You might try older versions of gem5 too. I routinely use x86_64 Linux version 2.6.28.4 although (as Andrea mentions) the x86_64-gem5 support lags quite a bit behind ARM.
The fact you have NO output in terminal is suspicious. You should consider using m5term instead of telnet. If you aren't invested in gem5 yet, and you need x86_64, you may like to try MARSSx86 instead. It works better out-of-the-box. -Gedare On Fri, Dec 19, 2014 at 7:54 PM, Cagdas Dirik (cdirik) via gem5-users <[email protected]> wrote: > Hi, > > > > I am trying to build my own kernel, boot my own disk image, and run X86 in > FS mode . However I am running into issues with fresh built kernel because > gem5 hangs at the very beginning, nothing happens. > > I can boot my debian image on qemu. I can also boot this image using > out-of-box 2.6.22.9 kernel (although udev fails since it requires version > 2.6.26) > > But I cannot boot this image using fresh built kernel. I tried both dev > branch and stable branch. I also tried 2.6.26, 2.6.31 versions. All hang in > the same way. I don’t suspect anything different on kernel config > (especially with CPU type). > > > > I will follow guidelines in debugging page, and do some trace based > debugging. But in the meantime, if someone can give me a hint I will greatly > appreciate it. Are there any tool dependencies on building kernels for gem5? > Are there any other small details others experienced that I am missing? Do > others run into issues building their own kernel for gem5? > > > > One interesting thing is that when I compare my kernel vs. out-of-box > kernel, entry point addresses looks suspiciously different (0x200 vs. > 0x200000 on out-of-box kernel). That may result in jumping to an unexpected > address and result in system hang. Does anyone have any ideas why these > addresses differ significantly? Or would that be an issue? > > > > Below are details and my command lines for reference. > > > > Thanks in advance! > > > > Cagdas > > > > I downloaded kernel 2.6.28.4 (since x86 full system downloads come with > 2.6.28.4 config). My steps building the kernel (nothing out of ordinary): > > > > $ wget https://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.28.4.tar.bz2 > > $ tar xjvf linux-2.6.28.4.tar.bz2 > > $ cp $M5_PATH/configs/linux-2.6.28.4 linux-2.6.28.4/.config > > $ cd linux-2.6.28.4 > > $ make oldconfig > > $ make -j 32 > > $ make vmlinux -j 32 > > > > My gcc is 4.1.2 > > > > $ gcc --version > > gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-54) > > Copyright (C) 2006 Free Software Foundation, Inc. > > This is free software; see the source for copying conditions. There is NO > > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. > > > > If I boot this image using out-of-box kernel, gem5 boots fine (although udev > fails with version being older than 2.6.26): > > > > $ build/X86/gem5.opt configs/example/fs.py --disk-image=debian-amd64.img > --kernel=x86_64-vmlinux-2.6.22.9.smp --cpu-type=atomic --mem-type=simple_mem > > > > If I instead use custom built 2.6.28.4 kernel, gem5 hangs at the very > beginning. Nothing happens in the system. > > > > $ build/X86/gem5.opt configs/example/fs.py --disk-image=debian-amd64.img > --kernel=vmlinux-2.6.28.4 --cpu-type=atomic --mem-type=simple_mem > > gem5 Simulator System. http://gem5.org > > gem5 is copyrighted software; use the --copyright option for details. > > > > gem5 compiled Dec 19 2014 13:56:08 > > gem5 started Dec 19 2014 14:50:06 > > gem5 executing on rndarch17 > > command line: build/X86/gem5.opt configs/example/fs.py > --disk-image=debian-amd64.img --kernel=vmlinux-2.6.28.4 --cpu-type=atomic > --mem-type=simple_mem > > Global frequency set at 1000000000000 ticks per second > > info: kernel located at: > /proj/adg/REV/sim/cdirik/gem5-sims/ya-dist/m5/system/binaries/vmlinux-2.6.28.4 > > Listening for com_1 connection on port 3456 > > 0: rtc: Real-time clock set to Sun Jan 1 00:00:00 2012 > > 0: system.remote_gdb.listener: listening for remote gdb #0 on port 7000 > > warn: Reading current count from inactive timer. > > **** REAL SIMULATION **** > > info: Entering event queue @ 0. Starting simulation... > > 5951693500: system.pc.com_1.terminal: attach terminal 0 > > > > $ telnet 127.0.0.1 3456 > > Trying 127.0.0.1... > > Connected to localhost.localdomain (127.0.0.1). > > Escape character is '^]'. > > ==== m5 slave terminal: Terminal 0 ==== > > > > Here are the readelf outputs for two kernels for comparison: > > > > $ readelf -h $M5_PATH/binaries/x86_64-vmlinux-2.6.22.9.smp > > ELF Header: > > Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 > > Class: ELF64 > > Data: 2's complement, little endian > > Version: 1 (current) > > OS/ABI: UNIX - System V > > ABI Version: 0 > > Type: EXEC (Executable file) > > Machine: Advanced Micro Devices X86-64 > > Version: 0x1 > > Entry point address: 0x200000 > > Start of program headers: 64 (bytes into file) > > Start of section headers: 54040168 (bytes into file) > > Flags: 0x0 > > Size of this header: 64 (bytes) > > Size of program headers: 56 (bytes) > > Number of program headers: 5 > > Size of section headers: 64 (bytes) > > Number of section headers: 49 > > Section header string table index: 46 > > > > $ readelf -h $M5_PATH/binaries/vmlinux-2.6.28.4 > > ELF Header: > > Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 > > Class: ELF64 > > Data: 2's complement, little endian > > Version: 1 (current) > > OS/ABI: UNIX - System V > > ABI Version: 0 > > Type: EXEC (Executable file) > > Machine: Advanced Micro Devices X86-64 > > Version: 0x1 > > Entry point address: 0x200 > > Start of program headers: 64 (bytes into file) > > Start of section headers: 5037024 (bytes into file) > > Flags: 0x0 > > Size of this header: 64 (bytes) > > Size of program headers: 56 (bytes) > > Number of program headers: 2 > > Size of section headers: 64 (bytes) > > Number of section headers: 12 > > Section header string table index: 9 > > > > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users _______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
