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_DFU_NO_RESET
  10         bool
  11
  12 config SPL
  13         bool
  14         depends on SUPPORT_SPL
  15         prompt "Enable SPL"
  16         help
  17           If you want to build SPL as well as the normal image, say Y.
  18
  19 config SPL_RAW_IMAGE_SUPPORT
  20         bool "Support SPL loading and booting of RAW images"
  21         depends on SPL
  22         default n if (ARCH_MX6 && (SPL_MMC_SUPPORT || SPL_SATA_SUPPORT))
  23         default y if !TI_SECURE_DEVICE
  24         help
  25           SPL will support loading and booting a RAW image when this option
  26           is y. If this is not set, SPL will move on to other available
  27           boot media to find a suitable image.
  28
  29 config SPL_LEGACY_IMAGE_SUPPORT
  30         bool "Support SPL loading and booting of Legacy images"
  31         default y if !TI_SECURE_DEVICE
  32         help
  33           SPL will support loading and booting Legacy images when this option
  34           is y. If this is not set, SPL will move on to other available
  35           boot media to find a suitable image.
  36
  37 config SPL_SYS_MALLOC_SIMPLE
  38         bool
  39         depends on SPL
  40         prompt "Only use malloc_simple functions in the SPL"
  41         help
  42           Say Y here to only use the *_simple malloc functions from
  43           malloc_simple.c, rather then using the versions from dlmalloc.c;
  44           this will make the SPL binary smaller at the cost of more heap
  45           usage as the *_simple malloc functions do not re-use free-ed mem.
  46
  47 config SPL_STACK_R
  48         depends on SPL
  49         bool "Enable SDRAM location for SPL stack"
  50         help
  51           SPL starts off execution in SRAM and thus typically has only a small
  52           stack available. Since SPL sets up DRAM while in its board_init_f()
  53           function, it is possible for the stack to move there before
  54           board_init_r() is reached. This option enables a special SDRAM
  55           location for the SPL stack. U-Boot SPL switches to this after
  56           board_init_f() completes, and before board_init_r() starts.
  57
  58 config SPL_STACK_R_ADDR
  59         depends on SPL_STACK_R
  60         hex "SDRAM location for SPL stack"
  61         help
  62           Specify the address in SDRAM for the SPL stack. This will be set up
  63           before board_init_r() is called.
  64
  65 config SPL_STACK_R_MALLOC_SIMPLE_LEN
  66         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
  67         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
  68         default 0x100000
  69         help
  70           Specify the amount of the stack to use as memory pool for
  71           malloc_simple after switching the stack to DRAM. This may be set
  72           to give board_init_r() a larger heap then the initial heap in
  73           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
  74
  75 config SPL_SEPARATE_BSS
  76         depends on SPL
  77         bool "BSS section is in a different memory region from text"
  78         help
  79           Some platforms need a large BSS region in SPL and can provide this
  80           because RAM is already set up. In this case BSS can be moved to RAM.
  81           This option should then be enabled so that the correct device tree
  82           location is used. Normally we put the device tree at the end of BSS
  83           but with this option enabled, it goes at _image_binary_end.
  84
  85 config SPL_DISPLAY_PRINT
  86         depends on SPL
  87         bool "Display a board-specific message in SPL"
  88         help
  89           If this option is enabled, U-Boot will call the function
  90           spl_display_print() immediately after displaying the SPL console
  91           banner ("U-Boot SPL ..."). This function should be provided by
  92           the board.
  93
  94 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
  95         bool "MMC raw mode: by sector"
  96         depends on SPL
  97         default y if ARCH_SUNXI || ARCH_DAVINCI || ARCH_UNIPHIER ||ARCH_MX6 || \
  98                      ARCH_ROCKCHIP || ARCH_MVEBU ||  ARCH_SOCFPGA || \
  99                      ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
 100                      OMAP44XX || OMAP54XX || AM33XX || AM43XX
 101         help
 102           Use sector number for specifying U-Boot location on MMC/SD in
 103           raw mode.
 104
 105 config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
 106         hex "Address on the MMC to load U-Boot from"
 107         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
 108         default 0x50 if ARCH_SUNXI
 109         default 0x75 if ARCH_DAVINCI
 110         default 0x8a if ARCH_MX6
 111         default 0x100 if ARCH_ROCKCHIP || ARCH_UNIPHIER
 112         default 0x140 if ARCH_MVEBU
 113         default 0x200 if ARCH_SOCFPGA || ARCH_AT91
 114         default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
 115                          OMAP54XX || AM33XX || AM43XX
 116         help
 117           Address on the MMC to load U-Boot from, when the MMC is being used
 118           in raw mode. Units: MMC sectors (1 sector = 512 bytes).
 119
 120 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 121         bool "MMC Raw mode: by partition"
 122         depends on SPL
 123         help
 124           Use a partition for loading U-Boot when using MMC/SD in raw mode.
 125
 126 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
 127         hex "Partition to use to load U-Boot from"
 128         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 129         default 1
 130         help
 131           Partition on the MMC to load U-Boot from when the MMC is being
 132           used in raw mode
 133
 134 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 135         bool "MMC raw mode: by partition type"
 136         depends on SPL && DOS_PARTITION && \
 137                 SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 138         help
 139           Use partition type for specifying U-Boot partition on MMC/SD in
 140           raw mode. U-Boot will be loaded from the first partition of this
 141           type to be found.
 142
 143 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
 144         hex "Partition Type on the MMC to load U-Boot from"
 145         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 146         help
 147           Partition Type on the MMC to load U-Boot from, when the MMC is being
 148           used in raw mode.
 149
 150 config TPL
 151         bool
 152         depends on SPL && SUPPORT_TPL
 153         prompt "Enable TPL"
 154         help
 155           If you want to build TPL as well as the normal image and SPL, say Y.
 156
 157 config SPL_CRC32_SUPPORT
 158         bool "Support CRC32"
 159         depends on SPL_FIT
 160         help
 161           Enable this to support CRC32 in FIT images within SPL. This is a
 162           32-bit checksum value that can be used to verify images. This is
 163           the least secure type of checksum, suitable for detected
 164           accidental image corruption. For secure applications you should
 165           consider SHA1 or SHA256.
 166
 167 config SPL_MD5_SUPPORT
 168         bool "Support MD5"
 169         depends on SPL_FIT
 170         help
 171           Enable this to support MD5 in FIT images within SPL. An MD5
 172           checksum is a 128-bit hash value used to check that the image
 173           contents have not been corrupted. Note that MD5 is not considered
 174           secure as it is possible (with a brute-force attack) to adjust the
 175           image while still retaining the same MD5 hash value. For secure
 176           applications where images may be changed maliciously, you should
 177           consider SHA1 or SHA256.
 178
 179 config SPL_SHA1_SUPPORT
 180         bool "Support SHA1"
 181         depends on SPL_FIT
 182         help
 183           Enable this to support SHA1 in FIT images within SPL. A SHA1
 184           checksum is a 160-bit (20-byte) hash value used to check that the
 185           image contents have not been corrupted or maliciously altered.
 186           While SHA1 is fairly secure it is coming to the end of its life
 187           due to the expanding computing power avaiable to brute-force
 188           attacks. For more security, consider SHA256.
 189
 190 config SPL_SHA256_SUPPORT
 191         bool "Support SHA256"
 192         depends on SPL_FIT
 193         help
 194           Enable this to support SHA256 in FIT images within SPL. A SHA256
 195           checksum is a 256-bit (32-byte) hash value used to check that the
 196           image contents have not been corrupted. SHA256 is recommended for
 197           use in secure applications since (as at 2016) there is no known
 198           feasible attack that could produce a 'collision' with differing
 199           input data. Use this for the highest security. Note that only the
 200           SHA256 variant is supported: SHA512 and others are not currently
 201           supported in U-Boot.
 202
 203 config SPL_CPU_SUPPORT
 204         bool "Support CPU drivers"
 205         depends on SPL
 206         help
 207           Enable this to support CPU drivers in SPL. These drivers can set
 208           up CPUs and provide information about them such as the model and
 209           name. This can be useful in SPL since setting up the CPUs earlier
 210           may improve boot performance. Enable this option to build the
 211           drivers in drivers/cpu as part of an SPL build.
 212
 213 config SPL_CRYPTO_SUPPORT
 214         bool "Support crypto drivers"
 215         depends on SPL
 216         help
 217           Enable crypto drivers in SPL. These drivers can be used to
 218           accelerate secure boot processing in secure applications. Enable
 219           this option to build the drivers in drivers/crypto as part of an
 220           SPL build.
 221
 222 config SPL_HASH_SUPPORT
 223         bool "Support hashing drivers"
 224         depends on SPL
 225         help
 226           Enable hashing drivers in SPL. These drivers can be used to
 227           accelerate secure boot processing in secure applications. Enable
 228           this option to build system-specific drivers for hash acceleration
 229           as part of an SPL build.
 230
 231 config SPL_DMA_SUPPORT
 232         bool "Support DMA drivers"
 233         depends on SPL
 234         help
 235           Enable DMA (direct-memory-access) drivers in SPL. These drivers
 236           can be used to handle memory-to-peripheral data transfer without
 237           the CPU moving the data. Enable this option to build the drivers
 238           in drivers/dma as part of an SPL build.
 239
 240 config SPL_DRIVERS_MISC_SUPPORT
 241         bool "Support misc drivers"
 242         depends on SPL
 243         help
 244           Enable miscellaneous drivers in SPL. These drivers perform various
 245           tasks that don't fall nicely into other categories, Enable this
 246           option to build the drivers in drivers/misc as part of an SPL
 247           build, for those that support building in SPL (not all drivers do).
 248
 249 config SPL_ENV_SUPPORT
 250         bool "Support an environment"
 251         depends on SPL
 252         help
 253           Enable environment support in SPL. The U-Boot environment provides
 254           a number of settings (essentially name/value pairs) which can
 255           control many aspects of U-Boot's operation. Normally this is not
 256           needed in SPL as it has a much simpler task with less
 257           configuration. But some boards use this to support 'Falcon' boot
 258           on EXT2 and FAT, where SPL boots directly into Linux without
 259           starting U-Boot first. Enabling this option will make getenv()
 260           and setenv() available in SPL.
 261
 262 config SPL_SAVEENV
 263         bool "Support save environment"
 264         depends on SPL && SPL_ENV_SUPPORT
 265         help
 266           Enable save environment support in SPL after setenv. By default
 267           the saveenv option is not provided in SPL, but some boards need
 268           this support in 'Falcon' boot, where SPL need to boot from
 269           different images based on environment variable set by OS. For
 270           example OS may set "reboot_image" environment variable to
 271           "recovery" inorder to boot recovery image by SPL. The SPL read
 272           "reboot_image" and act accordingly and change the reboot_image
 273           to default mode using setenv and save the environemnt.
 274
 275 config SPL_ETH_SUPPORT
 276         bool "Support Ethernet"
 277         depends on SPL_ENV_SUPPORT
 278         help
 279           Enable access to the network subsystem and associated Ethernet
 280           drivers in SPL. This permits SPL to load U-Boot over an Ethernet
 281           link rather than from an on-board peripheral. Environment support
 282           is required since the network stack uses a number of environment
 283           variables. See also SPL_NET_SUPPORT.
 284
 285 config SPL_EXT_SUPPORT
 286         bool "Support EXT filesystems"
 287         depends on SPL
 288         help
 289           Enable support for EXT2/3/4 filesystems with SPL. This permits
 290           U-Boot (or Linux in Falcon mode) to be loaded from an EXT
 291           filesystem from within SPL. Support for the underlying block
 292           device (e.g. MMC or USB) must be enabled separately.
 293
 294 config SPL_FAT_SUPPORT
 295         bool "Support FAT filesystems"
 296         depends on SPL
 297         help
 298           Enable support for FAT and VFAT filesystems with SPL. This
 299           permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
 300           filesystem from within SPL. Support for the underlying block
 301           device (e.g. MMC or USB) must be enabled separately.
 302
 303 config SPL_FPGA_SUPPORT
 304         bool "Support FPGAs"
 305         depends on SPL
 306         help
 307           Enable support for FPGAs in SPL. Field-programmable Gate Arrays
 308           provide software-configurable hardware which is typically used to
 309           implement peripherals (such as UARTs, LCD displays, MMC) or
 310           accelerate custom processing functions, such as image processing
 311           or machine learning. Sometimes it is useful to program the FPGA
 312           as early as possible during boot, and this option can enable that
 313           within SPL.
 314
 315 config SPL_GPIO_SUPPORT
 316         bool "Support GPIO"
 317         depends on SPL
 318         help
 319           Enable support for GPIOs (General-purpose Input/Output) in SPL.
 320           GPIOs allow U-Boot to read the state of an input line (high or
 321           low) and set the state of an output line. This can be used to
 322           drive LEDs, control power to various system parts and read user
 323           input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
 324           for example. Enable this option to build the drivers in
 325           drivers/gpio as part of an SPL build.
 326
 327 config SPL_I2C_SUPPORT
 328         bool "Support I2C"
 329         depends on SPL
 330         help
 331           Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
 332           I2C works with a clock and data line which can be driven by a
 333           one or more masters or slaves. It is a fairly complex bus but is
 334           widely used as it only needs two lines for communication. Speeds of
 335           400kbps are typical but up to 3.4Mbps is supported by some
 336           hardware. I2C can be useful in SPL to configure power management
 337           ICs (PMICs) before raising the CPU clock speed, for example.
 338           Enable this option to build the drivers in drivers/i2c as part of
 339           an SPL build.
 340
 341 config SPL_LIBCOMMON_SUPPORT
 342         bool "Support common libraries"
 343         depends on SPL
 344         help
 345           Enable support for common U-Boot libraries within SPL. These
 346           libraries include common code to deal with U-Boot images,
 347           environment and USB, for example. This option is enabled on many
 348           boards. Enable this option to build the code in common/ as part of
 349           an SPL build.
 350
 351 config SPL_LIBDISK_SUPPORT
 352         bool "Support disk paritions"
 353         depends on SPL
 354         help
 355           Enable support for disk partitions within SPL. 'Disk' is something
 356           of a misnomer as it includes non-spinning media such as flash (as
 357           used in MMC and USB sticks). Partitions provide a way for a disk
 358           to be split up into separate regions, with a partition table placed
 359           at the start or end which describes the location and size of each
 360           'partition'. These partitions are typically uses as individual block
 361           devices, typically with an EXT2 or FAT filesystem in each. This
 362           option enables whatever partition support has been enabled in
 363           U-Boot to also be used in SPL. It brings in the code in disk/.
 364
 365 config SPL_LIBGENERIC_SUPPORT
 366         bool "Support generic libraries"
 367         depends on SPL
 368         help
 369           Enable support for generic U-Boot libraries within SPL. These
 370           libraries include generic code to deal with device tree, hashing,
 371           printf(), compression and the like. This option is enabled on many
 372           boards. Enable this option to build the code in lib/ as part of an
 373           SPL build.
 374
 375 config SPL_MMC_SUPPORT
 376         bool "Support MMC"
 377         depends on SPL && MMC
 378         help
 379           Enable support for MMC (Multimedia Card) within SPL. This enables
 380           the MMC protocol implementation and allows any enabled drivers to
 381           be used within SPL. MMC can be used with or without disk partition
 382           support depending on the application (SPL_LIBDISK_SUPPORT). Enable
 383           this option to build the drivers in drivers/mmc as part of an SPL
 384           build.
 385
 386 config SPL_MPC8XXX_INIT_DDR_SUPPORT
 387         bool "Support MPC8XXX DDR init"
 388         depends on SPL
 389         help
 390           Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
 391           random-access memory) on the MPC8XXX family within SPL. This
 392           allows DRAM to be set up before loading U-Boot into that DRAM,
 393           where it can run.
 394
 395 config SPL_MTD_SUPPORT
 396         bool "Support MTD drivers"
 397         depends on SPL
 398         help
 399           Enable support for MTD (Memory Technology Device) within SPL. MTD
 400           provides a block interface over raw NAND and can also be used with
 401           SPI flash. This allows SPL to load U-Boot from supported MTD
 402           devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
 403           to enable specific MTD drivers.
 404
 405 config SPL_MUSB_NEW_SUPPORT
 406         bool "Support new Mentor Graphics USB"
 407         depends on SPL
 408         help
 409           Enable support for Mentor Graphics USB in SPL. This is a new
 410           driver used by some boards. Enable this option to build
 411           the drivers in drivers/usb/musb-new as part of an SPL build. The
 412           old drivers are in drivers/usb/musb.
 413
 414 config SPL_NAND_SUPPORT
 415         bool "Support NAND flash"
 416         depends on SPL
 417         help
 418           Enable support for NAND (Negative AND) flash in SPL. NAND flash
 419           can be used to allow SPL to load U-Boot from supported devices.
 420           This enables the drivers in drivers/mtd/nand as part of an SPL
 421           build.
 422
 423 config SPL_NET_SUPPORT
 424         bool "Support networking"
 425         depends on SPL
 426         help
 427           Enable support for network devices (such as Ethernet) in SPL.
 428           This permits SPL to load U-Boot over a network link rather than
 429           from an on-board peripheral. Environment support is required since
 430           the network stack uses a number of environment variables. See also
 431           SPL_ETH_SUPPORT.
 432
 433 if SPL_NET_SUPPORT
 434 config SPL_NET_VCI_STRING
 435         string "BOOTP Vendor Class Identifier string sent by SPL"
 436         help
 437           As defined by RFC 2132 the vendor class identifier field can be
 438           sent by the client to identify the vendor type and configuration
 439           of a client.  This is often used in practice to allow for the DHCP
 440           server to specify different files to load depending on if the ROM,
 441           SPL or U-Boot itself makes the request
 442 endif   # if SPL_NET_SUPPORT
 443
 444 config SPL_NO_CPU_SUPPORT
 445         bool "Drop CPU code in SPL"
 446         depends on SPL
 447         help
 448           This is specific to the ARM926EJ-S CPU. It disables the standard
 449           start.S start-up code, presumably so that a replacement can be
 450           used on that CPU. You should not enable it unless you know what
 451           you are doing.
 452
 453 config SPL_NOR_SUPPORT
 454         bool "Support NOR flash"
 455         depends on SPL
 456         help
 457           Enable support for loading U-Boot from memory-mapped NOR (Negative
 458           OR) flash in SPL. NOR flash is slow to write but fast to read, and
 459           a memory-mapped device makes it very easy to access. Loading from
 460           NOR is typically achieved with just a memcpy().
 461
 462 config SPL_ONENAND_SUPPORT
 463         bool "Support OneNAND flash"
 464         depends on SPL
 465         help
 466           Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
 467           a type of NAND flash and therefore can be used to allow SPL to
 468           load U-Boot from supported devices. This enables the drivers in
 469           drivers/mtd/onenand as part of an SPL build.
 470
 471 config SPL_OS_BOOT
 472         bool "Activate Falcon Mode"
 473         depends on SPL && !TI_SECURE_DEVICE
 474         default n
 475         help
 476           Enable booting directly to an OS from SPL.
 477           for more info read doc/README.falcon
 478
 479 if SPL_OS_BOOT
 480 config SYS_OS_BASE
 481         hex "addr, where OS is found"
 482         depends on SPL && SPL_NOR_SUPPORT
 483         help
 484           Specify the address, where the OS image is found, which
 485           gets booted.
 486
 487 endif # SPL_OS_BOOT
 488
 489 config SPL_PCI_SUPPORT
 490         bool "Support PCI drivers"
 491         depends on SPL
 492         help
 493           Enable support for PCI in SPL. For platforms that need PCI to boot,
 494           or must perform some init using PCI in SPL, this provides the
 495           necessary driver support. This enables the drivers in drivers/pci
 496           as part of an SPL build.
 497
 498 config SPL_PCH_SUPPORT
 499         bool "Support PCH drivers"
 500         depends on SPL
 501         help
 502           Enable support for PCH (Platform Controller Hub) devices in SPL.
 503           These are used to set up GPIOs and the SPI peripheral early in
 504           boot. This enables the drivers in drivers/pch as part of an SPL
 505           build.
 506
 507 config SPL_POST_MEM_SUPPORT
 508         bool "Support POST drivers"
 509         depends on SPL
 510         help
 511           Enable support for POST (Power-on Self Test) in SPL. POST is a
 512           procedure that checks that the hardware (CPU or board) appears to
 513           be functionally correctly. It is a sanity check that can be
 514           performed before booting. This enables the drivers in post/drivers
 515           as part of an SPL build.
 516
 517 config SPL_POWER_SUPPORT
 518         bool "Support power drivers"
 519         depends on SPL
 520         help
 521           Enable support for power control in SPL. This includes support
 522           for PMICs (Power-management Integrated Circuits) and some of the
 523           features provided by PMICs. In particular, voltage regulators can
 524           be used to enable/disable power and vary its voltage. That can be
 525           useful in SPL to turn on boot peripherals and adjust CPU voltage
 526           so that the clock speed can be increased. This enables the drivers
 527           in drivers/power, drivers/power/pmic and drivers/power/regulator
 528           as part of an SPL build.
 529
 530 config SPL_RAM_SUPPORT
 531         bool "Support booting from RAM"
 532         depends on SPL
 533         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 534         help
 535           Enable booting of an image in RAM. The image can be preloaded or
 536           it can be loaded by SPL directly into RAM (e.g. using USB).
 537
 538 config SPL_RAM_DEVICE
 539         bool "Support booting from preloaded image in RAM"
 540         depends on SPL_RAM_SUPPORT
 541         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 542         help
 543           Enable booting of an image already loaded in RAM. The image has to
 544           be already in memory when SPL takes over, e.g. loaded by the boot
 545           ROM.
 546
 547 config SPL_RTC_SUPPORT
 548         bool "Support RTC drivers"
 549         depends on SPL
 550         help
 551           Enable RTC (Real-time Clock) support in SPL. This includes support
 552           for reading and setting the time. Some RTC devices also have some
 553           non-volatile (battery-backed) memory which is accessible if
 554           needed. This enables the drivers in drivers/rtc as part of an SPL
 555           build.
 556
 557 config SPL_SATA_SUPPORT
 558         bool "Support loading from SATA"
 559         depends on SPL
 560         help
 561           Enable support for SATA (Serial AT attachment) in SPL. This allows
 562           use of SATA devices such as hard drives and flash drivers for
 563           loading U-Boot. SATA is used in higher-end embedded systems and
 564           can provide higher performance than MMC , at somewhat higher
 565           expense and power consumption. This enables loading from SATA
 566           using a configured device.
 567
 568 config SPL_SERIAL_SUPPORT
 569         bool "Support serial"
 570         depends on SPL
 571         help
 572           Enable support for serial in SPL. This allows use of a serial UART
 573           for displaying messages while SPL is running. It also brings in
 574           printf() and panic() functions. This should normally be enabled
 575           unless there are space reasons not to. Even then, consider
 576           enabling USE_TINY_PRINTF which is a small printf() version.
 577
 578 config SPL_SPI_FLASH_SUPPORT
 579         bool "Support SPI flash drivers"
 580         depends on SPL
 581         help
 582           Enable support for using SPI flash in SPL, and loading U-Boot from
 583           SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
 584           the SPI bus that is used to connect it to a system. It is a simple
 585           but fast bidirectional 4-wire bus (clock, chip select and two data
 586           lines). This enables the drivers in drivers/mtd/spi as part of an
 587           SPL build. This normally requires SPL_SPI_SUPPORT.
 588
 589 config SPL_SPI_SUPPORT
 590         bool "Support SPI drivers"
 591         depends on SPL
 592         help
 593           Enable support for using SPI in SPL. This is used for connecting
 594           to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
 595           more details on that. The SPI driver provides the transport for
 596           data between the SPI flash and the CPU. This option can be used to
 597           enable SPI drivers that are needed for other purposes also, such
 598           as a SPI PMIC.
 599
 600 config SPL_TIMER_SUPPORT
 601         bool "Support timer drivers"
 602         depends on SPL
 603         help
 604           Enable support for timer drivers in SPL. These can be used to get
 605           a timer value when in SPL, or perhaps for implementing a delay
 606           function. This enables the drivers in drivers/timer as part of an
 607           SPL build.
 608
 609 config SPL_USB_HOST_SUPPORT
 610         bool "Support USB host drivers"
 611         depends on SPL
 612         help
 613           Enable access to USB (Universal Serial Bus) host devices so that
 614           SPL can load U-Boot from a connected USB peripheral, such as a USB
 615           flash stick. While USB takes a little longer to start up than most
 616           buses, it is very flexible since many different types of storage
 617           device can be attached. This option enables the drivers in
 618           drivers/usb/host as part of an SPL build.
 619
 620 config SPL_USB_SUPPORT
 621         bool "Support loading from USB"
 622         depends on SPL_USB_HOST_SUPPORT
 623         help
 624           Enable support for USB devices in SPL. This allows use of USB
 625           devices such as hard drives and flash drivers for loading U-Boot.
 626           The actual drivers are enabled separately using the normal U-Boot
 627           config options. This enables loading from USB using a configured
 628           device.
 629
 630 config SPL_USB_GADGET_SUPPORT
 631         bool "Suppport USB Gadget drivers"
 632         depends on SPL
 633         help
 634           Enable USB Gadget API which allows to enable USB device functions
 635           in SPL.
 636
 637 if SPL_USB_GADGET_SUPPORT
 638
 639 config SPL_USBETH_SUPPORT
 640         bool "Support USB Ethernet drivers"
 641         help
 642           Enable access to the USB network subsystem and associated
 643           drivers in SPL. This permits SPL to load U-Boot over a
 644           USB-connected Ethernet link (such as a USB Ethernet dongle) rather
 645           than from an onboard peripheral. Environment support is required
 646           since the network stack uses a number of environment variables.
 647           See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
 648
 649 config SPL_DFU_SUPPORT
 650         bool "Support DFU (Device Firmware Upgarde)"
 651         select SPL_HASH_SUPPORT
 652         select SPL_DFU_NO_RESET
 653         depends on SPL_RAM_SUPPORT
 654         help
 655           This feature enables the DFU (Device Firmware Upgarde) in SPL with
 656           RAM memory device support. The ROM code will load and execute
 657           the SPL built with dfu. The user can load binaries (u-boot/kernel) to
 658           selected device partition from host-pc using dfu-utils.
 659           This feature is useful to flash the binaries to factory or bare-metal
 660           boards using USB interface.
 661
 662 choice
 663         bool "DFU device selection"
 664         depends on SPL_DFU_SUPPORT
 665
 666 config SPL_DFU_RAM
 667         bool "RAM device"
 668         depends on SPL_DFU_SUPPORT && SPL_RAM_SUPPORT
 669         help
 670          select RAM/DDR memory device for loading binary images
 671          (u-boot/kernel) to the selected device partition using
 672          DFU and execute the u-boot/kernel from RAM.
 673
 674 endchoice
 675
 676 endif
 677
 678 config SPL_WATCHDOG_SUPPORT
 679         bool "Support watchdog drivers"
 680         depends on SPL
 681         help
 682           Enable support for watchdog drivers in SPL. A watchdog is
 683           typically a hardware peripheral which can reset the system when it
 684           detects no activity for a while (such as a software crash). This
 685           enables the drivers in drivers/watchdog as part of an SPL build.
 686
 687 config SPL_YMODEM_SUPPORT
 688         bool "Support loading using Ymodem"
 689         depends on SPL
 690         help
 691           While loading from serial is slow it can be a useful backup when
 692           there is no other option. The Ymodem protocol provides a reliable
 693           means of transmitting U-Boot over a serial line for using in SPL,
 694           with a checksum to ensure correctness.
 695
 696 config TPL_ENV_SUPPORT
 697         bool "Support an environment"
 698         depends on TPL
 699         help
 700           Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
 701
 702 config TPL_I2C_SUPPORT
 703         bool "Support I2C"
 704         depends on TPL
 705         help
 706           Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
 707           details.
 708
 709 config TPL_LIBCOMMON_SUPPORT
 710         bool "Support common libraries"
 711         depends on TPL
 712         help
 713           Enable support for common U-Boot libraries within TPL. See
 714           SPL_LIBCOMMON_SUPPORT for details.
 715
 716 config TPL_LIBGENERIC_SUPPORT
 717         bool "Support generic libraries"
 718         depends on TPL
 719         help
 720           Enable support for generic U-Boot libraries within TPL. See
 721           SPL_LIBGENERIC_SUPPORT for details.
 722
 723 config TPL_MPC8XXX_INIT_DDR_SUPPORT
 724         bool "Support MPC8XXX DDR init"
 725         depends on TPL
 726         help
 727           Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
 728           SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
 729
 730 config TPL_MMC_SUPPORT
 731         bool "Support MMC"
 732         depends on TPL
 733         help
 734           Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
 735
 736 config TPL_NAND_SUPPORT
 737         bool "Support NAND flash"
 738         depends on TPL
 739         help
 740           Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
 741
 742 config TPL_SERIAL_SUPPORT
 743         bool "Support serial"
 744         depends on TPL
 745         help
 746           Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
 747           details.
 748
 749 config TPL_SPI_FLASH_SUPPORT
 750         bool "Support SPI flash drivers"
 751         depends on TPL
 752         help
 753           Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
 754           for details.
 755
 756 config TPL_SPI_SUPPORT
 757         bool "Support SPI drivers"
 758         depends on TPL
 759         help
 760           Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for
 761           details.
 762
 763 endmenu