FreeBSD/Linux Kernel Cross Reference
sys/riscv/conf/NOTES

     #
     # NOTES -- Lines that can be cut/pasted into kernel and hints configs.
     #
     # This file contains machine dependent kernel configuration notes.  For
     # machine independent notes, look in /sys/conf/NOTES.
     #
     # $FreeBSD$
     #
     
    cpu             RISCV
    
    makeoptions     DEBUG=-g                # Build kernel with gdb(1) debug symbols
    makeoptions     WITH_CTF=1              # Run ctfconvert(1) for DTrace support
    
    options         PRINTF_BUFR_SIZE=128    # Prevent printf output being interspersed.
    options         KDTRACE_FRAME           # Ensure frames are compiled in
    options         KDTRACE_HOOKS           # Kernel DTrace hooks
    options         DDB_CTF                 # Kernel ELF linker loads CTF data
    options         FPE                     # Floating-point extension support
    options         RACCT_DEFAULT_TO_DISABLED # Set kern.racct.enable=0 by default
    
    # RISC-V SBI console
    device          rcons
    
    # pseudo devices
    device          clk
    device          hwreset
    device          phy
    device          regulator
    device          syscon
    device          syscon_power
    device          riscv_syscon
    
    # Backlight subsystem
    device          backlight
    
    # VirtIO support
    device          virtio                  # Generic VirtIO bus (required)
    device          virtio_pci              # VirtIO PCI device
    device          vtnet                   # VirtIO Ethernet device
    device          virtio_blk              # VirtIO Block device
    device          virtio_mmio             # VirtIO MMIO bus
    device          virtio_random           # VirtIO Entropy device
    
    # NVM Express (NVMe) support
    device          nvme            # base NVMe driver
    options         NVME_USE_NVD=0  # prefer the cam(4) based nda(4) driver
    device          nvd             # expose NVMe namespaces as disks, depends on nvme
    
    # NOTE: dtrace introduces CDDL-licensed components into the kernel
    device          dtrace                  # dtrace core
    device          dtraceall               # include all dtrace modules
    
    # Serial (COM) ports
    device          uart_lowrisc    # lowRISC UART driver
    device          uart_ns8250     # ns8250-type UART driver
    
    # RTC
    device          da9063_rtc      # Dialog Semiconductor DA9063 RTC
    device          goldfish_rtc    # QEMU RTC
    
    # Ethernet drivers
    device          xae             # Xilinx AXI Ethernet MAC
    
    # DMA support
    device          xdma            # DMA interface
    device          axidma          # Xilinx AXI DMA Controller
    
    # SPI
    device          xilinx_spi      # Xilinx AXI Quad-SPI Controller
    
    # Power management controllers
    device          da9063_pmic     # Dialog Semiconductor DA9063 PMIC
    
    # SiFive device drivers
    device          fe310aon
    device          fu740_pci_dw
    device          sifive_gpio
    device          sifive_spi
    files           "../sifive/files.sifive"
    
    # Flattened Device Tree
    options         FDT
    makeoptions     MODULES_EXTRA+="dtb/sifive"
    
    # FreeBSD/riscv didn't exist for these releases
    nooptions       COMPAT_FREEBSD4
    nooptions       COMPAT_FREEBSD5
    nooptions       COMPAT_FREEBSD6
    nooptions       COMPAT_FREEBSD7
    nooptions       COMPAT_FREEBSD9
    nooptions       COMPAT_FREEBSD10
    nooptions       COMPAT_FREEBSD11
    
    # riscv doesn't support inb/outb, so disable chipset probing which needs it
    nooptions       PPC_PROBE_CHIPSET
    
    # Makes assumptions about bus tags that aren't true on riscv
    nodevice        snd_cmi
   
   # Don't yet have hwpmc(4)
   nodevice        hwpmc
   nooptions       HWPMC_HOOKS
   
   # riscv doesn't yet have atomic_testandset_int and atomic_testandclear_int.
   nodevice        ccr
   nodevice        cxgbe
   nodevice        cxgbev

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