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"
87 Select to build a U-Boot capable of supporting Intel MID
88 (Mobile Internet Device) platform systems which do not have
89 the PCI legacy interfaces.
91 If you are building for a PC class system say N here.
93 Intel MID platforms are based on an Intel processor and
94 chipset which consume less power than most of the x86
97 # board-specific options below
98 source "board/advantech/Kconfig"
99 source "board/congatec/Kconfig"
100 source "board/coreboot/Kconfig"
101 source "board/dfi/Kconfig"
102 source "board/efi/Kconfig"
103 source "board/emulation/Kconfig"
104 source "board/google/Kconfig"
105 source "board/intel/Kconfig"
107 # platform-specific options below
108 source "arch/x86/cpu/baytrail/Kconfig"
109 source "arch/x86/cpu/broadwell/Kconfig"
110 source "arch/x86/cpu/coreboot/Kconfig"
111 source "arch/x86/cpu/ivybridge/Kconfig"
112 source "arch/x86/cpu/qemu/Kconfig"
113 source "arch/x86/cpu/quark/Kconfig"
114 source "arch/x86/cpu/queensbay/Kconfig"
116 # architecture-specific options below
121 config SYS_MALLOC_F_LEN
130 depends on X86_RESET_VECTOR
139 default 0xfed00000 if !HPET_ADDRESS_OVERRIDE
148 config X86_RESET_VECTOR
152 # The following options control where the 16-bit and 32-bit init lies
153 # If SPL is enabled then it normally holds this init code, and U-Boot proper
154 # is normally a 64-bit build.
156 # The 16-bit init refers to the reset vector and the small amount of code to
157 # get the processor into 32-bit mode. It may be in SPL or in U-Boot proper,
158 # or missing altogether if U-Boot is started from EFI or coreboot.
160 # The 32-bit init refers to processor init, running binary blobs including
161 # FSP, setting up interrupts and anything else that needs to be done in
162 # 32-bit code. It is normally in the same place as 16-bit init if that is
163 # enabled (i.e. they are both in SPL, or both in U-Boot proper).
164 config X86_16BIT_INIT
166 depends on X86_RESET_VECTOR
167 default y if X86_RESET_VECTOR && !SPL
169 This is enabled when 16-bit init is in U-Boot proper
171 config SPL_X86_16BIT_INIT
173 depends on X86_RESET_VECTOR
174 default y if X86_RESET_VECTOR && SPL
176 This is enabled when 16-bit init is in SPL
178 config X86_32BIT_INIT
180 depends on X86_RESET_VECTOR
181 default y if X86_RESET_VECTOR && !SPL
183 This is enabled when 32-bit init is in U-Boot proper
185 config SPL_X86_32BIT_INIT
187 depends on X86_RESET_VECTOR
188 default y if X86_RESET_VECTOR && SPL
190 This is enabled when 32-bit init is in SPL
192 config RESET_SEG_START
194 depends on X86_RESET_VECTOR
197 config RESET_SEG_SIZE
199 depends on X86_RESET_VECTOR
204 depends on X86_RESET_VECTOR
207 config SYS_X86_START16
209 depends on X86_RESET_VECTOR
212 config X86_LOAD_FROM_32_BIT
213 bool "Boot from a 32-bit program"
215 Define this to boot U-Boot from a 32-bit program which sets
216 the GDT differently. This can be used to boot directly from
217 any stage of coreboot, for example, bypassing the normal
218 payload-loading feature.
220 config BOARD_ROMSIZE_KB_512
222 config BOARD_ROMSIZE_KB_1024
224 config BOARD_ROMSIZE_KB_2048
226 config BOARD_ROMSIZE_KB_4096
228 config BOARD_ROMSIZE_KB_8192
230 config BOARD_ROMSIZE_KB_16384
234 prompt "ROM chip size"
235 depends on X86_RESET_VECTOR
236 default UBOOT_ROMSIZE_KB_512 if BOARD_ROMSIZE_KB_512
237 default UBOOT_ROMSIZE_KB_1024 if BOARD_ROMSIZE_KB_1024
238 default UBOOT_ROMSIZE_KB_2048 if BOARD_ROMSIZE_KB_2048
239 default UBOOT_ROMSIZE_KB_4096 if BOARD_ROMSIZE_KB_4096
240 default UBOOT_ROMSIZE_KB_8192 if BOARD_ROMSIZE_KB_8192
241 default UBOOT_ROMSIZE_KB_16384 if BOARD_ROMSIZE_KB_16384
243 Select the size of the ROM chip you intend to flash U-Boot on.
245 The build system will take care of creating a u-boot.rom file
246 of the matching size.
248 config UBOOT_ROMSIZE_KB_512
251 Choose this option if you have a 512 KB ROM chip.
253 config UBOOT_ROMSIZE_KB_1024
254 bool "1024 KB (1 MB)"
256 Choose this option if you have a 1024 KB (1 MB) ROM chip.
258 config UBOOT_ROMSIZE_KB_2048
259 bool "2048 KB (2 MB)"
261 Choose this option if you have a 2048 KB (2 MB) ROM chip.
263 config UBOOT_ROMSIZE_KB_4096
264 bool "4096 KB (4 MB)"
266 Choose this option if you have a 4096 KB (4 MB) ROM chip.
268 config UBOOT_ROMSIZE_KB_8192
269 bool "8192 KB (8 MB)"
271 Choose this option if you have a 8192 KB (8 MB) ROM chip.
273 config UBOOT_ROMSIZE_KB_16384
274 bool "16384 KB (16 MB)"
276 Choose this option if you have a 16384 KB (16 MB) ROM chip.
280 # Map the config names to an integer (KB).
281 config UBOOT_ROMSIZE_KB
283 default 512 if UBOOT_ROMSIZE_KB_512
284 default 1024 if UBOOT_ROMSIZE_KB_1024
285 default 2048 if UBOOT_ROMSIZE_KB_2048
286 default 4096 if UBOOT_ROMSIZE_KB_4096
287 default 8192 if UBOOT_ROMSIZE_KB_8192
288 default 16384 if UBOOT_ROMSIZE_KB_16384
290 # Map the config names to a hex value (bytes).
293 default 0x80000 if UBOOT_ROMSIZE_KB_512
294 default 0x100000 if UBOOT_ROMSIZE_KB_1024
295 default 0x200000 if UBOOT_ROMSIZE_KB_2048
296 default 0x400000 if UBOOT_ROMSIZE_KB_4096
297 default 0x800000 if UBOOT_ROMSIZE_KB_8192
298 default 0xc00000 if UBOOT_ROMSIZE_KB_12288
299 default 0x1000000 if UBOOT_ROMSIZE_KB_16384
302 bool "Platform requires Intel Management Engine"
304 Newer higher-end devices have an Intel Management Engine (ME)
305 which is a very large binary blob (typically 1.5MB) which is
306 required for the platform to work. This enforces a particular
307 SPI flash format. You will need to supply the me.bin file in
308 your board directory.
311 bool "Perform a simple RAM test after SDRAM initialisation"
313 If there is something wrong with SDRAM then the platform will
314 often crash within U-Boot or the kernel. This option enables a
315 very simple RAM test that quickly checks whether the SDRAM seems
316 to work correctly. It is not exhaustive but can save time by
317 detecting obvious failures.
320 bool "Add an Firmware Support Package binary"
323 Select this option to add an Firmware Support Package binary to
324 the resulting U-Boot image. It is a binary blob which U-Boot uses
325 to set up SDRAM and other chipset specific initialization.
327 Note: Without this binary U-Boot will not be able to set up its
328 SDRAM so will not boot.
331 string "Firmware Support Package binary filename"
335 The filename of the file to use as Firmware Support Package binary
336 in the board directory.
339 hex "Firmware Support Package binary location"
343 FSP is not Position Independent Code (PIC) and the whole FSP has to
344 be rebased if it is placed at a location which is different from the
345 perferred base address specified during the FSP build. Use Intel's
346 Binary Configuration Tool (BCT) to do the rebase.
348 The default base address of 0xfffc0000 indicates that the binary must
349 be located at offset 0xc0000 from the beginning of a 1MB flash device.
351 config FSP_TEMP_RAM_ADDR
356 Stack top address which is used in fsp_init() after DRAM is ready and
359 config FSP_SYS_MALLOC_F_LEN
364 Additional size of malloc() pool before relocation.
371 Most FSPs use UPD data region for some FSP customization. But there
372 are still some FSPs that might not even have UPD. For such FSPs,
373 override this to n in their platform Kconfig files.
375 config FSP_BROKEN_HOB
379 Indicate some buggy FSPs that does not report memory used by FSP
380 itself as reserved in the resource descriptor HOB. Select this to
381 tell U-Boot to do some additional work to ensure U-Boot relocation
382 do not overwrite the important boot service data which is used by
383 FSP, otherwise the subsequent call to fsp_notify() will fail.
385 config ENABLE_MRC_CACHE
386 bool "Enable MRC cache"
387 depends on !EFI && !SYS_COREBOOT
389 Enable this feature to cause MRC data to be cached in NV storage
390 to be used for speeding up boot time on future reboots and/or
393 For platforms that use Intel FSP for the memory initialization,
394 please check FSP output HOB via U-Boot command 'fsp hob' to see
395 if there is FSP_NON_VOLATILE_STORAGE_HOB_GUID (asm/fsp/fsp_hob.h).
396 If such GUID does not exist, MRC cache is not avaiable on such
397 platform (eg: Intel Queensbay), which means selecting this option
398 here does not make any difference.
401 bool "Add a System Agent binary"
404 Select this option to add a System Agent binary to
405 the resulting U-Boot image. MRC stands for Memory Reference Code.
406 It is a binary blob which U-Boot uses to set up SDRAM.
408 Note: Without this binary U-Boot will not be able to set up its
409 SDRAM so will not boot.
416 Enable caching for the memory reference code binary. This uses an
417 MTRR (memory type range register) to turn on caching for the section
418 of SPI flash that contains the memory reference code. This makes
419 SDRAM init run faster.
421 config CACHE_MRC_SIZE_KB
426 Sets the size of the cached area for the memory reference code.
427 This ends at the end of SPI flash (address 0xffffffff) and is
428 measured in KB. Typically this is set to 512, providing for 0.5MB
431 config DCACHE_RAM_BASE
435 Sets the base of the data cache area in memory space. This is the
436 start address of the cache-as-RAM (CAR) area and the address varies
437 depending on the CPU. Once CAR is set up, read/write memory becomes
438 available at this address and can be used temporarily until SDRAM
441 config DCACHE_RAM_SIZE
446 Sets the total size of the data cache area in memory space. This
447 sets the size of the cache-as-RAM (CAR) area. Note that much of the
448 CAR space is required by the MRC. The CAR space available to U-Boot
449 is normally at the start and typically extends to 1/4 or 1/2 of the
452 config DCACHE_RAM_MRC_VAR_SIZE
456 This is the amount of CAR (Cache as RAM) reserved for use by the
457 memory reference code. This depends on the implementation of the
458 memory reference code and must be set correctly or the board will
462 bool "Add a Reference Code binary"
464 Select this option to add a Reference Code binary to the resulting
465 U-Boot image. This is an Intel binary blob that handles system
466 initialisation, in this case the PCH and System Agent.
468 Note: Without this binary (on platforms that need it such as
469 broadwell) U-Boot will be missing some critical setup steps.
470 Various peripherals may fail to work.
473 bool "Enable Symmetric Multiprocessing"
476 Enable use of more than one CPU in U-Boot and the Operating System
477 when loaded. Each CPU will be started up and information can be
478 obtained using the 'cpu' command. If this option is disabled, then
479 only one CPU will be enabled regardless of the number of CPUs
483 int "Maximum number of CPUs permitted"
487 When using multi-CPU chips it is possible for U-Boot to start up
488 more than one CPU. The stack memory used by all of these CPUs is
489 pre-allocated so at present U-Boot wants to know the maximum
490 number of CPUs that may be present. Set this to at least as high
491 as the number of CPUs in your system (it uses about 4KB of RAM for
499 Each additional CPU started by U-Boot requires its own stack. This
500 option sets the stack size used by each CPU and directly affects
501 the memory used by this initialisation process. Typically 4KB is
505 bool "Add a VGA BIOS image"
507 Select this option if you have a VGA BIOS image that you would
508 like to add to your ROM.
511 string "VGA BIOS image filename"
512 depends on HAVE_VGA_BIOS
515 The filename of the VGA BIOS image in the board directory.
518 hex "VGA BIOS image location"
519 depends on HAVE_VGA_BIOS
522 The location of VGA BIOS image in the SPI flash. For example, base
523 address of 0xfff90000 indicates that the image will be put at offset
524 0x90000 from the beginning of a 1MB flash device.
527 depends on !EFI && !SYS_COREBOOT
529 config GENERATE_PIRQ_TABLE
530 bool "Generate a PIRQ table"
533 Generate a PIRQ routing table for this board. The PIRQ routing table
534 is generated by U-Boot in the system memory from 0xf0000 to 0xfffff
535 at every 16-byte boundary with a PCI IRQ routing signature ("$PIR").
536 It specifies the interrupt router information as well how all the PCI
537 devices' interrupt pins are wired to PIRQs.
539 config GENERATE_SFI_TABLE
540 bool "Generate a SFI (Simple Firmware Interface) table"
542 The Simple Firmware Interface (SFI) provides a lightweight method
543 for platform firmware to pass information to the operating system
544 via static tables in memory. Kernel SFI support is required to
545 boot on SFI-only platforms. If you have ACPI tables then these are
548 U-Boot writes this table in write_sfi_table() just before booting
551 For more information, see http://simplefirmware.org
553 config GENERATE_MP_TABLE
554 bool "Generate an MP (Multi-Processor) table"
557 Generate an MP (Multi-Processor) table for this board. The MP table
558 provides a way for the operating system to support for symmetric
559 multiprocessing as well as symmetric I/O interrupt handling with
560 the local APIC and I/O APIC.
562 config GENERATE_ACPI_TABLE
563 bool "Generate an ACPI (Advanced Configuration and Power Interface) table"
567 The Advanced Configuration and Power Interface (ACPI) specification
568 provides an open standard for device configuration and management
569 by the operating system. It defines platform-independent interfaces
570 for configuration and power management monitoring.
574 config MAX_PIRQ_LINKS
578 This variable specifies the number of PIRQ interrupt links which are
579 routable. On most older chipsets, this is 4, PIRQA through PIRQD.
580 Some newer chipsets offer more than four links, commonly up to PIRQH.
582 config IRQ_SLOT_COUNT
586 U-Boot can support up to 254 IRQ slot info in the PIRQ routing table
587 which in turns forms a table of exact 4KiB. The default value 128
588 should be enough for most boards. If this does not fit your board,
589 change it according to your needs.
591 config PCIE_ECAM_BASE
595 This is the memory-mapped address of PCI configuration space, which
596 is only available through the Enhanced Configuration Access
597 Mechanism (ECAM) with PCI Express. It can be set up almost
598 anywhere. Before it is set up, it is possible to access PCI
599 configuration space through I/O access, but memory access is more
600 convenient. Using this, PCI can be scanned and configured. This
601 should be set to a region that does not conflict with memory
602 assigned to PCI devices - i.e. the memory and prefetch regions, as
603 passed to pci_set_region().
605 config PCIE_ECAM_SIZE
609 This is the size of memory-mapped address of PCI configuration space,
610 which is only available through the Enhanced Configuration Access
611 Mechanism (ECAM) with PCI Express. Each bus consumes 1 MiB memory,
612 so a default 0x10000000 size covers all of the 256 buses which is the
613 maximum number of PCI buses as defined by the PCI specification.
619 Intel 8259 ISA compatible chipset incorporates two 8259 (master and
620 slave) interrupt controllers. Include this to have U-Boot set up
621 the interrupt correctly.
627 Intel 8254 timer contains three counters which have fixed uses.
628 Include this to have U-Boot set up the timer correctly.
631 bool "Support booting SeaBIOS"
633 SeaBIOS is an open source implementation of a 16-bit X86 BIOS.
634 It can run in an emulator or natively on X86 hardware with the use
635 of coreboot/U-Boot. By turning on this option, U-Boot prepares
636 all the configuration tables that are necessary to boot SeaBIOS.
638 Check http://www.seabios.org/SeaBIOS for details.
640 config HIGH_TABLE_SIZE
641 hex "Size of configuration tables which reside in high memory"
645 SeaBIOS itself resides in E seg and F seg, where U-Boot puts all
646 configuration tables like PIRQ/MP/ACPI. To avoid conflicts, U-Boot
647 puts a copy of configuration tables in high memory region which
648 is reserved on the stack before relocation. The region size is
649 determined by this option.
651 Increse it if the default size does not fit the board's needs.
652 This is most likely due to a large ACPI DSDT table is used.
654 source "arch/x86/lib/efi/Kconfig"