common/spl/Kconfig

   1 menu "SPL / TPL"
   2
   3 config SUPPORT_SPL
   4         bool
   5
   6 config SUPPORT_TPL
   7         bool
   8
   9 config SPL
  10         bool
  11         depends on SUPPORT_SPL
  12         prompt "Enable SPL"
  13         help
  14           If you want to build SPL as well as the normal image, say Y.
  15
  16 config SPL_SYS_MALLOC_SIMPLE
  17         bool
  18         depends on SPL
  19         prompt "Only use malloc_simple functions in the SPL"
  20         help
  21           Say Y here to only use the *_simple malloc functions from
  22           malloc_simple.c, rather then using the versions from dlmalloc.c;
  23           this will make the SPL binary smaller at the cost of more heap
  24           usage as the *_simple malloc functions do not re-use free-ed mem.
  25
  26 config SPL_STACK_R
  27         depends on SPL
  28         bool "Enable SDRAM location for SPL stack"
  29         help
  30           SPL starts off execution in SRAM and thus typically has only a small
  31           stack available. Since SPL sets up DRAM while in its board_init_f()
  32           function, it is possible for the stack to move there before
  33           board_init_r() is reached. This option enables a special SDRAM
  34           location for the SPL stack. U-Boot SPL switches to this after
  35           board_init_f() completes, and before board_init_r() starts.
  36
  37 config SPL_STACK_R_ADDR
  38         depends on SPL_STACK_R
  39         hex "SDRAM location for SPL stack"
  40         help
  41           Specify the address in SDRAM for the SPL stack. This will be set up
  42           before board_init_r() is called.
  43
  44 config SPL_STACK_R_MALLOC_SIMPLE_LEN
  45         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
  46         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
  47         default 0x100000
  48         help
  49           Specify the amount of the stack to use as memory pool for
  50           malloc_simple after switching the stack to DRAM. This may be set
  51           to give board_init_r() a larger heap then the initial heap in
  52           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
  53
  54 config SPL_SEPARATE_BSS
  55         depends on SPL
  56         bool "BSS section is in a different memory region from text"
  57         help
  58           Some platforms need a large BSS region in SPL and can provide this
  59           because RAM is already set up. In this case BSS can be moved to RAM.
  60           This option should then be enabled so that the correct device tree
  61           location is used. Normally we put the device tree at the end of BSS
  62           but with this option enabled, it goes at _image_binary_end.
  63
  64 config SPL_DISPLAY_PRINT
  65         depends on SPL
  66         bool "Display a board-specific message in SPL"
  67         help
  68           If this option is enabled, U-Boot will call the function
  69           spl_display_print() immediately after displaying the SPL console
  70           banner ("U-Boot SPL ..."). This function should be provided by
  71           the board.
  72
  73 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
  74         bool "MMC raw mode: by sector"
  75         depends on SPL
  76         default y if ARCH_SUNXI || ARCH_DAVINCI || ARCH_UNIPHIER ||ARCH_MX6 || \
  77                      ARCH_ROCKCHIP || ARCH_MVEBU ||  ARCH_SOCFPGA || \
  78                      ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
  79                      OMAP44XX || OMAP54XX || AM33XX || AM43XX
  80         help
  81           Use sector number for specifying U-Boot location on MMC/SD in
  82           raw mode.
  83
  84 config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
  85         hex "Address on the MMC to load U-Boot from"
  86         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
  87         default 0x50 if ARCH_SUNXI
  88         default 0x75 if ARCH_DAVINCI
  89         default 0x8a if ARCH_MX6
  90         default 0x100 if ARCH_ROCKCHIP || ARCH_UNIPHIER
  91         default 0x140 if ARCH_MVEBU
  92         default 0x200 if ARCH_SOCFPGA || ARCH_AT91
  93         default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
  94                          OMAP54XX || AM33XX || AM43XX
  95         help
  96           Address on the MMC to load U-Boot from, when the MMC is being used
  97           in raw mode. Units: MMC sectors (1 sector = 512 bytes).
  98
  99 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 100         bool "MMC Raw mode: by partition"
 101         depends on SPL
 102         help
 103           Use a partition for loading U-Boot when using MMC/SD in raw mode.
 104
 105 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
 106         hex "Partition to use to load U-Boot from"
 107         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 108         default 1
 109         help
 110           Partition on the MMC to load U-Boot from when the MMC is being
 111           used in raw mode
 112
 113 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 114         bool "MMC raw mode: by partition type"
 115         depends on SPL && DOS_PARTITION && \
 116                 SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 117         help
 118           Use partition type for specifying U-Boot partition on MMC/SD in
 119           raw mode. U-Boot will be loaded from the first partition of this
 120           type to be found.
 121
 122 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
 123         hex "Partition Type on the MMC to load U-Boot from"
 124         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 125         help
 126           Partition Type on the MMC to load U-Boot from, when the MMC is being
 127           used in raw mode.
 128
 129 config TPL
 130         bool
 131         depends on SPL && SUPPORT_TPL
 132         prompt "Enable TPL"
 133         help
 134           If you want to build TPL as well as the normal image and SPL, say Y.
 135
 136 config SPL_CRC32_SUPPORT
 137         bool "Support CRC32"
 138         depends on SPL_FIT
 139         help
 140           Enable this to support CRC32 in FIT images within SPL. This is a
 141           32-bit checksum value that can be used to verify images. This is
 142           the least secure type of checksum, suitable for detected
 143           accidental image corruption. For secure applications you should
 144           consider SHA1 or SHA256.
 145
 146 config SPL_MD5_SUPPORT
 147         bool "Support MD5"
 148         depends on SPL_FIT
 149         help
 150           Enable this to support MD5 in FIT images within SPL. An MD5
 151           checksum is a 128-bit hash value used to check that the image
 152           contents have not been corrupted. Note that MD5 is not considered
 153           secure as it is possible (with a brute-force attack) to adjust the
 154           image while still retaining the same MD5 hash value. For secure
 155           applications where images may be changed maliciously, you should
 156           consider SHA1 or SHA256.
 157
 158 config SPL_SHA1_SUPPORT
 159         bool "Support SHA1"
 160         depends on SPL_FIT
 161         help
 162           Enable this to support SHA1 in FIT images within SPL. A SHA1
 163           checksum is a 160-bit (20-byte) hash value used to check that the
 164           image contents have not been corrupted or maliciously altered.
 165           While SHA1 is fairly secure it is coming to the end of its life
 166           due to the expanding computing power avaiable to brute-force
 167           attacks. For more security, consider SHA256.
 168
 169 config SPL_SHA256_SUPPORT
 170         bool "Support SHA256"
 171         depends on SPL_FIT
 172         help
 173           Enable this to support SHA256 in FIT images within SPL. A SHA256
 174           checksum is a 256-bit (32-byte) hash value used to check that the
 175           image contents have not been corrupted. SHA256 is recommended for
 176           use in secure applications since (as at 2016) there is no known
 177           feasible attack that could produce a 'collision' with differing
 178           input data. Use this for the highest security. Note that only the
 179           SHA256 variant is supported: SHA512 and others are not currently
 180           supported in U-Boot.
 181
 182 config SPL_CPU_SUPPORT
 183         bool "Support CPU drivers"
 184         depends on SPL
 185         help
 186           Enable this to support CPU drivers in SPL. These drivers can set
 187           up CPUs and provide information about them such as the model and
 188           name. This can be useful in SPL since setting up the CPUs earlier
 189           may improve boot performance. Enable this option to build the
 190           drivers in drivers/cpu as part of an SPL build.
 191
 192 config SPL_CRYPTO_SUPPORT
 193         bool "Support crypto drivers"
 194         depends on SPL
 195         help
 196           Enable crypto drivers in SPL. These drivers can be used to
 197           accelerate secure boot processing in secure applications. Enable
 198           this option to build the drivers in drivers/crypto as part of an
 199           SPL build.
 200
 201 config SPL_HASH_SUPPORT
 202         bool "Support hashing drivers"
 203         depends on SPL
 204         help
 205           Enable hashing drivers in SPL. These drivers can be used to
 206           accelerate secure boot processing in secure applications. Enable
 207           this option to build system-specific drivers for hash acceleration
 208           as part of an SPL build.
 209
 210 config SPL_DMA_SUPPORT
 211         bool "Support DMA drivers"
 212         depends on SPL
 213         help
 214           Enable DMA (direct-memory-access) drivers in SPL. These drivers
 215           can be used to handle memory-to-peripheral data transfer without
 216           the CPU moving the data. Enable this option to build the drivers
 217           in drivers/dma as part of an SPL build.
 218
 219 config SPL_DRIVERS_MISC_SUPPORT
 220         bool "Support misc drivers"
 221         depends on SPL
 222         help
 223           Enable miscellaneous drivers in SPL. These drivers perform various
 224           tasks that don't fall nicely into other categories, Enable this
 225           option to build the drivers in drivers/misc as part of an SPL
 226           build, for those that support building in SPL (not all drivers do).
 227
 228 config SPL_ENV_SUPPORT
 229         bool "Support an environment"
 230         depends on SPL
 231         help
 232           Enable environment support in SPL. The U-Boot environment provides
 233           a number of settings (essentially name/value pairs) which can
 234           control many aspects of U-Boot's operation. Normally this is not
 235           needed in SPL as it has a much simpler task with less
 236           configuration. But some boards use this to support 'Falcon' boot
 237           on EXT2 and FAT, where SPL boots directly into Linux without
 238           starting U-Boot first. Enabling this option will make getenv()
 239           and setenv() available in SPL.
 240
 241 config SPL_SAVEENV
 242         bool "Support save environment"
 243         depends on SPL && SPL_ENV_SUPPORT
 244         help
 245           Enable save environment support in SPL after setenv. By default
 246           the saveenv option is not provided in SPL, but some boards need
 247           this support in 'Falcon' boot, where SPL need to boot from
 248           different images based on environment variable set by OS. For
 249           example OS may set "reboot_image" environment variable to
 250           "recovery" inorder to boot recovery image by SPL. The SPL read
 251           "reboot_image" and act accordingly and change the reboot_image
 252           to default mode using setenv and save the environemnt.
 253
 254 config SPL_ETH_SUPPORT
 255         bool "Support Ethernet"
 256         depends on SPL_ENV_SUPPORT
 257         help
 258           Enable access to the network subsystem and associated Ethernet
 259           drivers in SPL. This permits SPL to load U-Boot over an Ethernet
 260           link rather than from an on-board peripheral. Environment support
 261           is required since the network stack uses a number of environment
 262           variables. See also SPL_NET_SUPPORT.
 263
 264 config SPL_EXT_SUPPORT
 265         bool "Support EXT filesystems"
 266         depends on SPL
 267         help
 268           Enable support for EXT2/3/4 filesystems with SPL. This permits
 269           U-Boot (or Linux in Falcon mode) to be loaded from an EXT
 270           filesystem from within SPL. Support for the underlying block
 271           device (e.g. MMC or USB) must be enabled separately.
 272
 273 config SPL_FAT_SUPPORT
 274         bool "Support FAT filesystems"
 275         depends on SPL
 276         help
 277           Enable support for FAT and VFAT filesystems with SPL. This
 278           permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
 279           filesystem from within SPL. Support for the underlying block
 280           device (e.g. MMC or USB) must be enabled separately.
 281
 282 config SPL_FPGA_SUPPORT
 283         bool "Support FPGAs"
 284         depends on SPL
 285         help
 286           Enable support for FPGAs in SPL. Field-programmable Gate Arrays
 287           provide software-configurable hardware which is typically used to
 288           implement peripherals (such as UARTs, LCD displays, MMC) or
 289           accelerate custom processing functions, such as image processing
 290           or machine learning. Sometimes it is useful to program the FPGA
 291           as early as possible during boot, and this option can enable that
 292           within SPL.
 293
 294 config SPL_GPIO_SUPPORT
 295         bool "Support GPIO"
 296         depends on SPL
 297         help
 298           Enable support for GPIOs (General-purpose Input/Output) in SPL.
 299           GPIOs allow U-Boot to read the state of an input line (high or
 300           low) and set the state of an output line. This can be used to
 301           drive LEDs, control power to various system parts and read user
 302           input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
 303           for example. Enable this option to build the drivers in
 304           drivers/gpio as part of an SPL build.
 305
 306 config SPL_I2C_SUPPORT
 307         bool "Support I2C"
 308         depends on SPL
 309         help
 310           Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
 311           I2C works with a clock and data line which can be driven by a
 312           one or more masters or slaves. It is a fairly complex bus but is
 313           widely used as it only needs two lines for communication. Speeds of
 314           400kbps are typical but up to 3.4Mbps is supported by some
 315           hardware. I2C can be useful in SPL to configure power management
 316           ICs (PMICs) before raising the CPU clock speed, for example.
 317           Enable this option to build the drivers in drivers/i2c as part of
 318           an SPL build.
 319
 320 config SPL_LIBCOMMON_SUPPORT
 321         bool "Support common libraries"
 322         depends on SPL
 323         help
 324           Enable support for common U-Boot libraries within SPL. These
 325           libraries include common code to deal with U-Boot images,
 326           environment and USB, for example. This option is enabled on many
 327           boards. Enable this option to build the code in common/ as part of
 328           an SPL build.
 329
 330 config SPL_LIBDISK_SUPPORT
 331         bool "Support disk paritions"
 332         depends on SPL
 333         help
 334           Enable support for disk partitions within SPL. 'Disk' is something
 335           of a misnomer as it includes non-spinning media such as flash (as
 336           used in MMC and USB sticks). Partitions provide a way for a disk
 337           to be split up into separate regions, with a partition table placed
 338           at the start or end which describes the location and size of each
 339           'partition'. These partitions are typically uses as individual block
 340           devices, typically with an EXT2 or FAT filesystem in each. This
 341           option enables whatever partition support has been enabled in
 342           U-Boot to also be used in SPL. It brings in the code in disk/.
 343
 344 config SPL_LIBGENERIC_SUPPORT
 345         bool "Support generic libraries"
 346         depends on SPL
 347         help
 348           Enable support for generic U-Boot libraries within SPL. These
 349           libraries include generic code to deal with device tree, hashing,
 350           printf(), compression and the like. This option is enabled on many
 351           boards. Enable this option to build the code in lib/ as part of an
 352           SPL build.
 353
 354 config SPL_MMC_SUPPORT
 355         bool "Support MMC"
 356         depends on SPL
 357         help
 358           Enable support for MMC (Multimedia Card) within SPL. This enables
 359           the MMC protocol implementation and allows any enabled drivers to
 360           be used within SPL. MMC can be used with or without disk partition
 361           support depending on the application (SPL_LIBDISK_SUPPORT). Enable
 362           this option to build the drivers in drivers/mmc as part of an SPL
 363           build.
 364
 365 config SPL_MPC8XXX_INIT_DDR_SUPPORT
 366         bool "Support MPC8XXX DDR init"
 367         depends on SPL
 368         help
 369           Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
 370           random-access memory) on the MPC8XXX family within SPL. This
 371           allows DRAM to be set up before loading U-Boot into that DRAM,
 372           where it can run.
 373
 374 config SPL_MTD_SUPPORT
 375         bool "Support MTD drivers"
 376         depends on SPL
 377         help
 378           Enable support for MTD (Memory Technology Device) within SPL. MTD
 379           provides a block interface over raw NAND and can also be used with
 380           SPI flash. This allows SPL to load U-Boot from supported MTD
 381           devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
 382           to enable specific MTD drivers.
 383
 384 config SPL_MUSB_NEW_SUPPORT
 385         bool "Support new Mentor Graphics USB"
 386         depends on SPL
 387         help
 388           Enable support for Mentor Graphics USB in SPL. This is a new
 389           driver used by some boards. Enable this option to build
 390           the drivers in drivers/usb/musb-new as part of an SPL build. The
 391           old drivers are in drivers/usb/musb.
 392
 393 config SPL_NAND_SUPPORT
 394         bool "Support NAND flash"
 395         depends on SPL
 396         help
 397           Enable support for NAND (Negative AND) flash in SPL. NAND flash
 398           can be used to allow SPL to load U-Boot from supported devices.
 399           This enables the drivers in drivers/mtd/nand as part of an SPL
 400           build.
 401
 402 config SPL_NET_SUPPORT
 403         bool "Support networking"
 404         depends on SPL
 405         help
 406           Enable support for network devices (such as Ethernet) in SPL.
 407           This permits SPL to load U-Boot over a network link rather than
 408           from an on-board peripheral. Environment support is required since
 409           the network stack uses a number of environment variables. See also
 410           SPL_ETH_SUPPORT.
 411
 412 if SPL_NET_SUPPORT
 413 config SPL_NET_VCI_STRING
 414         string "BOOTP Vendor Class Identifier string sent by SPL"
 415         help
 416           As defined by RFC 2132 the vendor class identifier field can be
 417           sent by the client to identify the vendor type and configuration
 418           of a client.  This is often used in practice to allow for the DHCP
 419           server to specify different files to load depending on if the ROM,
 420           SPL or U-Boot itself makes the request
 421 endif   # if SPL_NET_SUPPORT
 422
 423 config SPL_NO_CPU_SUPPORT
 424         bool "Drop CPU code in SPL"
 425         depends on SPL
 426         help
 427           This is specific to the ARM926EJ-S CPU. It disables the standard
 428           start.S start-up code, presumably so that a replacement can be
 429           used on that CPU. You should not enable it unless you know what
 430           you are doing.
 431
 432 config SPL_NOR_SUPPORT
 433         bool "Support NOR flash"
 434         depends on SPL
 435         help
 436           Enable support for loading U-Boot from memory-mapped NOR (Negative
 437           OR) flash in SPL. NOR flash is slow to write but fast to read, and
 438           a memory-mapped device makes it very easy to access. Loading from
 439           NOR is typically achieved with just a memcpy().
 440
 441 config SPL_ONENAND_SUPPORT
 442         bool "Support OneNAND flash"
 443         depends on SPL
 444         help
 445           Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
 446           a type of NAND flash and therefore can be used to allow SPL to
 447           load U-Boot from supported devices. This enables the drivers in
 448           drivers/mtd/onenand as part of an SPL build.
 449
 450 config SPL_OS_BOOT
 451         bool "Activate Falcon Mode"
 452         depends on SPL && !TI_SECURE_DEVICE
 453         default n
 454         help
 455           Enable booting directly to an OS from SPL.
 456           for more info read doc/README.falcon
 457
 458 if SPL_OS_BOOT
 459 config SYS_OS_BASE
 460         hex "addr, where OS is found"
 461         depends on SPL && SPL_NOR_SUPPORT
 462         help
 463           Specify the address, where the OS image is found, which
 464           gets booted.
 465
 466 endif # SPL_OS_BOOT
 467
 468 config SPL_PCI_SUPPORT
 469         bool "Support PCI drivers"
 470         depends on SPL
 471         help
 472           Enable support for PCI in SPL. For platforms that need PCI to boot,
 473           or must perform some init using PCI in SPL, this provides the
 474           necessary driver support. This enables the drivers in drivers/pci
 475           as part of an SPL build.
 476
 477 config SPL_PCH_SUPPORT
 478         bool "Support PCH drivers"
 479         depends on SPL
 480         help
 481           Enable support for PCH (Platform Controller Hub) devices in SPL.
 482           These are used to set up GPIOs and the SPI peripheral early in
 483           boot. This enables the drivers in drivers/pch as part of an SPL
 484           build.
 485
 486 config SPL_POST_MEM_SUPPORT
 487         bool "Support POST drivers"
 488         depends on SPL
 489         help
 490           Enable support for POST (Power-on Self Test) in SPL. POST is a
 491           procedure that checks that the hardware (CPU or board) appears to
 492           be functionally correctly. It is a sanity check that can be
 493           performed before booting. This enables the drivers in post/drivers
 494           as part of an SPL build.
 495
 496 config SPL_POWER_SUPPORT
 497         bool "Support power drivers"
 498         depends on SPL
 499         help
 500           Enable support for power control in SPL. This includes support
 501           for PMICs (Power-management Integrated Circuits) and some of the
 502           features provided by PMICs. In particular, voltage regulators can
 503           be used to enable/disable power and vary its voltage. That can be
 504           useful in SPL to turn on boot peripherals and adjust CPU voltage
 505           so that the clock speed can be increased. This enables the drivers
 506           in drivers/power, drivers/power/pmic and drivers/power/regulator
 507           as part of an SPL build.
 508
 509 config SPL_RAM_SUPPORT
 510         bool "Support booting from RAM"
 511         depends on SPL
 512         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 513         help
 514           Enable booting of an image in RAM. The image can be preloaded or
 515           it can be loaded by SPL directly into RAM (e.g. using USB).
 516
 517 config SPL_RAM_DEVICE
 518         bool "Support booting from preloaded image in RAM"
 519         depends on SPL_RAM_SUPPORT
 520         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 521         help
 522           Enable booting of an image already loaded in RAM. The image has to
 523           be already in memory when SPL takes over, e.g. loaded by the boot
 524           ROM.
 525
 526 config SPL_RTC_SUPPORT
 527         bool "Support RTC drivers"
 528         depends on SPL
 529         help
 530           Enable RTC (Real-time Clock) support in SPL. This includes support
 531           for reading and setting the time. Some RTC devices also have some
 532           non-volatile (battery-backed) memory which is accessible if
 533           needed. This enables the drivers in drivers/rtc as part of an SPL
 534           build.
 535
 536 config SPL_SATA_SUPPORT
 537         bool "Support loading from SATA"
 538         depends on SPL
 539         help
 540           Enable support for SATA (Serial AT attachment) in SPL. This allows
 541           use of SATA devices such as hard drives and flash drivers for
 542           loading U-Boot. SATA is used in higher-end embedded systems and
 543           can provide higher performance than MMC , at somewhat higher
 544           expense and power consumption. This enables loading from SATA
 545           using a configured device.
 546
 547 config SPL_SERIAL_SUPPORT
 548         bool "Support serial"
 549         depends on SPL
 550         help
 551           Enable support for serial in SPL. This allows use of a serial UART
 552           for displaying messages while SPL is running. It also brings in
 553           printf() and panic() functions. This should normally be enabled
 554           unless there are space reasons not to. Even then, consider
 555           enabling USE_TINY_PRINTF which is a small printf() version.
 556
 557 config SPL_SPI_FLASH_SUPPORT
 558         bool "Support SPI flash drivers"
 559         depends on SPL
 560         help
 561           Enable support for using SPI flash in SPL, and loading U-Boot from
 562           SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
 563           the SPI bus that is used to connect it to a system. It is a simple
 564           but fast bidirectional 4-wire bus (clock, chip select and two data
 565           lines). This enables the drivers in drivers/mtd/spi as part of an
 566           SPL build. This normally requires SPL_SPI_SUPPORT.
 567
 568 config SPL_SPI_SUPPORT
 569         bool "Support SPI drivers"
 570         depends on SPL
 571         help
 572           Enable support for using SPI in SPL. This is used for connecting
 573           to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
 574           more details on that. The SPI driver provides the transport for
 575           data between the SPI flash and the CPU. This option can be used to
 576           enable SPI drivers that are needed for other purposes also, such
 577           as a SPI PMIC.
 578
 579 config SPL_TIMER_SUPPORT
 580         bool "Support timer drivers"
 581         depends on SPL
 582         help
 583           Enable support for timer drivers in SPL. These can be used to get
 584           a timer value when in SPL, or perhaps for implementing a delay
 585           function. This enables the drivers in drivers/timer as part of an
 586           SPL build.
 587
 588 config SPL_USB_HOST_SUPPORT
 589         bool "Support USB host drivers"
 590         depends on SPL
 591         help
 592           Enable access to USB (Universal Serial Bus) host devices so that
 593           SPL can load U-Boot from a connected USB peripheral, such as a USB
 594           flash stick. While USB takes a little longer to start up than most
 595           buses, it is very flexible since many different types of storage
 596           device can be attached. This option enables the drivers in
 597           drivers/usb/host as part of an SPL build.
 598
 599 config SPL_USB_SUPPORT
 600         bool "Support loading from USB"
 601         depends on SPL_USB_HOST_SUPPORT
 602         help
 603           Enable support for USB devices in SPL. This allows use of USB
 604           devices such as hard drives and flash drivers for loading U-Boot.
 605           The actual drivers are enabled separately using the normal U-Boot
 606           config options. This enables loading from USB using a configured
 607           device.
 608
 609 config SPL_USB_GADGET_SUPPORT
 610         bool "Suppport USB Gadget drivers"
 611         depends on SPL
 612         help
 613           Enable USB Gadget API which allows to enable USB device functions
 614           in SPL.
 615
 616 if SPL_USB_GADGET_SUPPORT
 617
 618 config SPL_USBETH_SUPPORT
 619         bool "Support USB Ethernet drivers"
 620         help
 621           Enable access to the USB network subsystem and associated
 622           drivers in SPL. This permits SPL to load U-Boot over a
 623           USB-connected Ethernet link (such as a USB Ethernet dongle) rather
 624           than from an onboard peripheral. Environment support is required
 625           since the network stack uses a number of environment variables.
 626           See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
 627
 628 config SPL_DFU_SUPPORT
 629         bool "Support DFU (Device Firmware Upgarde)"
 630         select SPL_HASH_SUPPORT
 631         help
 632           This feature enables the DFU (Device Firmware Upgarde) in SPL with
 633           RAM memory device support. The ROM code will load and execute
 634           the SPL built with dfu. The user can load binaries (u-boot/kernel) to
 635           selected device partition from host-pc using dfu-utils.
 636           This feature is useful to flash the binaries to factory or bare-metal
 637           boards using USB interface.
 638
 639 choice
 640         bool "DFU device selection"
 641         depends on SPL_DFU_SUPPORT
 642
 643 config SPL_DFU_RAM
 644         bool "RAM device"
 645         depends on SPL_DFU_SUPPORT && SPL_RAM_SUPPORT
 646         help
 647          select RAM/DDR memory device for loading binary images
 648          (u-boot/kernel) to the selected device partition using
 649          DFU and execute the u-boot/kernel from RAM.
 650
 651 endchoice
 652
 653 endif
 654
 655 config SPL_WATCHDOG_SUPPORT
 656         bool "Support watchdog drivers"
 657         depends on SPL
 658         help
 659           Enable support for watchdog drivers in SPL. A watchdog is
 660           typically a hardware peripheral which can reset the system when it
 661           detects no activity for a while (such as a software crash). This
 662           enables the drivers in drivers/watchdog as part of an SPL build.
 663
 664 config SPL_YMODEM_SUPPORT
 665         bool "Support loading using Ymodem"
 666         depends on SPL
 667         help
 668           While loading from serial is slow it can be a useful backup when
 669           there is no other option. The Ymodem protocol provides a reliable
 670           means of transmitting U-Boot over a serial line for using in SPL,
 671           with a checksum to ensure correctness.
 672
 673 config TPL_ENV_SUPPORT
 674         bool "Support an environment"
 675         depends on TPL
 676         help
 677           Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
 678
 679 config TPL_I2C_SUPPORT
 680         bool "Support I2C"
 681         depends on TPL
 682         help
 683           Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
 684           details.
 685
 686 config TPL_LIBCOMMON_SUPPORT
 687         bool "Support common libraries"
 688         depends on TPL
 689         help
 690           Enable support for common U-Boot libraries within TPL. See
 691           SPL_LIBCOMMON_SUPPORT for details.
 692
 693 config TPL_LIBGENERIC_SUPPORT
 694         bool "Support generic libraries"
 695         depends on TPL
 696         help
 697           Enable support for generic U-Boot libraries within TPL. See
 698           SPL_LIBGENERIC_SUPPORT for details.
 699
 700 config TPL_MPC8XXX_INIT_DDR_SUPPORT
 701         bool "Support MPC8XXX DDR init"
 702         depends on TPL
 703         help
 704           Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
 705           SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
 706
 707 config TPL_MMC_SUPPORT
 708         bool "Support MMC"
 709         depends on TPL
 710         help
 711           Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
 712
 713 config TPL_NAND_SUPPORT
 714         bool "Support NAND flash"
 715         depends on TPL
 716         help
 717           Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
 718
 719 config TPL_SERIAL_SUPPORT
 720         bool "Support serial"
 721         depends on TPL
 722         help
 723           Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
 724           details.
 725
 726 config TPL_SPI_FLASH_SUPPORT
 727         bool "Support SPI flash drivers"
 728         depends on TPL
 729         help
 730           Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
 731           for details.
 732
 733 config TPL_SPI_SUPPORT
 734         bool "Support SPI drivers"
 735         depends on TPL
 736         help
 737           Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for
 738           details.
 739
 740 endmenu