Ah, also, if modifying MAX_HARTS doesn't work then you can follow the following PRs to use a newer bootloader, which works with 16 cores. - Building the bootloader https://github.com/gem5/gem5-resources/pull/13 - Changing gem5 to use the new bootloader https://github.com/gem5/gem5/pull/390#issuecomment-1750191706.
Regards, Hoa Nguyen On Fri, Nov 17, 2023 at 11:22 PM Hoa Nguyen <hoangu...@ucdavis.edu> wrote: > Hi Nitish, > > The number of CPUs might also be limited by the bootloader as well. You > might want to recompile the bootloader using the following documentation > https://github.com/gem5/gem5-resources/tree/stable/src/riscv-fs#bootloader-bbl > . > > You might want to modify this parameter in the proxy kernel source code, > https://github.com/riscv-software-src/riscv-pk/blob/710c23a5bbeecf171ac86d6e39d275af8f176354/machine/mtrap.h#L9, > which limits the number of hardware threads. > Note that MAX_HARTS must follow this constraint, > https://github.com/riscv-software-src/riscv-pk/blob/710c23a5bbeecf171ac86d6e39d275af8f176354/machine/mtrap.c#L104 > . > > Regards, > Hoa Nguyen > > On Fri, Nov 17, 2023, 04:24 Nitish Arya via gem5-users < > gem5-users@gem5.org> wrote: > >> >> Hello, >> >> I am trying to run a 16 core RISCV full system simulation with the >> following command: >> >> /build/RISCV/gem5.opt configs/example/riscv/fs_linux.py --kernel >> riscv-bootloader-vmlinux-5.10 --disk-image riscv_disk.img --caches >> --mem-size=256MB --mem-type=DDR4_2400_8x8 --cpu-type=AtomicSimpleCPU -n 16 >> >> The kernel and the bootloader are from the gem5-resources for Ubuntu >> riscv. >> >> However the simulation hangs after the line Starting simulation... >> >> In another setup, I chose to build the kernel with NR_CPUS=64 and use >> that. It successfully boots and finishes the script but with the below >> error - >> >> In the system.platform.terminal I can see the kernel fails to bring up >> more than 8 CPUs: >> >> [ 0.001142] smp: Bringing up secondary CPUs ... >> [ 1.024519] CPU8: failed to come online >> [ 2.049026] CPU9: failed to come online >> [ 3.073533] CPU10: failed to come online >> [ 4.098040] CPU11: failed to come online >> [ 5.122547] CPU12: failed to come online >> [ 6.147054] CPU13: failed to come online >> [ 7.171561] CPU14: failed to come online >> [ 8.196068] CPU15: failed to come online >> [ 8.196086] smp: Brought up 1 node, 8 CPUs >> >> >> I believe the issue is with the PLIC implementation of RISCV. >> >> Please let me know your thoughts on this. >> >> Thanks >> >> Nitish >> >> _______________________________________________ >> gem5-users mailing list -- gem5-users@gem5.org >> To unsubscribe send an email to gem5-users-le...@gem5.org >> >
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