Adding prefetchers causes rocket core to hang in firmware

[ColeStrickler]

Chipyard Version and Hash
Release: 1.13.0
Hash: 9975582d

OS Setup
5.15.0-131-generic ucb-bar/chipyard#141 SMP Fri Jan 10 21:18:28 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.4 LTS
Release: 22.04
Codename: jammy

Current Behavior
I have created a TargetConfig with the RocketPrefetching config as follows

`
class SingleRocketConfigWRME4Prefetch extends Config(
new freechips.rocketchip.subsystem.WithNBanks(1) ++
new freechips.rocketchip.subsystem.WithInclusiveCache(nWays=16, capacityKB=1024) ++
new freechips.rocketchip.subsystem.WithExtMemSize((1 << 30) * 4L) ++
new WithDefaultFireSimBridges ++
new WithFireSimConfigTweaks ++
new chipyard.PrefetchingRocketConfig)

I have also used this config but only using:
new barf.WithHellaCachePrefetcher(Seq(0), barf.SingleStridedPrefetcherParams()) ++
freechips.rocketchip.rocket.WithL1DCacheNonblocking(2) ++
new freechips.rocketchip.rocket.WithNHugeCores(1) ++
`

and both hang at the same point in OpenSBI. The output is as follows

`
Script started on 2025-02-27 11:46:45-06:00 [TERM="screen" TTY="/dev/pts/7" COLUMNS="80" LINES="24"]
+domain found: 0x0000
+bus found: 0x05
+device found: 0x00
+function found: 0x0
+bar found: 0x0
Using: 0000:05:00.0, BAR ID: 0, PCI Vendor ID: 0x10ee, PCI Device ID: 0x903f
Opening /sys/bus/pci/devices/0000:05:00.0/vendor
Opening /sys/bus/pci/devices/0000:05:00.0/device
examining xdma/.
examining xdma/..
examining xdma/xdma0_h2c_0
Using xdma write queue: /dev/xdma0_h2c_0
Using xdma read queue: /dev/xdma0_c2h_0
widget_registry_t::add_widget(StreamEngine)
cpu2fpga: 0, fpga2cpu: 2
UART0 is here (stdin/stdout).
TraceRV 0: Tracing disabled, since +tracefile was not provided.
command line for program 0. argc=26:
+permissive +macaddr0=00:12:6D:00:00:02 +blkdev0=rme0-rme.img +niclog0=niclog0 +blkdev-log0=blkdev-log0 +trace-select=1 +trace-start=0 +trace-end=-1 +trace-output-format=0 +dwarf-file-name=rme0-rme-bin-dwarf +autocounter-readrate=0 +autocounter-filename-base=AUTOCOUNTERFILE +print-start=0 +print-end=-1 +linklatency0=6405 +netbw0=200 +shmemportname0=default +domain=0x0000 +bus=0x05 +device=0x00 +function=0x0 +bar=0x0 +pci-vendor=0x10ee +pci-device=0x903f +permissive-off rme0-rme-bin
FireSim fingerprint: 0x46697265
TracerV: Trigger enabled from 0 to 18446744073709551615 cycles
Commencing simulation.
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick
tsibridge_t::tick skipping tick

OpenSBI v1.2

/ __ \ / | _ _ |
| | | | __ ___ _ __ | ( | |) || |
| | | | '_ \ / _ \ '_ \ ___ | _ < | |
| || | |) | _/ | | |) | |) || |
/| ./ || ||/|/|
| |
|_|

fdt_resv_memory_update_node() found address-cells : 2, size-cells: 2
fdt_resv_memory_update_node() found address-cells : 2, size-cells: 2
Platform Name : ucb-bar,chipyard
Platform Features : medeleg
Platform HART Count : 1
Platform IPI Device : aclint-mswi
Platform Timer Device : aclint-mtimer @ 1000000Hz
Platform Console Device : sifive_uart
Platform HSM Device : ---
Platform PMU Device : ---
Platform Reboot Device : htif
Platform Shutdown Device : htif
Platform Suspend Device : ---
Firmware Base : 0x80000000
Firmware Size : 360 KB
Firmware RW Offset : 0x40000
Runtime SBI Version : 1.0

Domain0 Name : root
Domain0 Boot HART : 0
Domain0 HARTs : 0*
Domain0 Region00 : 0x0000000002000000-0x000000000200ffff M: (I,R,W) S/U: ()
Domain0 Region01 : 0x0000000080040000-0x000000008005ffff M: (R,W) S/U: ()
Domain0 Region02 : 0x0000000080000000-0x000000008003ffff M: (R,X) S/U: ()
Domain0 Region03 : 0x0000000000000000-0xffffffffffffffff M: (R,W,X) S/U: (R,W,X)
Domain0 Next Address : 0x0000000080200000
Domain0 Next Arg1 : 0x0000000081600000
Domain0 Next Mode : S-mode
Domain0 SysReset : yes
Domain0 SysSuspend : yes

Boot HART ID : 0
Boot HART Domain : root
Boot HART Priv Version : v1.12
Boot HART Base ISA : rv64imafdcx
Boot HART ISA Extensions : none
Boot HART PMP Count : 8
Boot HART PMP Granularity : 4
Boot HART PMP Address Bits: 31
Boot HART MHPM Count : 0
Boot HART MIDELEG : 0x0000000000000222
Boot HART MEDELEG : 0x000000000000b109
`
At this point the hang occurs.