## SPDX-License-Identifier: GPL-2.0-only menu "Devices" config HAVE_VGA_TEXT_FRAMEBUFFER bool depends on !NO_GFX_INIT help Selected by graphics drivers that support legacy VGA text mode. config HAVE_VBE_LINEAR_FRAMEBUFFER bool depends on !NO_GFX_INIT help Selected by graphics drivers that can set up a VBE linear-framebuffer mode. config HAVE_LINEAR_FRAMEBUFFER bool depends on !NO_GFX_INIT help Selected by graphics drivers that can set up a generic linear framebuffer. config HAVE_FSP_GOP bool help Selected by drivers that support to run a blob that implements the Graphics Output Protocol (GOP). config MAINBOARD_NO_FSP_GOP bool help Selected by mainboards that do not have any graphics ports connected to the SoC. config MAINBOARD_HAS_NATIVE_VGA_INIT def_bool n help Selected by mainboards / drivers that provide native graphics init within coreboot. config MAINBOARD_FORCE_NATIVE_VGA_INIT def_bool n depends on MAINBOARD_HAS_NATIVE_VGA_INIT || MAINBOARD_HAS_LIBGFXINIT help Selected by mainboards / chipsets whose graphics driver can't or shouldn't be disabled. config MAINBOARD_HAS_LIBGFXINIT def_bool n help Selected by mainboards that implement support for `libgfxinit`. Usually this requires a list of ports to be probed for displays. choice prompt "Graphics initialization" default NO_GFX_INIT if VGA_BIOS && PAYLOAD_SEABIOS default VGA_ROM_RUN if VGA_BIOS default MAINBOARD_DO_NATIVE_VGA_INIT default MAINBOARD_USE_LIBGFXINIT default RUN_FSP_GOP if INTEL_GMA_HAVE_VBT config MAINBOARD_DO_NATIVE_VGA_INIT bool "Use native graphics init" depends on MAINBOARD_HAS_NATIVE_VGA_INIT help Some mainboards, such as the Google Link, allow initializing the display without the need of a binary only VGA OPROM. Enabling this option may be faster, but also lacks flexibility in setting modes. config MAINBOARD_USE_LIBGFXINIT bool "Use libgfxinit" depends on MAINBOARD_HAS_LIBGFXINIT select HAVE_VGA_TEXT_FRAMEBUFFER select HAVE_LINEAR_FRAMEBUFFER select VGA if VGA_TEXT_FRAMEBUFFER help Use the SPARK library `libgfxinit` for the native graphics initialization. This requires an Ada toolchain. # TODO: Explain differences (if any) for onboard cards. config VGA_ROM_RUN bool "Run VGA Option ROMs" depends on PCI && (ARCH_X86 || ARCH_PPC64) && !MAINBOARD_FORCE_NATIVE_VGA_INIT select HAVE_VGA_TEXT_FRAMEBUFFER help Execute VGA Option ROMs in coreboot if found. This can be used to enable PCI/AGP/PCI-E video cards when not using a SeaBIOS payload. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly. config RUN_FSP_GOP bool "Run a GOP driver" depends on HAVE_FSP_GOP && !MAINBOARD_NO_FSP_GOP select HAVE_LINEAR_FRAMEBUFFER help Some platforms (e.g. Intel Braswell and Skylake/Kaby Lake) support to run a GOP blob. This option enables graphics initialization with such a blob. config NO_GFX_INIT bool "None" depends on !MAINBOARD_FORCE_NATIVE_VGA_INIT help Select this to not perform any graphics initialization in coreboot. This is useful if the payload (e.g. SeaBIOS) can initialize graphics or if pre-boot graphics are not required. endchoice config ONBOARD_VGA_IS_PRIMARY bool "Use onboard VGA as primary video device" default n depends on PCI help This option lets you select which VGA device will be used to decode legacy VGA cycles. Not all chipsets implement this however. If not selected, the last adapter found will be used, else the onboard adapter is used. config S3_VGA_ROM_RUN bool "Re-run VGA Option ROMs on S3 resume" default y depends on VGA_ROM_RUN && HAVE_ACPI_RESUME help Execute VGA Option ROMs in coreboot when resuming from S3 suspend. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly. If unsure, say N when using SeaBIOS as payload, Y otherwise. config ALWAYS_LOAD_OPROM def_bool n depends on VGA_ROM_RUN help Always load option ROMs if any are found. The decision to run the ROM is still determined at runtime, but the distinction between loading and not running comes into play for CHROMEOS. An example where this is required is that VBT (Video BIOS Tables) are needed for the kernel's display driver to know how a piece of hardware is configured to be used. config ALWAYS_RUN_OPROM def_bool n depends on VGA_ROM_RUN && ALWAYS_LOAD_OPROM help Always uncondtionally run the option regardless of other policies. config ON_DEVICE_ROM_LOAD bool "Load Option ROMs on PCI devices" default n if PAYLOAD_SEABIOS default y if !PAYLOAD_SEABIOS depends on VGA_ROM_RUN help Load Option ROMs stored on PCI/PCIe/AGP VGA devices in coreboot. If disabled, only Option ROMs stored in CBFS will be executed by coreboot. If you are concerned about security, you might want to disable this option, but it might leave your system in a state of degraded functionality. When using a SeaBIOS payload it runs all option ROMs with much more complete BIOS interrupt services available than coreboot, which some option ROMs require in order to function correctly. If unsure, say N when using SeaBIOS as payload, Y otherwise. choice prompt "Option ROM execution type" default PCI_OPTION_ROM_RUN_YABEL if !ARCH_X86 default PCI_OPTION_ROM_RUN_REALMODE if ARCH_X86 depends on VGA_ROM_RUN config PCI_OPTION_ROM_RUN_REALMODE prompt "Native mode" bool depends on ARCH_X86 help If you select this option, PCI Option ROMs will be executed natively on the CPU in real mode. No CPU emulation is involved, so this is the fastest, but also the least secure option. (only works on x86/x64 systems) config PCI_OPTION_ROM_RUN_YABEL prompt "Secure mode" bool help If you select this option, the x86emu CPU emulator will be used to execute PCI Option ROMs. This option prevents Option ROMs from doing dirty tricks with the system (such as installing SMM modules or hypervisors), but it is also significantly slower than the native Option ROM initialization method. This is the default choice for non-x86 systems. endchoice config YABEL_PCI_ACCESS_OTHER_DEVICES prompt "Allow Option ROMs to access other devices" bool depends on PCI_OPTION_ROM_RUN_YABEL help Per default, YABEL only allows Option ROMs to access the PCI device that they are associated with. However, this causes trouble for some onboard graphics chips whose Option ROM needs to reconfigure the north bridge. config YABEL_PCI_FAKE_WRITING_OTHER_DEVICES_CONFIG prompt "Fake success on writing other device's config space" bool depends on YABEL_PCI_ACCESS_OTHER_DEVICES help By default, YABEL aborts when the Option ROM tries to write to other devices' config spaces. With this option enabled, the write doesn't follow through, but the Option ROM is allowed to go on. This can create issues such as hanging Option ROMs (if it depends on that other register changing to the written value), so test for impact before using this option. config YABEL_VIRTMEM_LOCATION prompt "Location of YABEL's virtual memory" hex depends on PCI_OPTION_ROM_RUN_YABEL default 0x1000000 help YABEL requires 1MB memory for its CPU emulation. This memory is normally located at 16MB. config YABEL_DIRECTHW prompt "Direct hardware access" bool depends on PCI_OPTION_ROM_RUN_YABEL && ARCH_X86 help YABEL consists of two parts: It uses x86emu for the CPU emulation and additionally provides a PC system emulation that filters bad device and memory access (such as PCI config space access to other devices than the initialized one). When choosing this option, x86emu will pass through all hardware accesses to memory and I/O devices to the underlying memory and I/O addresses. While this option prevents Option ROMs from doing dirty tricks with the CPU (such as installing SMM modules or hypervisors), they can still access all devices in the system. Enable this option for a good compromise between security and speed. config MULTIPLE_VGA_ADAPTERS bool default n menu "Display" depends on HAVE_VGA_TEXT_FRAMEBUFFER || HAVE_LINEAR_FRAMEBUFFER config FRAMEBUFFER_SET_VESA_MODE prompt "Set framebuffer graphics resolution" bool default y if CHROMEOS depends on PCI_OPTION_ROM_RUN_YABEL || PCI_OPTION_ROM_RUN_REALMODE select HAVE_VBE_LINEAR_FRAMEBUFFER help Set VESA/native framebuffer mode (needed for bootsplash and graphical framebuffer console) if FRAMEBUFFER_SET_VESA_MODE choice prompt "framebuffer graphics resolution" default FRAMEBUFFER_VESA_MODE_118 help This option sets the resolution used for the coreboot framebuffer (and bootsplash screen). config FRAMEBUFFER_VESA_MODE_100 bool "640x400 256-color" config FRAMEBUFFER_VESA_MODE_101 bool "640x480 256-color" config FRAMEBUFFER_VESA_MODE_102 bool "800x600 16-color" config FRAMEBUFFER_VESA_MODE_103 bool "800x600 256-color" config FRAMEBUFFER_VESA_MODE_104 bool "1024x768 16-color" config FRAMEBUFFER_VESA_MODE_105 bool "1024x768 256-color" config FRAMEBUFFER_VESA_MODE_106 bool "1280x1024 16-color" config FRAMEBUFFER_VESA_MODE_107 bool "1280x1024 256-color" config FRAMEBUFFER_VESA_MODE_108 bool "80x60 text" config FRAMEBUFFER_VESA_MODE_109 bool "132x25 text" config FRAMEBUFFER_VESA_MODE_10A bool "132x43 text" config FRAMEBUFFER_VESA_MODE_10B bool "132x50 text" config FRAMEBUFFER_VESA_MODE_10C bool "132x60 text" config FRAMEBUFFER_VESA_MODE_10D bool "320x200 32k-color (1:5:5:5)" config FRAMEBUFFER_VESA_MODE_10E bool "320x200 64k-color (5:6:5)" config FRAMEBUFFER_VESA_MODE_10F bool "320x200 16.8M-color (8:8:8)" config FRAMEBUFFER_VESA_MODE_110 bool "640x480 32k-color (1:5:5:5)" config FRAMEBUFFER_VESA_MODE_111 bool "640x480 64k-color (5:6:5)" config FRAMEBUFFER_VESA_MODE_112 bool "640x480 16.8M-color (8:8:8)" config FRAMEBUFFER_VESA_MODE_113 bool "800x600 32k-color (1:5:5:5)" config FRAMEBUFFER_VESA_MODE_114 bool "800x600 64k-color (5:6:5)" config FRAMEBUFFER_VESA_MODE_115 bool "800x600 16.8M-color (8:8:8)" config FRAMEBUFFER_VESA_MODE_116 bool "1024x768 32k-color (1:5:5:5)" config FRAMEBUFFER_VESA_MODE_117 bool "1024x768 64k-color (5:6:5)" config FRAMEBUFFER_VESA_MODE_118 bool "1024x768 16.8M-color (8:8:8)" config FRAMEBUFFER_VESA_MODE_119 bool "1280x1024 32k-color (1:5:5:5)" config FRAMEBUFFER_VESA_MODE_11A bool "1280x1024 64k-color (5:6:5)" config FRAMEBUFFER_VESA_MODE_11B bool "1280x1024 16.8M-color (8:8:8)" config FRAMEBUFFER_VESA_MODE_USER bool "Manually select VESA mode" endchoice # Map the config names to an integer (KB). config FRAMEBUFFER_VESA_MODE prompt "VESA mode" if FRAMEBUFFER_VESA_MODE_USER hex default 0x100 if FRAMEBUFFER_VESA_MODE_100 default 0x101 if FRAMEBUFFER_VESA_MODE_101 default 0x102 if FRAMEBUFFER_VESA_MODE_102 default 0x103 if FRAMEBUFFER_VESA_MODE_103 default 0x104 if FRAMEBUFFER_VESA_MODE_104 default 0x105 if FRAMEBUFFER_VESA_MODE_105 default 0x106 if FRAMEBUFFER_VESA_MODE_106 default 0x107 if FRAMEBUFFER_VESA_MODE_107 default 0x108 if FRAMEBUFFER_VESA_MODE_108 default 0x109 if FRAMEBUFFER_VESA_MODE_109 default 0x10A if FRAMEBUFFER_VESA_MODE_10A default 0x10B if FRAMEBUFFER_VESA_MODE_10B default 0x10C if FRAMEBUFFER_VESA_MODE_10C default 0x10D if FRAMEBUFFER_VESA_MODE_10D default 0x10E if FRAMEBUFFER_VESA_MODE_10E default 0x10F if FRAMEBUFFER_VESA_MODE_10F default 0x110 if FRAMEBUFFER_VESA_MODE_110 default 0x111 if FRAMEBUFFER_VESA_MODE_111 default 0x112 if FRAMEBUFFER_VESA_MODE_112 default 0x113 if FRAMEBUFFER_VESA_MODE_113 default 0x114 if FRAMEBUFFER_VESA_MODE_114 default 0x115 if FRAMEBUFFER_VESA_MODE_115 default 0x116 if FRAMEBUFFER_VESA_MODE_116 default 0x117 if FRAMEBUFFER_VESA_MODE_117 default 0x118 if FRAMEBUFFER_VESA_MODE_118 default 0x119 if FRAMEBUFFER_VESA_MODE_119 default 0x11A if FRAMEBUFFER_VESA_MODE_11A default 0x11B if FRAMEBUFFER_VESA_MODE_11B default 0x118 if FRAMEBUFFER_VESA_MODE_USER endif # FRAMEBUFFER_SET_VESA_MODE config WANT_LINEAR_FRAMEBUFFER bool default y if CHROMEOS default y if PAYLOAD_TIANOCORE choice prompt "Framebuffer mode" default VBE_LINEAR_FRAMEBUFFER if HAVE_VBE_LINEAR_FRAMEBUFFER && WANT_LINEAR_FRAMEBUFFER default GENERIC_LINEAR_FRAMEBUFFER if HAVE_LINEAR_FRAMEBUFFER && WANT_LINEAR_FRAMEBUFFER default VGA_TEXT_FRAMEBUFFER config VGA_TEXT_FRAMEBUFFER bool "Legacy VGA text mode" depends on HAVE_VGA_TEXT_FRAMEBUFFER help If this option is enabled, coreboot will initialize graphics in legacy VGA text mode or, if a VGA BIOS is used and a VESA mode set, switch to text mode before handing control to a payload. config VBE_LINEAR_FRAMEBUFFER bool "VESA framebuffer" depends on HAVE_VBE_LINEAR_FRAMEBUFFER help This option keeps the framebuffer mode set after coreboot finishes execution. If this option is enabled, coreboot will pass a framebuffer entry in its coreboot table and the payload will need a compatible driver. config GENERIC_LINEAR_FRAMEBUFFER bool "Linear \"high-resolution\" framebuffer" depends on HAVE_LINEAR_FRAMEBUFFER help This option enables a high-resolution, linear framebuffer. If this option is enabled, coreboot will pass a framebuffer entry in its coreboot table and the payload will need a compatible driver. endchoice # Workaround to have LINEAR_FRAMEBUFFER set in both cases # VBE_LINEAR_FRAMEBUFFER and GENERIC_LINEAR_FRAMEBUFFER. # `kconfig_lint` doesn't let us use the same name with # different texts in the choice above. config LINEAR_FRAMEBUFFER def_bool y depends on VBE_LINEAR_FRAMEBUFFER || GENERIC_LINEAR_FRAMEBUFFER config BOOTSPLASH prompt "Show graphical bootsplash" bool depends on LINEAR_FRAMEBUFFER help This option shows a graphical bootsplash screen. The graphics are loaded from the CBFS file bootsplash.jpg. You can either specify the location and file name of the image in the 'General' section or add it manually to CBFS, using, for example, cbfstool. config LINEAR_FRAMEBUFFER_MAX_WIDTH int "Maximum width in pixels" depends on LINEAR_FRAMEBUFFER && MAINBOARD_USE_LIBGFXINIT default 2560 help Set the maximum width of the framebuffer. This may help with default fonts too tiny for high-resolution displays. config LINEAR_FRAMEBUFFER_MAX_HEIGHT int "Maximum height in pixels" depends on LINEAR_FRAMEBUFFER && MAINBOARD_USE_LIBGFXINIT default 1600 help Set the maximum height of the framebuffer. This may help with default fonts too tiny for high-resolution displays. endmenu # "Display" config PCI bool default n if PCI config NO_MMCONF_SUPPORT bool default n config MMCONF_SUPPORT bool default !NO_MMCONF_SUPPORT config HYPERTRANSPORT_PLUGIN_SUPPORT bool default n config HT_CHAIN_UNITID_BASE int default 0 config HT_CHAIN_END_UNITID_BASE int default 0 config PCIX_PLUGIN_SUPPORT bool default y config CARDBUS_PLUGIN_SUPPORT bool default y config AZALIA_PLUGIN_SUPPORT bool default n config PCIEXP_PLUGIN_SUPPORT bool default y endif # PCI if PCIEXP_PLUGIN_SUPPORT config PCIEXP_COMMON_CLOCK prompt "Enable PCIe Common Clock" bool default n help Detect and enable Common Clock on PCIe links. config PCIEXP_ASPM prompt "Enable PCIe ASPM" bool default n help Detect and enable ASPM (Active State Power Management) on PCIe links. config PCIEXP_CLK_PM prompt "Enable PCIe Clock Power Management" bool default n help Detect and enable Clock Power Management on PCIe. config PCIEXP_L1_SUB_STATE prompt "Enable PCIe ASPM L1 SubState" bool depends on (MMCONF_SUPPORT || PCI_IO_CFG_EXT) default n help Detect and enable ASPM on PCIe links. config PCIEXP_HOTPLUG prompt "Enable PCIe Hotplug Support" bool default n help Allocate resources for PCIe hotplug bridges if PCIEXP_HOTPLUG config PCIEXP_HOTPLUG_BUSES int "PCI Express Hotplug Buses" default 32 help This is the number of buses allocated for hotplug PCI express bridges, for use by hotplugged child devices. The default is 32 buses. config PCIEXP_HOTPLUG_MEM hex "PCI Express Hotplug Memory" default 0x800000 help This is the amount of memory space, in bytes, to allocate to hotplug PCI express bridges, for use by hotplugged child devices. This size should be page-aligned. The default is 8 MiB. config PCIEXP_HOTPLUG_PREFETCH_MEM hex "PCI Express Hotplug Prefetch Memory" default 0x10000000 help This is the amount of pre-fetchable memory space, in bytes, to allocate to hot-plug PCI express bridges, for use by hotplugged child devices. This size should be page-aligned. The default is 256 MiB. config PCIEXP_HOTPLUG_PREFETCH_MEM_ABOVE_4G bool depends on RESOURCE_ALLOCATOR_V4 default y if !PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G default n help This enables prefetch memory allocation above 4G boundary for the hotplug resources. config PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G bool "PCI Express Hotplug Prefetch Memory Allocation below 4G boundary" default n help This enables prefetch memory allocation below 4G boundary for the hotplug resources. config PCIEXP_HOTPLUG_IO hex "PCI Express Hotplug I/O Space" default 0x2000 help This is the amount of I/O space to allocate to hot-plug PCI express bridges, for use by hotplugged child devices. The default is 8 KiB. endif # PCIEXP_HOTPLUG endif # PCIEXP_PLUGIN_SUPPORT config EARLY_PCI_BRIDGE bool "Early PCI bridge" depends on PCI default n help While coreboot is executing code from ROM, the coreboot resource allocator has not been running yet. Hence PCI devices living behind a bridge are not yet visible to the system. This option enables static configuration for a single pre-defined PCI bridge function on bus 0. if EARLY_PCI_BRIDGE config EARLY_PCI_BRIDGE_DEVICE hex "bridge device" default 0x0 config EARLY_PCI_BRIDGE_FUNCTION hex "bridge function" default 0x0 config EARLY_PCI_MMIO_BASE hex "MMIO window base" default 0x0 endif # EARLY_PCI_BRIDGE config SUBSYSTEM_VENDOR_ID hex "Override PCI Subsystem Vendor ID" depends on PCI default 0x0000 help This config option will override the devicetree settings for PCI Subsystem Vendor ID. config SUBSYSTEM_DEVICE_ID hex "Override PCI Subsystem Device ID" depends on PCI default 0x0000 help This config option will override the devicetree settings for PCI Subsystem Device ID. config VGA_BIOS bool "Add a VGA BIOS image" depends on ARCH_X86 help Select this option if you have a VGA BIOS image that you would like to add to your ROM. You will be able to specify the location and file name of the image later. config VGA_BIOS_FILE string "VGA BIOS path and filename" depends on VGA_BIOS default "vgabios.bin" help The path and filename of the file to use as VGA BIOS. config VGA_BIOS_ID string "VGA device PCI IDs" depends on VGA_BIOS default "1106,3230" help The comma-separated PCI vendor and device ID with optional revision if that feature is enabled that would associate your vBIOS to your video card. Example: 1106,3230 or 1106,3230,a3 In the above example 1106 is the PCI vendor ID (in hex, but without the "0x" prefix) and 3230 specifies the PCI device ID of the video card (also in hex, without "0x" prefix). a3 specifies the revision. Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices. config VGA_BIOS_SECOND bool "Add a 2nd video BIOS image" depends on ARCH_X86 && VGA_BIOS help Select this option if you have a 2nd video BIOS image that you would like to add to your ROM. config VGA_BIOS_SECOND_FILE string "2nd video BIOS path and filename" depends on VGA_BIOS_SECOND default "vbios2.bin" help The path and filename of the file to use as video BIOS. config VGA_BIOS_SECOND_ID string "Graphics device PCI IDs" depends on VGA_BIOS_SECOND help The comma-separated PCI vendor and device ID with optional revision if that feature is enabled that would associate your vBIOS to your video card. Example: 1106,3230 or 1106,3230,a3 In the above example 1106 is the PCI vendor ID (in hex, but without the "0x" prefix) and 3230 specifies the PCI device ID of the video card (also in hex, without "0x" prefix). a3 specifies the revision. Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices. config CHECK_REV_IN_OPROM_NAME def_bool n help Select this in the platform BIOS or chipset if the option rom has a revision that needs to be checked when searching CBFS. config VGA_BIOS_DGPU bool "Add a discrete VGA BIOS image" depends on VGA_BIOS help Select this option if you have a VGA BIOS image for discrete GPU that you would like to add to your ROM. You will be able to specify the location and file name of the image later. config VGA_BIOS_DGPU_FILE string "Discrete VGA BIOS path and filename" depends on VGA_BIOS_DGPU default "vgabios_dgpu.bin" help The path and filename of the file to use as VGA BIOS for discrete GPU. config VGA_BIOS_DGPU_ID string "Discrete VGA device PCI IDs" depends on VGA_BIOS_DGPU default "1002,6663" help The comma-separated PCI vendor and device ID that would associate your VGA BIOS to your discrete video card. Examples: 1002,6663 for HD 8570M 1002,6665 for R5 M230 In the above examples 1002 is the PCI vendor ID (in hex, but without the "0x" prefix) and 6663 / 6665 specifies the PCI device ID of the discrete video card (also in hex, without "0x" prefix). Under GNU/Linux you can run `lspci -nn` to list the IDs of your PCI devices. config INTEL_GMA_HAVE_VBT bool help Select this in the mainboard Kconfig to indicate the board has a data.vbt file. config INTEL_GMA_ADD_VBT depends on SOC_INTEL_COMMON || CPU_INTEL_COMMON bool "Add a Video BIOS Table (VBT) binary to CBFS" default y if INTEL_GMA_HAVE_VBT help Add a VBT data file to CBFS. The VBT describes the integrated GPU and connections, and is needed by the GOP driver integrated into FSP and the OS driver in order to initialize the display. config INTEL_GMA_VBT_FILE string "VBT binary path and filename" depends on INTEL_GMA_ADD_VBT default "src/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/data.vbt" \ if INTEL_GMA_HAVE_VBT && VARIANT_DIR != "" default "src/mainboard/$(MAINBOARDDIR)/data.vbt" if INTEL_GMA_HAVE_VBT default "3rdparty/blobs/mainboard/$(MAINBOARDDIR)/vbt.bin" help The path and filename of the VBT binary. config SOFTWARE_I2C bool "Enable I2C controller emulation in software" default n help This config option will enable code to override the i2c_transfer routine with a (simple) software emulation of the protocol. This may be useful for debugging or on platforms where a driver for the real I2C controller is not (yet) available. The platform code needs to provide bindings to manually toggle I2C lines. config RESOURCE_ALLOCATOR_V3 bool default n help This config option enables resource allocator v3 which performs top down allocation of resources in a single MMIO window. This is the old resource allocator meant to be used only until the broken AMD chipsets are fixed. DO NOT USE THIS FOR ANY NEW CHIPSETS! config RESOURCE_ALLOCATOR_V4 bool default n if RESOURCE_ALLOCATOR_V3 default y if !RESOURCE_ALLOCATOR_V3 help This config option enables resource allocator v4 which uses multiple ranges for allocating resources. This allows allocation of resources above 4G boundary as well. config XHCI_UTILS def_bool n help Provides xHCI utility functions. endmenu