513698820914442100675103346711031412671113699086585163983150197016515116851714376576183515565088490998985998238734552833163550764791853589322618548963213293308985706420467525907091548141654985946163718027098199430992448895757128289059232332609729971208443357326548938239119325974636673058360414281388303203824903758985243744170291327656180937734440307074692112019130203303801976211011004492932151608424448596376698389522868478312355265821314495768572624334418930396864262434107732269780280731891544110104468232527162010526522721116603966655730925471105578537634668206531098965269186205647693125705863566201855810072936065987648611791045334885034611365768675324944166803962657978771855608455296541266540853061434443185867697514566140680070023787765913440171274947042056223053899456131407112700040785473326993908145466464588079727082668306343285878569830523580893306575740679545716377525420211495576158140025012622859413021647155097925923099079654737612551765675135751782966645477917450112996148903046399471329621073404375189573596145890193897131117904297828564750320319869151402870808599048010941214722131794764777262241425485454033215718530614228813758504306332175182979866223717215916077166925474873898665494945011465406284336639379003976926567214638530673609657120918076383271664162748888007869256029022847210403172118608204190004229661711963779213375751149595015660496318629472654736425230817703675159067350235072835405670403867435136222247715891504953098444893330963408780769325993978054193414473774418426312986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            }
            else
            {
                if (!(input == ""))
                {
                    Console.WriteLine("No command with the name of \"" + input + "\"");
                }
            }
        }

    }
}

[GoldenretriverYT]

unless you are getting errors everything is fine, there were some breaking changes but prob nothing that affected you. building the iso should be the same

[DarkOutcast6]

@GoldenretriverYT Got it. Where is the DevKit installation located? I couldn't find it on the COSMOS webpage.

[zarlo]

@GoldenretriverYT Got it. Where is the DevKit installation located? I couldn't find it on the COSMOS webpage.

same as userkit

"%appdata%/local/Cosmo User Kit" (i think) on windows /opt/cosmos on linux

[DarkOutcast6]

@zarlo But how do I install the devkit?

[zarlo]

@zarlo But how do I install the devkit?

oh https://cosmosos.github.io/install.html#dev-kit

• install git
• install Workload: Visual Studio Extension Development
• Inno Setup (Free) – Install with defaults
• clone the main repo https://github.com/cosmosos/cosmos.git
• run install-VS2022.bat

[DarkOutcast6]

@zarlo I believe I have done all of the steps, including cloning the main repo via the Git GUI. What do I do next?

[zarlo]

run install-VS2022.bat

[DarkOutcast6]

@zarlo Does that install Visual Studio? If so, I already have Visual Studio 2022 from when I installed the UserKit.

[zarlo]

@zarlo Does that install Visual Studio? If so, I already have Visual Studio 2022 from when I installed the UserKit.

no i does not i just has VS2022 in its name as there was a time when VS2019 and VS2022 where supported at the same time

[DarkOutcast6]

@zarlo I don’t understand… what does install-VS2022.bat do?

[zarlo]

it installs cosmos

[DarkOutcast6]

@zarlo Where is it located on my computer?

[zarlo]

@zarlo Where is it located on my computer?

its in the cosmos repo so where ever you cloned to repo

[DarkOutcast6]

@zarlo Found it. For some reason, when I run it (even if I run it as administrator) it opens, then it briefly blinks a paragraph in red text that may be an error, but it quickly closes the console, so I am unable to read it. I will try to freeze the screen to get a closer look.

[zarlo]

open powershell and run it from there

[DarkOutcast6]

@zarlo Just ran it in Powershell, and it gave me the error:

D:\amfut\Documents\COSMOS_OS\source\Cosmos.Build.Builder\Cosmos.Build.Builder.csproj : error : Could not resolve SDK "M
icrosoft.NET.Sdk". Exactly one of the probing messages below indicates why we could not resolve the SDK. Investigate an
d resolve that message to correctly specify the SDK.
D:\amfut\Documents\COSMOS_OS\source\Cosmos.Build.Builder\Cosmos.Build.Builder.csproj : error :   The NuGetSdkResolver d
id not resolve this SDK because there was no version specified in the project or global.json.
D:\amfut\Documents\COSMOS_OS\source\Cosmos.Build.Builder\Cosmos.Build.Builder.csproj : error :   MSB4276: The default S
DK resolver failed to resolve SDK "Microsoft.NET.Sdk" because directory "C:\Program Files\Microsoft Visual Studio\2022\
Community\MSBuild\Sdks\Microsoft.NET.Sdk\Sdk" did not exist.
D:\amfut\Documents\COSMOS_OS\source\Cosmos.Build.Builder\Cosmos.Build.Builder.csproj : error MSB4236: The SDK 'Microsof
t.NET.Sdk' specified could not be found.

looks like something to do with the .NET SDK, but I thought I installed it... maybe not?

[zarlo]

do you have net6.0 installed?

[DarkOutcast6]

I thought I did… when I installed it from .NET 6.0.25 from https://dotnet.microsoft.com/en-us/download/dotnet/6.0, I seem to remember it successfully installing. Should I try to install it again or am I doing something wrong?

[DarkOutcast6]

@zarlo Just tested, looks like I have .NET6 installed on my computer. I tried reinstalling it, but it did nothing. Is it possible that COSMOS may simply just not have the path to the .NET installation? If so, how could I fix that? If not, what do you think it is?

[zarlo]

i think you might need .net 4.8 too on windows

[DarkOutcast6]

@zarlo Just installed 4.8, didn’t do anything. What else might I need to do?

[DarkOutcast6]

@zarlo Just got rid of the error! Had to install the .NET development workload, and everything seems to be working well. Now, how do I switch my CosmosKernel to use DevKit instead of UserKit? Will it automatically do so, or do I have to uninstall UserKit or something?

[DarkOutcast6]

@zarlo Now, when I run my project, it gives me this error:

Build started at 8:03 AM...
1>------ Build started: Project: CosmosKernel1, Configuration: Debug Any CPU ------
1>CosmosKernel1 -> C:\Users\amfut\source\repos\CosmosKernel1\CosmosKernel1\bin\Debug\net6.0\CosmosKernel1.dll
1>Executing IL2CPU on assembly
1>Kernel Base: Cosmos.System.Kernel
1>Checking target assembly: C:\Users\amfut\source\repos\CosmosKernel1\CosmosKernel1\bin\Debug\net6.0\CosmosKernel1.dll
1>IL2CPU : error : Exception: System.Exception: Native code encountered, plug required. Check build output for more information.
1>  DO NOT REPORT THIS AS A BUG.
1>  Please see http://www.gocosmos.org/docs/plugs/missing/
1>  Need plug for: System.Void  System.String..ctor(System.ReadOnlySpan`1<System.Char>)(Plug Signature: System_Void__System_String__ctor_System_ReadOnlySpan_1_System_Char__ ).
1>  Static: False
1>  Assembly: System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
1>  Called from:
1>System.Runtime.CompilerServices.DefaultInterpolatedStringHandler::System.String ToStringAndClear()
1>Cosmos.System.Kernel::Void Start()
1>
1>
1>
1>   at Cosmos.IL2CPU.ILScanner.ScanMethod(MethodBase aMethod, Boolean aIsPlug, String sourceItem) in D:\amfut\Documents\IL2CPU\source\Cosmos.IL2CPU\ILScanner.cs:line 562
1>   at Cosmos.IL2CPU.ILScanner.ScanQueue() in D:\amfut\Documents\IL2CPU\source\Cosmos.IL2CPU\ILScanner.cs:line 751
1>   at Cosmos.IL2CPU.ILScanner.Execute(MethodBase aStartMethod, IEnumerable`1 plugsAssemblies) in D:\amfut\Documents\IL2CPU\source\Cosmos.IL2CPU\ILScanner.cs:line 270
1>   at Cosmos.IL2CPU.CompilerEngine.Execute() in D:\amfut\Documents\IL2CPU\source\Cosmos.IL2CPU\CompilerEngine.cs:line 186
1>IL2CPU task took 00:00:00.4061042
1>Done building project "CosmosKernel1.csproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 8:03 AM and took 00.740 seconds ==========

[quajak]

Seems to be a duplicate of https://github.com/CosmosOS/Cosmos/issues/2773. Please open new issues if you have new questions. If you need help using Cosmos please use the discussions or the discord rather than issues.

[DarkOutcast6]

After a bit more research, I was able to mess around with configuration and the .csproj and figure everything out (at least for now 😲 ). Thank you so much for the help @zarlo and @GoldenretriverYT!