xref: /openbmc/u-boot/arch/x86/Kconfig (revision 2d934e5703b712686c3ec67f6d5eeb137c68805d)
1dd84058dSMasahiro Yamadamenu "x86 architecture"
2dd84058dSMasahiro Yamada	depends on X86
3dd84058dSMasahiro Yamada
4dd84058dSMasahiro Yamadaconfig SYS_ARCH
5dd84058dSMasahiro Yamada	default "x86"
6dd84058dSMasahiro Yamada
745ccec8fSMasahiro Yamadaconfig USE_PRIVATE_LIBGCC
845ccec8fSMasahiro Yamada	default y
945ccec8fSMasahiro Yamada
10dd84058dSMasahiro Yamadachoice
11dd84058dSMasahiro Yamada	prompt "Target select"
12dd84058dSMasahiro Yamada
13dd84058dSMasahiro Yamadaconfig TARGET_COREBOOT
14dd84058dSMasahiro Yamada	bool "Support coreboot"
158ef07571SSimon Glass	help
168ef07571SSimon Glass	  This target is used for running U-Boot on top of Coreboot. In
178ef07571SSimon Glass	  this case Coreboot does the early inititalisation, and U-Boot
188ef07571SSimon Glass	  takes over once the RAM, video and CPU are fully running.
198ef07571SSimon Glass	  U-Boot is loaded as a fallback payload from Coreboot, in
208ef07571SSimon Glass	  Coreboot terminology. This method was used for the Chromebook
218ef07571SSimon Glass	  Pixel when launched.
228ef07571SSimon Glass
238ef07571SSimon Glassconfig TARGET_CHROMEBOOK_LINK
248ef07571SSimon Glass	bool "Support Chromebook link"
258ef07571SSimon Glass	help
268ef07571SSimon Glass	  This is the Chromebook Pixel released in 2013. It uses an Intel
278ef07571SSimon Glass	  i5 Ivybridge which is a die-shrink of Sandybridge, with 4GB of
288ef07571SSimon Glass	  SDRAM. It has a Panther Point platform controller hub, PCIe
298ef07571SSimon Glass	  WiFi and Bluetooth. It also includes a 720p webcam, USB SD
308ef07571SSimon Glass	  reader, microphone and speakers, display port and 32GB SATA
318ef07571SSimon Glass	  solid state drive. There is a Chrome OS EC connected on LPC,
328ef07571SSimon Glass	  and it provides a 2560x1700 high resolution touch-enabled LCD
338ef07571SSimon Glass	  display.
34dd84058dSMasahiro Yamada
3558f542deSBin Mengconfig TARGET_CROWNBAY
3658f542deSBin Meng	bool "Support Intel Crown Bay CRB"
3758f542deSBin Meng	help
3858f542deSBin Meng	  This is the Intel Crown Bay Customer Reference Board. It contains
3958f542deSBin Meng	  the Intel Atom Processor E6xx populated on the COM Express module
4058f542deSBin Meng	  with 1GB DDR2 soldered down memory and a carrier board with the
4158f542deSBin Meng	  Intel Platform Controller Hub EG20T, other system components and
4258f542deSBin Meng	  peripheral connectors for PCIe/SATA/USB/LAN/SD/UART/Audio/LVDS.
4358f542deSBin Meng
44dd84058dSMasahiro Yamadaendchoice
45dd84058dSMasahiro Yamada
4670a09c6cSSimon Glassconfig RAMBASE
4770a09c6cSSimon Glass	hex
4870a09c6cSSimon Glass	default 0x100000
4970a09c6cSSimon Glass
5070a09c6cSSimon Glassconfig XIP_ROM_SIZE
5170a09c6cSSimon Glass	hex
527698d36aSBin Meng	depends on X86_RESET_VECTOR
53bbd43d65SSimon Glass	default ROM_SIZE
5470a09c6cSSimon Glass
5570a09c6cSSimon Glassconfig CPU_ADDR_BITS
5670a09c6cSSimon Glass	int
5770a09c6cSSimon Glass	default 36
5870a09c6cSSimon Glass
5965dd74a6SSimon Glassconfig HPET_ADDRESS
6065dd74a6SSimon Glass	hex
6165dd74a6SSimon Glass	default 0xfed00000 if !HPET_ADDRESS_OVERRIDE
6265dd74a6SSimon Glass
6365dd74a6SSimon Glassconfig SMM_TSEG
6465dd74a6SSimon Glass	bool
6565dd74a6SSimon Glass	default n
6665dd74a6SSimon Glass
6765dd74a6SSimon Glassconfig SMM_TSEG_SIZE
6865dd74a6SSimon Glass	hex
6965dd74a6SSimon Glass
708cb20cccSBin Mengconfig X86_RESET_VECTOR
718cb20cccSBin Meng	bool
728cb20cccSBin Meng	default n
738cb20cccSBin Meng
748cb20cccSBin Mengconfig SYS_X86_START16
758cb20cccSBin Meng	hex
768cb20cccSBin Meng	depends on X86_RESET_VECTOR
778cb20cccSBin Meng	default 0xfffff800
788cb20cccSBin Meng
7964542f46SBin Mengconfig BOARD_ROMSIZE_KB_512
8064542f46SBin Meng	bool
8164542f46SBin Mengconfig BOARD_ROMSIZE_KB_1024
8264542f46SBin Meng	bool
8364542f46SBin Mengconfig BOARD_ROMSIZE_KB_2048
8464542f46SBin Meng	bool
8564542f46SBin Mengconfig BOARD_ROMSIZE_KB_4096
8664542f46SBin Meng	bool
8764542f46SBin Mengconfig BOARD_ROMSIZE_KB_8192
8864542f46SBin Meng	bool
8964542f46SBin Mengconfig BOARD_ROMSIZE_KB_16384
9064542f46SBin Meng	bool
9164542f46SBin Meng
9264542f46SBin Mengchoice
9364542f46SBin Meng	prompt "ROM chip size"
947698d36aSBin Meng	depends on X86_RESET_VECTOR
9564542f46SBin Meng	default UBOOT_ROMSIZE_KB_512 if BOARD_ROMSIZE_KB_512
9664542f46SBin Meng	default UBOOT_ROMSIZE_KB_1024 if BOARD_ROMSIZE_KB_1024
9764542f46SBin Meng	default UBOOT_ROMSIZE_KB_2048 if BOARD_ROMSIZE_KB_2048
9864542f46SBin Meng	default UBOOT_ROMSIZE_KB_4096 if BOARD_ROMSIZE_KB_4096
9964542f46SBin Meng	default UBOOT_ROMSIZE_KB_8192 if BOARD_ROMSIZE_KB_8192
10064542f46SBin Meng	default UBOOT_ROMSIZE_KB_16384 if BOARD_ROMSIZE_KB_16384
10164542f46SBin Meng	help
10264542f46SBin Meng	  Select the size of the ROM chip you intend to flash U-Boot on.
10364542f46SBin Meng
10464542f46SBin Meng	  The build system will take care of creating a u-boot.rom file
10564542f46SBin Meng	  of the matching size.
10664542f46SBin Meng
10764542f46SBin Mengconfig UBOOT_ROMSIZE_KB_512
10864542f46SBin Meng	bool "512 KB"
10964542f46SBin Meng	help
11064542f46SBin Meng	  Choose this option if you have a 512 KB ROM chip.
11164542f46SBin Meng
11264542f46SBin Mengconfig UBOOT_ROMSIZE_KB_1024
11364542f46SBin Meng	bool "1024 KB (1 MB)"
11464542f46SBin Meng	help
11564542f46SBin Meng	  Choose this option if you have a 1024 KB (1 MB) ROM chip.
11664542f46SBin Meng
11764542f46SBin Mengconfig UBOOT_ROMSIZE_KB_2048
11864542f46SBin Meng	bool "2048 KB (2 MB)"
11964542f46SBin Meng	help
12064542f46SBin Meng	  Choose this option if you have a 2048 KB (2 MB) ROM chip.
12164542f46SBin Meng
12264542f46SBin Mengconfig UBOOT_ROMSIZE_KB_4096
12364542f46SBin Meng	bool "4096 KB (4 MB)"
12464542f46SBin Meng	help
12564542f46SBin Meng	  Choose this option if you have a 4096 KB (4 MB) ROM chip.
12664542f46SBin Meng
12764542f46SBin Mengconfig UBOOT_ROMSIZE_KB_8192
12864542f46SBin Meng	bool "8192 KB (8 MB)"
12964542f46SBin Meng	help
13064542f46SBin Meng	  Choose this option if you have a 8192 KB (8 MB) ROM chip.
13164542f46SBin Meng
13264542f46SBin Mengconfig UBOOT_ROMSIZE_KB_16384
13364542f46SBin Meng	bool "16384 KB (16 MB)"
13464542f46SBin Meng	help
13564542f46SBin Meng	  Choose this option if you have a 16384 KB (16 MB) ROM chip.
13664542f46SBin Meng
13764542f46SBin Mengendchoice
13864542f46SBin Meng
13964542f46SBin Meng# Map the config names to an integer (KB).
14064542f46SBin Mengconfig UBOOT_ROMSIZE_KB
14164542f46SBin Meng	int
14264542f46SBin Meng	default 512 if UBOOT_ROMSIZE_KB_512
14364542f46SBin Meng	default 1024 if UBOOT_ROMSIZE_KB_1024
14464542f46SBin Meng	default 2048 if UBOOT_ROMSIZE_KB_2048
14564542f46SBin Meng	default 4096 if UBOOT_ROMSIZE_KB_4096
14664542f46SBin Meng	default 8192 if UBOOT_ROMSIZE_KB_8192
14764542f46SBin Meng	default 16384 if UBOOT_ROMSIZE_KB_16384
14864542f46SBin Meng
14964542f46SBin Meng# Map the config names to a hex value (bytes).
150fce7b276SSimon Glassconfig ROM_SIZE
151fce7b276SSimon Glass	hex
15264542f46SBin Meng	default 0x80000 if UBOOT_ROMSIZE_KB_512
15364542f46SBin Meng	default 0x100000 if UBOOT_ROMSIZE_KB_1024
15464542f46SBin Meng	default 0x200000 if UBOOT_ROMSIZE_KB_2048
15564542f46SBin Meng	default 0x400000 if UBOOT_ROMSIZE_KB_4096
15664542f46SBin Meng	default 0x800000 if UBOOT_ROMSIZE_KB_8192
15764542f46SBin Meng	default 0xc00000 if UBOOT_ROMSIZE_KB_12288
15864542f46SBin Meng	default 0x1000000 if UBOOT_ROMSIZE_KB_16384
159fce7b276SSimon Glass
160fce7b276SSimon Glassconfig HAVE_INTEL_ME
161fce7b276SSimon Glass	bool "Platform requires Intel Management Engine"
162fce7b276SSimon Glass	help
163fce7b276SSimon Glass	  Newer higher-end devices have an Intel Management Engine (ME)
164fce7b276SSimon Glass	  which is a very large binary blob (typically 1.5MB) which is
165fce7b276SSimon Glass	  required for the platform to work. This enforces a particular
166fce7b276SSimon Glass	  SPI flash format. You will need to supply the me.bin file in
167fce7b276SSimon Glass	  your board directory.
168fce7b276SSimon Glass
16965dd74a6SSimon Glassconfig X86_RAMTEST
17065dd74a6SSimon Glass	bool "Perform a simple RAM test after SDRAM initialisation"
17165dd74a6SSimon Glass	help
17265dd74a6SSimon Glass	  If there is something wrong with SDRAM then the platform will
17365dd74a6SSimon Glass	  often crash within U-Boot or the kernel. This option enables a
17465dd74a6SSimon Glass	  very simple RAM test that quickly checks whether the SDRAM seems
17565dd74a6SSimon Glass	  to work correctly. It is not exhaustive but can save time by
17665dd74a6SSimon Glass	  detecting obvious failures.
17765dd74a6SSimon Glass
17822465fc4SSimon Glassconfig MARK_GRAPHICS_MEM_WRCOMB
17922465fc4SSimon Glass	bool "Mark graphics memory as write-combining."
18022465fc4SSimon Glass	default n
18122465fc4SSimon Glass	help
18222465fc4SSimon Glass	 The graphics performance may increase if the graphics
18322465fc4SSimon Glass	 memory is set as write-combining cache type. This option
18422465fc4SSimon Glass	 enables marking the graphics memory as write-combining.
18522465fc4SSimon Glass
18622465fc4SSimon Glassmenu "Display"
18722465fc4SSimon Glass
18822465fc4SSimon Glassconfig FRAMEBUFFER_SET_VESA_MODE
18922465fc4SSimon Glass	prompt "Set framebuffer graphics resolution"
19022465fc4SSimon Glass	bool
19122465fc4SSimon Glass	help
19222465fc4SSimon Glass	  Set VESA/native framebuffer mode (needed for bootsplash and graphical framebuffer console)
19322465fc4SSimon Glass
19422465fc4SSimon Glasschoice
19522465fc4SSimon Glass	prompt "framebuffer graphics resolution"
19622465fc4SSimon Glass	default FRAMEBUFFER_VESA_MODE_117
19722465fc4SSimon Glass	depends on FRAMEBUFFER_SET_VESA_MODE
19822465fc4SSimon Glass	help
19922465fc4SSimon Glass	  This option sets the resolution used for the coreboot framebuffer (and
20022465fc4SSimon Glass	  bootsplash screen).
20122465fc4SSimon Glass
20222465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_100
20322465fc4SSimon Glass	bool "640x400 256-color"
20422465fc4SSimon Glass
20522465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_101
20622465fc4SSimon Glass	bool "640x480 256-color"
20722465fc4SSimon Glass
20822465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_102
20922465fc4SSimon Glass	bool "800x600 16-color"
21022465fc4SSimon Glass
21122465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_103
21222465fc4SSimon Glass	bool "800x600 256-color"
21322465fc4SSimon Glass
21422465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_104
21522465fc4SSimon Glass	bool "1024x768 16-color"
21622465fc4SSimon Glass
21722465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_105
21822465fc4SSimon Glass	bool "1024x7686 256-color"
21922465fc4SSimon Glass
22022465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_106
22122465fc4SSimon Glass	bool "1280x1024 16-color"
22222465fc4SSimon Glass
22322465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_107
22422465fc4SSimon Glass	bool "1280x1024 256-color"
22522465fc4SSimon Glass
22622465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_108
22722465fc4SSimon Glass	bool "80x60 text"
22822465fc4SSimon Glass
22922465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_109
23022465fc4SSimon Glass	bool "132x25 text"
23122465fc4SSimon Glass
23222465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10A
23322465fc4SSimon Glass	bool "132x43 text"
23422465fc4SSimon Glass
23522465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10B
23622465fc4SSimon Glass	bool "132x50 text"
23722465fc4SSimon Glass
23822465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10C
23922465fc4SSimon Glass	bool "132x60 text"
24022465fc4SSimon Glass
24122465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10D
24222465fc4SSimon Glass	bool "320x200 32k-color (1:5:5:5)"
24322465fc4SSimon Glass
24422465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10E
24522465fc4SSimon Glass	bool "320x200 64k-color (5:6:5)"
24622465fc4SSimon Glass
24722465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_10F
24822465fc4SSimon Glass	bool "320x200 16.8M-color (8:8:8)"
24922465fc4SSimon Glass
25022465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_110
25122465fc4SSimon Glass	bool "640x480 32k-color (1:5:5:5)"
25222465fc4SSimon Glass
25322465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_111
25422465fc4SSimon Glass	bool "640x480 64k-color (5:6:5)"
25522465fc4SSimon Glass
25622465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_112
25722465fc4SSimon Glass	bool "640x480 16.8M-color (8:8:8)"
25822465fc4SSimon Glass
25922465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_113
26022465fc4SSimon Glass	bool "800x600 32k-color (1:5:5:5)"
26122465fc4SSimon Glass
26222465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_114
26322465fc4SSimon Glass	bool "800x600 64k-color (5:6:5)"
26422465fc4SSimon Glass
26522465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_115
26622465fc4SSimon Glass	bool "800x600 16.8M-color (8:8:8)"
26722465fc4SSimon Glass
26822465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_116
26922465fc4SSimon Glass	bool "1024x768 32k-color (1:5:5:5)"
27022465fc4SSimon Glass
27122465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_117
27222465fc4SSimon Glass	bool "1024x768 64k-color (5:6:5)"
27322465fc4SSimon Glass
27422465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_118
27522465fc4SSimon Glass	bool "1024x768 16.8M-color (8:8:8)"
27622465fc4SSimon Glass
27722465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_119
27822465fc4SSimon Glass	bool "1280x1024 32k-color (1:5:5:5)"
27922465fc4SSimon Glass
28022465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_11A
28122465fc4SSimon Glass	bool "1280x1024 64k-color (5:6:5)"
28222465fc4SSimon Glass
28322465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_11B
28422465fc4SSimon Glass	bool "1280x1024 16.8M-color (8:8:8)"
28522465fc4SSimon Glass
28622465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE_USER
28722465fc4SSimon Glass	bool "Manually select VESA mode"
28822465fc4SSimon Glass
28922465fc4SSimon Glassendchoice
29022465fc4SSimon Glass
29122465fc4SSimon Glass# Map the config names to an integer (KB).
29222465fc4SSimon Glassconfig FRAMEBUFFER_VESA_MODE
29322465fc4SSimon Glass	prompt "VESA mode" if FRAMEBUFFER_VESA_MODE_USER
29422465fc4SSimon Glass	hex
29522465fc4SSimon Glass	default 0x100 if FRAMEBUFFER_VESA_MODE_100
29622465fc4SSimon Glass	default 0x101 if FRAMEBUFFER_VESA_MODE_101
29722465fc4SSimon Glass	default 0x102 if FRAMEBUFFER_VESA_MODE_102
29822465fc4SSimon Glass	default 0x103 if FRAMEBUFFER_VESA_MODE_103
29922465fc4SSimon Glass	default 0x104 if FRAMEBUFFER_VESA_MODE_104
30022465fc4SSimon Glass	default 0x105 if FRAMEBUFFER_VESA_MODE_105
30122465fc4SSimon Glass	default 0x106 if FRAMEBUFFER_VESA_MODE_106
30222465fc4SSimon Glass	default 0x107 if FRAMEBUFFER_VESA_MODE_107
30322465fc4SSimon Glass	default 0x108 if FRAMEBUFFER_VESA_MODE_108
30422465fc4SSimon Glass	default 0x109 if FRAMEBUFFER_VESA_MODE_109
30522465fc4SSimon Glass	default 0x10A if FRAMEBUFFER_VESA_MODE_10A
30622465fc4SSimon Glass	default 0x10B if FRAMEBUFFER_VESA_MODE_10B
30722465fc4SSimon Glass	default 0x10C if FRAMEBUFFER_VESA_MODE_10C
30822465fc4SSimon Glass	default 0x10D if FRAMEBUFFER_VESA_MODE_10D
30922465fc4SSimon Glass	default 0x10E if FRAMEBUFFER_VESA_MODE_10E
31022465fc4SSimon Glass	default 0x10F if FRAMEBUFFER_VESA_MODE_10F
31122465fc4SSimon Glass	default 0x110 if FRAMEBUFFER_VESA_MODE_110
31222465fc4SSimon Glass	default 0x111 if FRAMEBUFFER_VESA_MODE_111
31322465fc4SSimon Glass	default 0x112 if FRAMEBUFFER_VESA_MODE_112
31422465fc4SSimon Glass	default 0x113 if FRAMEBUFFER_VESA_MODE_113
31522465fc4SSimon Glass	default 0x114 if FRAMEBUFFER_VESA_MODE_114
31622465fc4SSimon Glass	default 0x115 if FRAMEBUFFER_VESA_MODE_115
31722465fc4SSimon Glass	default 0x116 if FRAMEBUFFER_VESA_MODE_116
31822465fc4SSimon Glass	default 0x117 if FRAMEBUFFER_VESA_MODE_117
31922465fc4SSimon Glass	default 0x118 if FRAMEBUFFER_VESA_MODE_118
32022465fc4SSimon Glass	default 0x119 if FRAMEBUFFER_VESA_MODE_119
32122465fc4SSimon Glass	default 0x11A if FRAMEBUFFER_VESA_MODE_11A
32222465fc4SSimon Glass	default 0x11B if FRAMEBUFFER_VESA_MODE_11B
32322465fc4SSimon Glass	default 0x117 if FRAMEBUFFER_VESA_MODE_USER
32422465fc4SSimon Glass
32522465fc4SSimon Glassendmenu
32622465fc4SSimon Glass
3273ba6a0f4SBin Mengconfig TSC_CALIBRATION_BYPASS
3283ba6a0f4SBin Meng	bool "Bypass Time-Stamp Counter (TSC) calibration"
3293ba6a0f4SBin Meng	default n
3303ba6a0f4SBin Meng	help
3313ba6a0f4SBin Meng	  By default U-Boot automatically calibrates Time-Stamp Counter (TSC)
3323ba6a0f4SBin Meng	  running frequency via Model-Specific Register (MSR) and Programmable
3333ba6a0f4SBin Meng	  Interval Timer (PIT). If the calibration does not work on your board,
3343ba6a0f4SBin Meng	  select this option and provide a hardcoded TSC running frequency with
3353ba6a0f4SBin Meng	  CONFIG_TSC_FREQ_IN_MHZ below.
3363ba6a0f4SBin Meng
3373ba6a0f4SBin Meng	  Normally this option should be turned on in a simulation environment
3383ba6a0f4SBin Meng	  like qemu.
3393ba6a0f4SBin Meng
3403ba6a0f4SBin Mengconfig TSC_FREQ_IN_MHZ
3413ba6a0f4SBin Meng	int "Time-Stamp Counter (TSC) running frequency in MHz"
3423ba6a0f4SBin Meng	depends on TSC_CALIBRATION_BYPASS
3433ba6a0f4SBin Meng	default 1000
3443ba6a0f4SBin Meng	help
3453ba6a0f4SBin Meng	  The running frequency in MHz of Time-Stamp Counter (TSC).
3463ba6a0f4SBin Meng
3479d74f034SBin Mengsource "arch/x86/cpu/coreboot/Kconfig"
3489d74f034SBin Meng
3498ef07571SSimon Glasssource "arch/x86/cpu/ivybridge/Kconfig"
3508ef07571SSimon Glass
35158f542deSBin Mengsource "arch/x86/cpu/queensbay/Kconfig"
35258f542deSBin Meng
353fe5b9b44SSimon Glasssource "board/coreboot/coreboot/Kconfig"
354dd84058dSMasahiro Yamada
3558ef07571SSimon Glasssource "board/google/chromebook_link/Kconfig"
3568ef07571SSimon Glass
35758f542deSBin Mengsource "board/intel/crownbay/Kconfig"
35858f542deSBin Meng
359*2d934e57SSimon Glassconfig PCIE_ECAM_BASE
360*2d934e57SSimon Glass	hex
361*2d934e57SSimon Glass    default 0xe0000000
362*2d934e57SSimon Glass	help
363*2d934e57SSimon Glass	  This is the memory-mapped address of PCI configuration space, which
364*2d934e57SSimon Glass	  is only available through the Enhanced Configuration Access
365*2d934e57SSimon Glass	  Mechanism (ECAM) with PCI Express. It can be set up almost
366*2d934e57SSimon Glass	  anywhere. Before it is set up, it is possible to access PCI
367*2d934e57SSimon Glass	  configuration space through I/O access, but memory access is more
368*2d934e57SSimon Glass	  convenient. Using this, PCI can be scanned and configured. This
369*2d934e57SSimon Glass	  should be set to a region that does not conflict with memory
370*2d934e57SSimon Glass	  assigned to PCI devices - i.e. the memory and prefetch regions, as
371*2d934e57SSimon Glass	  passed to pci_set_region().
372*2d934e57SSimon Glass
373dd84058dSMasahiro Yamadaendmenu
374