Hi,
I am trying to limit the memory used by Linux so that I am left with
some physically addressable memory to use with accelerators in FS mode.
In physical systems, to do this, it suffices to boot the kernel with the
argument "mem=MAX_MEM", where MAX_MEM represents the maximum memory that
Linux can access and also the corresponding upper address.
However, when I add that kernel argument, the system just does not boot
(I get no output in the m5 terminal). If I remove that argument,
everything works fine. I am using the gem5 standard library and my code
is as follows:
========================================================================
requires(
isa_required=ISA.X86,
coherence_protocol_required=CoherenceProtocol.MESI_TWO_LEVEL,
)
memory = SingleChannelDDR3_1600(size="3GB")
processor = SimpleProcessor(cpu_type=CPUTypes.TIMING, num_cores=1)
cache_hierarchy = MESITwoLevelCacheHierarchy(
l1d_size="32kB",
l1d_assoc=8,
l1i_size="32kB",
l1i_assoc=8,
l2_size="1MB",
l2_assoc=16,
num_l2_banks=1,
)
board = X86Board(
clk_freq="3GHz",
processor=processor,
memory=memory,
cache_hierarchy=cache_hierarchy,
)
board.set_kernel_disk_workload(
kernel=CustomResource("fs_x86/binaries/vmlinux"),
kernel_args=["mem=2G"],
disk_image=CustomDiskImageResource("fs_x86/disks/gem5_base.img"),
)
simulator = Simulator(board=board)
simulator.run()
========================================================================
Does anyone have a clue of what the problem is or is there any other
logs that I can look at to understand where the boot process halts?
Thanks in advance!
Kind regards,
Joao Vieira
--
Joao Vieira
ECE PhD Student at Tecnico Lisboa | INESC-ID, Portugal
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