1 menu "x86 architecture"
8 prompt "Run U-Boot in 32/64-bit mode"
11 U-Boot can be built as a 32-bit binary which runs in 32-bit mode
12 even on 64-bit machines. In this case SPL is not used, and U-Boot
13 runs directly from the reset vector (via 16-bit start-up).
15 Alternatively it can be run as a 64-bit binary, thus requiring a
16 64-bit machine. In this case SPL runs in 32-bit mode (via 16-bit
17 start-up) then jumps to U-Boot in 64-bit mode.
19 For now, 32-bit mode is recommended, as 64-bit is still
20 experimental and is missing a lot of features.
25 Build U-Boot as a 32-bit binary with no SPL. This is the currently
26 supported normal setup. U-Boot will stay in 32-bit mode even on
27 64-bit machines. When booting a 64-bit kernel, U-Boot will switch
28 to 64-bit just before starting the kernel. Only the bottom 4GB of
29 memory can be accessed through normal means, although
30 arch_phys_memset() can be used for basic access to other memory.
37 select SPL_SEPARATE_BSS
39 Build U-Boot as a 64-bit binary with a 32-bit SPL. This is
40 experimental and many features are missing. U-Boot SPL starts up,
41 runs through the 16-bit and 32-bit init, then switches to 64-bit
42 mode and jumps to U-Boot proper.
54 prompt "Mainboard vendor"
55 default VENDOR_EMULATION
57 config VENDOR_ADVANTECH
60 config VENDOR_CONGATEC
63 config VENDOR_COREBOOT
72 config VENDOR_EMULATION
83 # subarchitectures-specific options below
85 bool "Intel MID platform support"
89 Select to build a U-Boot capable of supporting Intel MID
90 (Mobile Internet Device) platform systems which do not have
91 the PCI legacy interfaces.
93 If you are building for a PC class system say N here.
95 Intel MID platforms are based on an Intel processor and
96 chipset which consume less power than most of the x86
99 # board-specific options below
100 source "board/advantech/Kconfig"
101 source "board/congatec/Kconfig"
102 source "board/coreboot/Kconfig"
103 source "board/dfi/Kconfig"
104 source "board/efi/Kconfig"
105 source "board/emulation/Kconfig"
106 source "board/google/Kconfig"
107 source "board/intel/Kconfig"
109 # platform-specific options below
110 source "arch/x86/cpu/baytrail/Kconfig"
111 source "arch/x86/cpu/braswell/Kconfig"
112 source "arch/x86/cpu/broadwell/Kconfig"
113 source "arch/x86/cpu/coreboot/Kconfig"
114 source "arch/x86/cpu/ivybridge/Kconfig"
115 source "arch/x86/cpu/qemu/Kconfig"
116 source "arch/x86/cpu/quark/Kconfig"
117 source "arch/x86/cpu/queensbay/Kconfig"
118 source "arch/x86/cpu/tangier/Kconfig"
120 # architecture-specific options below
125 config SYS_MALLOC_F_LEN
134 depends on X86_RESET_VECTOR
143 default 0xfed00000 if !HPET_ADDRESS_OVERRIDE
152 config X86_RESET_VECTOR
156 # The following options control where the 16-bit and 32-bit init lies
157 # If SPL is enabled then it normally holds this init code, and U-Boot proper
158 # is normally a 64-bit build.
160 # The 16-bit init refers to the reset vector and the small amount of code to
161 # get the processor into 32-bit mode. It may be in SPL or in U-Boot proper,
162 # or missing altogether if U-Boot is started from EFI or coreboot.
164 # The 32-bit init refers to processor init, running binary blobs including
165 # FSP, setting up interrupts and anything else that needs to be done in
166 # 32-bit code. It is normally in the same place as 16-bit init if that is
167 # enabled (i.e. they are both in SPL, or both in U-Boot proper).
168 config X86_16BIT_INIT
170 depends on X86_RESET_VECTOR
171 default y if X86_RESET_VECTOR && !SPL
173 This is enabled when 16-bit init is in U-Boot proper
175 config SPL_X86_16BIT_INIT
177 depends on X86_RESET_VECTOR
178 default y if X86_RESET_VECTOR && SPL
180 This is enabled when 16-bit init is in SPL
182 config X86_32BIT_INIT
184 depends on X86_RESET_VECTOR
185 default y if X86_RESET_VECTOR && !SPL
187 This is enabled when 32-bit init is in U-Boot proper
189 config SPL_X86_32BIT_INIT
191 depends on X86_RESET_VECTOR
192 default y if X86_RESET_VECTOR && SPL
194 This is enabled when 32-bit init is in SPL
196 config RESET_SEG_START
198 depends on X86_RESET_VECTOR
201 config RESET_SEG_SIZE
203 depends on X86_RESET_VECTOR
208 depends on X86_RESET_VECTOR
211 config SYS_X86_START16
213 depends on X86_RESET_VECTOR
216 config X86_LOAD_FROM_32_BIT
217 bool "Boot from a 32-bit program"
219 Define this to boot U-Boot from a 32-bit program which sets
220 the GDT differently. This can be used to boot directly from
221 any stage of coreboot, for example, bypassing the normal
222 payload-loading feature.
224 config BOARD_ROMSIZE_KB_512
226 config BOARD_ROMSIZE_KB_1024
228 config BOARD_ROMSIZE_KB_2048
230 config BOARD_ROMSIZE_KB_4096
232 config BOARD_ROMSIZE_KB_8192
234 config BOARD_ROMSIZE_KB_16384
238 prompt "ROM chip size"
239 depends on X86_RESET_VECTOR
240 default UBOOT_ROMSIZE_KB_512 if BOARD_ROMSIZE_KB_512
241 default UBOOT_ROMSIZE_KB_1024 if BOARD_ROMSIZE_KB_1024
242 default UBOOT_ROMSIZE_KB_2048 if BOARD_ROMSIZE_KB_2048
243 default UBOOT_ROMSIZE_KB_4096 if BOARD_ROMSIZE_KB_4096
244 default UBOOT_ROMSIZE_KB_8192 if BOARD_ROMSIZE_KB_8192
245 default UBOOT_ROMSIZE_KB_16384 if BOARD_ROMSIZE_KB_16384
247 Select the size of the ROM chip you intend to flash U-Boot on.
249 The build system will take care of creating a u-boot.rom file
250 of the matching size.
252 config UBOOT_ROMSIZE_KB_512
255 Choose this option if you have a 512 KB ROM chip.
257 config UBOOT_ROMSIZE_KB_1024
258 bool "1024 KB (1 MB)"
260 Choose this option if you have a 1024 KB (1 MB) ROM chip.
262 config UBOOT_ROMSIZE_KB_2048
263 bool "2048 KB (2 MB)"
265 Choose this option if you have a 2048 KB (2 MB) ROM chip.
267 config UBOOT_ROMSIZE_KB_4096
268 bool "4096 KB (4 MB)"
270 Choose this option if you have a 4096 KB (4 MB) ROM chip.
272 config UBOOT_ROMSIZE_KB_8192
273 bool "8192 KB (8 MB)"
275 Choose this option if you have a 8192 KB (8 MB) ROM chip.
277 config UBOOT_ROMSIZE_KB_16384
278 bool "16384 KB (16 MB)"
280 Choose this option if you have a 16384 KB (16 MB) ROM chip.
284 # Map the config names to an integer (KB).
285 config UBOOT_ROMSIZE_KB
287 default 512 if UBOOT_ROMSIZE_KB_512
288 default 1024 if UBOOT_ROMSIZE_KB_1024
289 default 2048 if UBOOT_ROMSIZE_KB_2048
290 default 4096 if UBOOT_ROMSIZE_KB_4096
291 default 8192 if UBOOT_ROMSIZE_KB_8192
292 default 16384 if UBOOT_ROMSIZE_KB_16384
294 # Map the config names to a hex value (bytes).
297 default 0x80000 if UBOOT_ROMSIZE_KB_512
298 default 0x100000 if UBOOT_ROMSIZE_KB_1024
299 default 0x200000 if UBOOT_ROMSIZE_KB_2048
300 default 0x400000 if UBOOT_ROMSIZE_KB_4096
301 default 0x800000 if UBOOT_ROMSIZE_KB_8192
302 default 0xc00000 if UBOOT_ROMSIZE_KB_12288
303 default 0x1000000 if UBOOT_ROMSIZE_KB_16384
306 bool "Platform requires Intel Management Engine"
308 Newer higher-end devices have an Intel Management Engine (ME)
309 which is a very large binary blob (typically 1.5MB) which is
310 required for the platform to work. This enforces a particular
311 SPI flash format. You will need to supply the me.bin file in
312 your board directory.
315 bool "Perform a simple RAM test after SDRAM initialisation"
317 If there is something wrong with SDRAM then the platform will
318 often crash within U-Boot or the kernel. This option enables a
319 very simple RAM test that quickly checks whether the SDRAM seems
320 to work correctly. It is not exhaustive but can save time by
321 detecting obvious failures.
323 config FLASH_DESCRIPTOR_FILE
324 string "Flash descriptor binary filename"
325 depends on HAVE_INTEL_ME
326 default "descriptor.bin"
328 The filename of the file to use as flash descriptor in the
332 string "Intel Management Engine binary filename"
333 depends on HAVE_INTEL_ME
336 The filename of the file to use as Intel Management Engine in the
340 bool "Add an Firmware Support Package binary"
343 Select this option to add an Firmware Support Package binary to
344 the resulting U-Boot image. It is a binary blob which U-Boot uses
345 to set up SDRAM and other chipset specific initialization.
347 Note: Without this binary U-Boot will not be able to set up its
348 SDRAM so will not boot.
351 string "Firmware Support Package binary filename"
355 The filename of the file to use as Firmware Support Package binary
356 in the board directory.
359 hex "Firmware Support Package binary location"
363 FSP is not Position Independent Code (PIC) and the whole FSP has to
364 be rebased if it is placed at a location which is different from the
365 perferred base address specified during the FSP build. Use Intel's
366 Binary Configuration Tool (BCT) to do the rebase.
368 The default base address of 0xfffc0000 indicates that the binary must
369 be located at offset 0xc0000 from the beginning of a 1MB flash device.
371 config FSP_TEMP_RAM_ADDR
376 Stack top address which is used in fsp_init() after DRAM is ready and
379 config FSP_SYS_MALLOC_F_LEN
384 Additional size of malloc() pool before relocation.
391 Most FSPs use UPD data region for some FSP customization. But there
392 are still some FSPs that might not even have UPD. For such FSPs,
393 override this to n in their platform Kconfig files.
395 config FSP_BROKEN_HOB
399 Indicate some buggy FSPs that does not report memory used by FSP
400 itself as reserved in the resource descriptor HOB. Select this to
401 tell U-Boot to do some additional work to ensure U-Boot relocation
402 do not overwrite the important boot service data which is used by
403 FSP, otherwise the subsequent call to fsp_notify() will fail.
405 config FSP_LOCKDOWN_SPI
409 Some Intel FSP (like Braswell) does SPI lock-down during the call
410 to fsp_notify(INIT_PHASE_BOOT). This option should be turned on
411 for such FSP and U-Boot will configure the SPI opcode registers
412 before the lock-down.
414 config ENABLE_MRC_CACHE
415 bool "Enable MRC cache"
416 depends on !EFI && !SYS_COREBOOT
418 Enable this feature to cause MRC data to be cached in NV storage
419 to be used for speeding up boot time on future reboots and/or
422 For platforms that use Intel FSP for the memory initialization,
423 please check FSP output HOB via U-Boot command 'fsp hob' to see
424 if there is FSP_NON_VOLATILE_STORAGE_HOB_GUID (asm/fsp/fsp_hob.h).
425 If such GUID does not exist, MRC cache is not avaiable on such
426 platform (eg: Intel Queensbay), which means selecting this option
427 here does not make any difference.
430 bool "Add a System Agent binary"
433 Select this option to add a System Agent binary to
434 the resulting U-Boot image. MRC stands for Memory Reference Code.
435 It is a binary blob which U-Boot uses to set up SDRAM.
437 Note: Without this binary U-Boot will not be able to set up its
438 SDRAM so will not boot.
445 Enable caching for the memory reference code binary. This uses an
446 MTRR (memory type range register) to turn on caching for the section
447 of SPI flash that contains the memory reference code. This makes
448 SDRAM init run faster.
450 config CACHE_MRC_SIZE_KB
455 Sets the size of the cached area for the memory reference code.
456 This ends at the end of SPI flash (address 0xffffffff) and is
457 measured in KB. Typically this is set to 512, providing for 0.5MB
460 config DCACHE_RAM_BASE
464 Sets the base of the data cache area in memory space. This is the
465 start address of the cache-as-RAM (CAR) area and the address varies
466 depending on the CPU. Once CAR is set up, read/write memory becomes
467 available at this address and can be used temporarily until SDRAM
470 config DCACHE_RAM_SIZE
475 Sets the total size of the data cache area in memory space. This
476 sets the size of the cache-as-RAM (CAR) area. Note that much of the
477 CAR space is required by the MRC. The CAR space available to U-Boot
478 is normally at the start and typically extends to 1/4 or 1/2 of the
481 config DCACHE_RAM_MRC_VAR_SIZE
485 This is the amount of CAR (Cache as RAM) reserved for use by the
486 memory reference code. This depends on the implementation of the
487 memory reference code and must be set correctly or the board will
491 bool "Add a Reference Code binary"
493 Select this option to add a Reference Code binary to the resulting
494 U-Boot image. This is an Intel binary blob that handles system
495 initialisation, in this case the PCH and System Agent.
497 Note: Without this binary (on platforms that need it such as
498 broadwell) U-Boot will be missing some critical setup steps.
499 Various peripherals may fail to work.
502 bool "Enable Symmetric Multiprocessing"
505 Enable use of more than one CPU in U-Boot and the Operating System
506 when loaded. Each CPU will be started up and information can be
507 obtained using the 'cpu' command. If this option is disabled, then
508 only one CPU will be enabled regardless of the number of CPUs
512 int "Maximum number of CPUs permitted"
516 When using multi-CPU chips it is possible for U-Boot to start up
517 more than one CPU. The stack memory used by all of these CPUs is
518 pre-allocated so at present U-Boot wants to know the maximum
519 number of CPUs that may be present. Set this to at least as high
520 as the number of CPUs in your system (it uses about 4KB of RAM for
528 Each additional CPU started by U-Boot requires its own stack. This
529 option sets the stack size used by each CPU and directly affects
530 the memory used by this initialisation process. Typically 4KB is
533 config CPU_INTEL_TURBO_NOT_PACKAGE_SCOPED
536 This option indicates that the turbo mode setting is not package
537 scoped. i.e. turbo_enable() needs to be called on not just the
538 bootstrap processor (BSP).
541 bool "Add a VGA BIOS image"
543 Select this option if you have a VGA BIOS image that you would
544 like to add to your ROM.
547 string "VGA BIOS image filename"
548 depends on HAVE_VGA_BIOS
551 The filename of the VGA BIOS image in the board directory.
554 hex "VGA BIOS image location"
555 depends on HAVE_VGA_BIOS
558 The location of VGA BIOS image in the SPI flash. For example, base
559 address of 0xfff90000 indicates that the image will be put at offset
560 0x90000 from the beginning of a 1MB flash device.
563 bool "Add a Video BIOS Table (VBT) image"
566 Select this option if you have a Video BIOS Table (VBT) image that
567 you would like to add to your ROM. This is normally required if you
568 are using an Intel FSP firmware that is complaint with spec 1.1 or
569 later to initialize the integrated graphics device (IGD).
571 Video BIOS Table, or VBT, provides platform and board specific
572 configuration information to the driver that is not discoverable
573 or available through other means. By other means the most used
574 method here is to read EDID table from the attached monitor, over
575 Display Data Channel (DDC) using two pin I2C serial interface. VBT
576 configuration is related to display hardware and is available via
577 the ACPI OpRegion or, on older systems, in the PCI ROM (Option ROM).
580 string "Video BIOS Table (VBT) image filename"
584 The filename of the file to use as Video BIOS Table (VBT) image
585 in the board directory.
588 hex "Video BIOS Table (VBT) image location"
592 The location of Video BIOS Table (VBT) image in the SPI flash. For
593 example, base address of 0xfff90000 indicates that the image will
594 be put at offset 0x90000 from the beginning of a 1MB flash device.
597 bool "Enable FSP framebuffer driver support"
598 depends on HAVE_VBT && DM_VIDEO
600 Turn on this option to enable a framebuffer driver when U-Boot is
601 using Video BIOS Table (VBT) image for FSP firmware to initialize
602 the integrated graphics device.
604 config ROM_TABLE_ADDR
608 All x86 tables happen to like the address range from 0x0f0000
609 to 0x100000. We use 0xf0000 as the starting address to store
610 those tables, including PIRQ routing table, Multi-Processor
611 table and ACPI table.
613 config ROM_TABLE_SIZE
618 depends on !EFI && !SYS_COREBOOT
620 config GENERATE_PIRQ_TABLE
621 bool "Generate a PIRQ table"
624 Generate a PIRQ routing table for this board. The PIRQ routing table
625 is generated by U-Boot in the system memory from 0xf0000 to 0xfffff
626 at every 16-byte boundary with a PCI IRQ routing signature ("$PIR").
627 It specifies the interrupt router information as well how all the PCI
628 devices' interrupt pins are wired to PIRQs.
630 config GENERATE_SFI_TABLE
631 bool "Generate a SFI (Simple Firmware Interface) table"
633 The Simple Firmware Interface (SFI) provides a lightweight method
634 for platform firmware to pass information to the operating system
635 via static tables in memory. Kernel SFI support is required to
636 boot on SFI-only platforms. If you have ACPI tables then these are
639 U-Boot writes this table in write_sfi_table() just before booting
642 For more information, see http://simplefirmware.org
644 config GENERATE_MP_TABLE
645 bool "Generate an MP (Multi-Processor) table"
648 Generate an MP (Multi-Processor) table for this board. The MP table
649 provides a way for the operating system to support for symmetric
650 multiprocessing as well as symmetric I/O interrupt handling with
651 the local APIC and I/O APIC.
653 config GENERATE_ACPI_TABLE
654 bool "Generate an ACPI (Advanced Configuration and Power Interface) table"
658 The Advanced Configuration and Power Interface (ACPI) specification
659 provides an open standard for device configuration and management
660 by the operating system. It defines platform-independent interfaces
661 for configuration and power management monitoring.
665 config HAVE_ACPI_RESUME
666 bool "Enable ACPI S3 resume"
668 Select this to enable ACPI S3 resume. S3 is an ACPI-defined sleeping
669 state where all system context is lost except system memory. U-Boot
670 is responsible for restoring the machine state as it was before sleep.
671 It needs restore the memory controller, without overwriting memory
672 which is not marked as reserved. For the peripherals which lose their
673 registers, U-Boot needs to write the original value. When everything
674 is done, U-Boot needs to find out the wakeup vector provided by OSes
677 config S3_VGA_ROM_RUN
678 bool "Re-run VGA option ROMs on S3 resume"
679 depends on HAVE_ACPI_RESUME
680 default y if HAVE_ACPI_RESUME
682 Execute VGA option ROMs in U-Boot when resuming from S3. Normally
683 this is needed when graphics console is being used in the kernel.
685 Turning it off can reduce some resume time, but be aware that your
686 graphics console won't work without VGA options ROMs. Set it to N
687 if your kernel is only on a serial console.
691 depends on HAVE_ACPI_RESUME
694 Estimated U-Boot's runtime stack size that needs to be reserved
695 during an ACPI S3 resume.
697 config MAX_PIRQ_LINKS
701 This variable specifies the number of PIRQ interrupt links which are
702 routable. On most older chipsets, this is 4, PIRQA through PIRQD.
703 Some newer chipsets offer more than four links, commonly up to PIRQH.
705 config IRQ_SLOT_COUNT
709 U-Boot can support up to 254 IRQ slot info in the PIRQ routing table
710 which in turns forms a table of exact 4KiB. The default value 128
711 should be enough for most boards. If this does not fit your board,
712 change it according to your needs.
714 config PCIE_ECAM_BASE
718 This is the memory-mapped address of PCI configuration space, which
719 is only available through the Enhanced Configuration Access
720 Mechanism (ECAM) with PCI Express. It can be set up almost
721 anywhere. Before it is set up, it is possible to access PCI
722 configuration space through I/O access, but memory access is more
723 convenient. Using this, PCI can be scanned and configured. This
724 should be set to a region that does not conflict with memory
725 assigned to PCI devices - i.e. the memory and prefetch regions, as
726 passed to pci_set_region().
728 config PCIE_ECAM_SIZE
732 This is the size of memory-mapped address of PCI configuration space,
733 which is only available through the Enhanced Configuration Access
734 Mechanism (ECAM) with PCI Express. Each bus consumes 1 MiB memory,
735 so a default 0x10000000 size covers all of the 256 buses which is the
736 maximum number of PCI buses as defined by the PCI specification.
742 Intel 8259 ISA compatible chipset incorporates two 8259 (master and
743 slave) interrupt controllers. Include this to have U-Boot set up
744 the interrupt correctly.
750 Intel 8254 timer contains three counters which have fixed uses.
751 Include this to have U-Boot set up the timer correctly.
754 bool "Support booting SeaBIOS"
756 SeaBIOS is an open source implementation of a 16-bit X86 BIOS.
757 It can run in an emulator or natively on X86 hardware with the use
758 of coreboot/U-Boot. By turning on this option, U-Boot prepares
759 all the configuration tables that are necessary to boot SeaBIOS.
761 Check http://www.seabios.org/SeaBIOS for details.
763 config HIGH_TABLE_SIZE
764 hex "Size of configuration tables which reside in high memory"
768 SeaBIOS itself resides in E seg and F seg, where U-Boot puts all
769 configuration tables like PIRQ/MP/ACPI. To avoid conflicts, U-Boot
770 puts a copy of configuration tables in high memory region which
771 is reserved on the stack before relocation. The region size is
772 determined by this option.
774 Increse it if the default size does not fit the board's needs.
775 This is most likely due to a large ACPI DSDT table is used.
777 source "arch/x86/lib/efi/Kconfig"