# Kconfig SeaBIOS configuration
mainmenu "SeaBIOS Configuration"
menu "General Features"
choice
prompt "Build Target"
default QEMU
config COREBOOT
bool "Build for coreboot"
help
Configure as a coreboot payload.
config QEMU
bool "Build for QEMU/Xen/KVM/Bochs"
select QEMU_HARDWARE
help
Configure for an emulated machine (QEMU, Xen, KVM, or Bochs).
config CSM
bool "Build as Compatibility Support Module for EFI BIOS"
help
Configure to be used by EFI firmware as Compatibility Support
module (CSM) to provide legacy BIOS services.
endchoice
config QEMU_HARDWARE
bool "Support hardware found on emulators (QEMU/Xen/KVM/Bochs)" if !QEMU
default n
help
Support virtual hardware when the code detects it is
running on an emulator.
config XEN
depends on QEMU
bool "Support Xen HVM"
default y
help
Configure to be used by xen hvmloader, for a HVM guest.
config THREADS
bool "Parallelize hardware init"
default y
help
Support running hardware initialization in parallel.
config RELOCATE_INIT
bool "Copy init code to high memory"
default y
help
Support relocating the one time initialization code to high memory.
config BOOTMENU
depends on BOOT
bool "Bootmenu"
default y
help
Support an interactive boot menu at end of post.
config BOOTSPLASH
depends on BOOTMENU
bool "Graphical boot splash screen"
default y
help
Support showing a graphical boot splash screen.
config BOOTORDER
depends on BOOT
bool "Boot ordering"
default y
help
Support controlling of the boot order via the fw_cfg/CBFS
"bootorder" file.
config COREBOOT_FLASH
depends on COREBOOT
bool "coreboot CBFS support"
default y
help
Support searching coreboot flash format.
config LZMA
depends on COREBOOT_FLASH
bool "CBFS lzma support"
default y
help
Support CBFS files compressed using the lzma decompression
algorithm.
config CBFS_LOCATION
depends on COREBOOT_FLASH
hex "CBFS memory end location"
default 0
help
Memory address of where the CBFS data ends. This should
be zero for normal builds. It may be a non-zero value if
the CBFS filesystem is at a non-standard location (eg,
0xffe00000 if CBFS ends 2Meg below the end of flash).
config MULTIBOOT
depends on COREBOOT
bool "multiboot support"
default y
help
Add multiboot header in bios.bin.raw and accept files supplied
as multiboot modules.
config ENTRY_EXTRASTACK
bool "Use internal stack for 16bit interrupt entry points"
default y
help
Utilize an internal stack for all the legacy 16bit
interrupt entry points. This reduces the amount of space
on the caller's stack that SeaBIOS uses. This may
adversely impact any legacy operating systems that call
the BIOS in 16bit protected mode.
config MALLOC_UPPERMEMORY
bool "Allocate memory that needs to be in first Meg above 0xc0000"
default y
help
Use the "Upper Memory Block" area (0xc0000-0xf0000) for
internal "low memory" allocations. If this is not
selected, the memory is instead allocated from the
"9-segment" (0x90000-0xa0000).
config ROM_SIZE
int "ROM size (in KB)"
default 0
help
Set the ROM size. Say '0' here to make seabios figure the
needed size automatically.
Currently SeaBIOS will easily fit into 256 KB. To make it fit
it into 128 KB (which was big enouth for a long time) you'll
probably have to disable some featues such as xhci support.
endmenu
menu "Hardware support"
config ATA
depends on DRIVES
bool "ATA controllers"
default y
help
Support for IDE disk code.
config ATA_DMA
depends on ATA
bool "ATA DMA"
default n
help
Detect and try to use ATA bus mastering DMA controllers.
config ATA_PIO32
depends on ATA
bool "ATA 32bit PIO"
default n
help
Use 32bit PIO accesses on ATA (minor optimization on PCI transfers).
config AHCI
depends on DRIVES
bool "AHCI controllers"
default y
help
Support for AHCI disk code.
config SDCARD
depends on DRIVES
bool "SD controllers"
default y
help
Support for SD cards on PCI host controllers.
config VIRTIO_BLK
depends on DRIVES && QEMU_HARDWARE
bool "virtio-blk controllers"
default y
help
Support boot from virtio-blk storage.
config VIRTIO_SCSI
depends on DRIVES && QEMU_HARDWARE
bool "virtio-scsi controllers"
default y
help
Support boot from virtio-scsi storage.
config PVSCSI
depends on DRIVES && QEMU_HARDWARE
bool "PVSCSI controllers"
default y
help
Support boot from Paravirtualized SCSI storage. This kind of storage
is mainly supported by VMware ESX hypervisor. It is commonly used
to allow fast storage access by communicating directly with the
underlying hypervisor. Enabling this type of boot will allow
booting directly from images imported from an ESX platform,
without the need to use slower emulation of storage controllers
such as IDE.
config ESP_SCSI
depends on DRIVES && QEMU_HARDWARE
bool "AMD PCscsi controllers"
default y
help
Support boot from AMD PCscsi storage.
config LSI_SCSI
depends on DRIVES && QEMU_HARDWARE
bool "lsi53c895a scsi controllers"
default y
help
Support boot from qemu-emulated lsi53c895a scsi storage.
config MEGASAS
depends on DRIVES
bool "LSI MegaRAID SAS controllers"
default y
help
Support boot from LSI MegaRAID SAS scsi storage.
config FLOPPY
depends on DRIVES && HARDWARE_IRQ
bool "Floppy controller"
default y
help
Support floppy drive access.
config FLASH_FLOPPY
depends on DRIVES
bool "Floppy images from CBFS or fw_cfg"
default y
help
Support floppy images stored in coreboot flash or from
QEMU fw_cfg.
config PS2PORT
depends on KEYBOARD || MOUSE
bool "PS/2 port"
default y
help
Support PS2 ports (keyboard and mouse).
config USB
bool "USB"
default y
help
Support USB devices.
config USB_UHCI
depends on USB
bool "USB UHCI controllers"
default y
help
Support USB UHCI controllers.
config USB_OHCI
depends on USB
bool "USB OHCI controllers"
default y
help
Support USB OHCI controllers.
config USB_EHCI
depends on USB
bool "USB EHCI controllers"
default y
help
Support USB EHCI controllers.
config USB_XHCI
depends on USB
bool "USB XHCI controllers"
default y
help
Support USB XHCI controllers.
config USB_MSC
depends on USB && DRIVES
bool "USB drives"
default y
help
Support USB BOT (bulk-only transport) disks.
config USB_UAS
depends on USB && DRIVES
bool "UAS drives"
default y
help
Support USB UAS (usb attached scsi) disks.
config USB_HUB
depends on USB
bool "USB hubs"
default y
help
Support USB hubs.
config USB_KEYBOARD
depends on USB && KEYBOARD
bool "USB keyboards"
default y
help
Support USB keyboards.
config USB_MOUSE
depends on USB && MOUSE
bool "USB mice"
default y
help
Support USB mice.
config SERIAL
bool "Serial port"
default y
help
Support serial ports. This also enables int 14 serial port calls.
config LPT
bool "Parallel port"
default y
help
Support parallel ports. This also enables int 17 parallel port calls.
config RTC_TIMER
bool "Real Time Clock (RTC) scheduling"
depends on HARDWARE_IRQ
default y
help
Support MC146818 Real Time Clock chip timer
interrupts. This also enables int 1583 and int 1586 calls.
Disabling this support does not disable access to the RTC
cmos registers.
config HARDWARE_IRQ
bool "Hardware interrupts"
default y
help
Program and support hardware interrupts using the i8259
programmable interrupt controller (PIC). This option must
be enabled in order to support most boot loaders. Only
disable this option if running on peculiar hardware known
not to support irq routing.
config USE_SMM
depends on QEMU
bool "System Management Mode (SMM)"
default y
help
Support System Management Mode (on emulators).
config CALL32_SMM
bool
depends on USE_SMM
default y
config MTRR_INIT
depends on QEMU
bool "Initialize MTRRs"
default y
help
Initialize the Memory Type Range Registers (on emulators).
config PMTIMER
bool "Support ACPI timer"
default y
help
Detect and use the ACPI timer for timekeeping.
config TSC_TIMER
bool "Support CPU timestamp counter as timer"
default y
help
Support for using the CPU timestamp counter as an internal
timing source.
endmenu
menu "BIOS interfaces"
config DRIVES
bool "Drive interface"
default y
help
Support int13 disk/floppy drive functions.
config CDROM_BOOT
depends on DRIVES
bool "DVD/CDROM booting"
default y
help
Support for booting from a CD. (El Torito spec support.)
config CDROM_EMU
depends on CDROM_BOOT
bool "DVD/CDROM boot drive emulation"
default y
help
Support bootable CDROMs that emulate a floppy/harddrive.
config PCIBIOS
bool "PCIBIOS interface"
default y
help
Support int 1a/b1 PCI BIOS calls.
config APMBIOS
bool "APM interface"
default y
help
Support int 15/53 APM BIOS calls.
config PNPBIOS
bool "PnP BIOS interface"
default y
help
Support PnP BIOS entry point.
config OPTIONROMS
bool "Option ROMS"
default y
help
Support finding and running option roms during POST.
config OPTIONROMS_DEPLOYED
depends on OPTIONROMS && QEMU
bool "Option roms are already at 0xc0000-0xf0000"
default n
help
Select this if option ROMs are already copied to
0xc0000-0xf0000. This must only be selected when using
Bochs or QEMU versions older than 0.12.
config PMM
depends on OPTIONROMS
bool "PMM interface"
default y
help
Support Post Memory Manager (PMM) entry point.
config BOOT
bool "Boot interface"
default y
help
Support int 19/18 system bootup support.
config KEYBOARD
bool "Keyboard interface"
default y
help
Support int 16 keyboard calls.
config KBD_CALL_INT15_4F
depends on KEYBOARD
bool "Keyboard hook interface"
default y
help
Support calling int155f on each keyboard event.
config MOUSE
bool "Mouse interface"
default y
help
Support for int15c2 mouse calls.
config S3_RESUME
bool "S3 resume"
default y
help
Support S3 resume handler.
config VGAHOOKS
bool "Hardware specific VGA helpers"
default y
help
Support int 155f BIOS callbacks specific to some Intel and
VIA on-board vga devices.
config DISABLE_A20
bool "Disable A20"
default n
help
Disable A20 on 16bit boot.
config WRITABLE_UPPERMEMORY
depends on QEMU
bool "Make unused UMB memory read/writeable."
default n
help
When selected, the "Upper Memory Block" area
(0x90000-0xa0000) that is not used for option roms will be
made writable. This allows the ram to be directly
modified by programs. However, some old DOS high memory
managers may require the UMB region to be read-only.
config TCGBIOS
depends on S3_RESUME
bool "TPM support and TCG BIOS extensions"
default y
help
Provide TPM support along with TCG BIOS extensions
endmenu
menu "BIOS Tables"
depends on QEMU
config PIRTABLE
bool "PIR table"
default y
help
Support generation of a PIR table in 0xf000 segment.
config MPTABLE
bool "MPTable"
default y
help
Support generation of MPTable.
config SMBIOS
bool "SMBIOS"
default y
help
Support generation of SM BIOS tables. This is also
sometimes called DMI.
config ACPI
bool "ACPI"
default y
help
Support generation of ACPI tables.
config ACPI_DSDT
bool "Include default ACPI DSDT"
default y
depends on ACPI
help
Include default DSDT ACPI table in BIOS.
Required for QEMU 1.3 and older.
This option can be disabled for QEMU 1.4 and newer
to save some space in the ROM file.
If unsure, say Y.
config FW_ROMFILE_LOAD
bool "Load BIOS tables from ROM files"
depends on QEMU_HARDWARE
default y
help
Support loading BIOS firmware tables from ROM files.
At the moment, only ACPI tables can be loaded in this way.
Required for QEMU 1.7 and newer.
This option can be disabled for QEMU 1.6 and older
to save some space in the ROM file.
If unsure, say Y.
endmenu
source vgasrc/Kconfig
menu "Debugging"
config DEBUG_LEVEL
int "Debug level"
default 1
help
Control how verbose debug output is. The higher the
number, the more verbose SeaBIOS will be.
Set to zero to disable debugging.
config DEBUG_SERIAL
depends on DEBUG_LEVEL != 0
bool "Serial port debugging"
default n
help
Send debugging information to serial port.
config DEBUG_SERIAL_PORT
depends on DEBUG_SERIAL
hex "Serial port base address"
default 0x3f8
help
Base port for serial - generally 0x3f8, 0x2f8, 0x3e8, or 0x2e8.
config DEBUG_IO
depends on QEMU_HARDWARE && DEBUG_LEVEL != 0
bool "Special IO port debugging"
default y
help
Some emulators or hypervisors provide with a way to output debug
information by outputing strings in a special port present in the
IO space.
config DEBUG_COREBOOT
depends on COREBOOT && DEBUG_LEVEL != 0
bool "coreboot cbmem debug logging"
default y
help
Send debugging information to the coreboot cbmem console buffer.
Needs CONFIG_CONSOLE_CBMEM in coreboot. You can read the log
after boot using 'cbmem -c'. Only 32bit code (basically every-
thing before booting the OS) writes to the log buffer.
endmenu