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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