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_BOARD_INIT
  20         depends on SPL
  21         bool "Call board-specific initialization in SPL"
  22         help
  23           If this option is enabled, U-Boot will call the function
  24           spl_board_init() from board_init_r(). This function should be
  25           provided by the board.
  26
  27 config SPL_RAW_IMAGE_SUPPORT
  28         bool "Support SPL loading and booting of RAW images"
  29         depends on SPL
  30         default n if (ARCH_MX6 && (SPL_MMC_SUPPORT || SPL_SATA_SUPPORT))
  31         default y if !TI_SECURE_DEVICE
  32         help
  33           SPL will support loading and booting a RAW image 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_LEGACY_IMAGE_SUPPORT
  38         bool "Support SPL loading and booting of Legacy images"
  39         default y if !TI_SECURE_DEVICE
  40         help
  41           SPL will support loading and booting Legacy images when this option
  42           is y. If this is not set, SPL will move on to other available
  43           boot media to find a suitable image.
  44
  45 config SPL_SYS_MALLOC_SIMPLE
  46         bool
  47         depends on SPL
  48         prompt "Only use malloc_simple functions in the SPL"
  49         help
  50           Say Y here to only use the *_simple malloc functions from
  51           malloc_simple.c, rather then using the versions from dlmalloc.c;
  52           this will make the SPL binary smaller at the cost of more heap
  53           usage as the *_simple malloc functions do not re-use free-ed mem.
  54
  55 config SPL_STACK_R
  56         depends on SPL
  57         bool "Enable SDRAM location for SPL stack"
  58         help
  59           SPL starts off execution in SRAM and thus typically has only a small
  60           stack available. Since SPL sets up DRAM while in its board_init_f()
  61           function, it is possible for the stack to move there before
  62           board_init_r() is reached. This option enables a special SDRAM
  63           location for the SPL stack. U-Boot SPL switches to this after
  64           board_init_f() completes, and before board_init_r() starts.
  65
  66 config SPL_STACK_R_ADDR
  67         depends on SPL_STACK_R
  68         hex "SDRAM location for SPL stack"
  69         help
  70           Specify the address in SDRAM for the SPL stack. This will be set up
  71           before board_init_r() is called.
  72
  73 config SPL_STACK_R_MALLOC_SIMPLE_LEN
  74         depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
  75         hex "Size of malloc_simple heap after switching to DRAM SPL stack"
  76         default 0x100000
  77         help
  78           Specify the amount of the stack to use as memory pool for
  79           malloc_simple after switching the stack to DRAM. This may be set
  80           to give board_init_r() a larger heap then the initial heap in
  81           SRAM which is limited to SYS_MALLOC_F_LEN bytes.
  82
  83 config SPL_SEPARATE_BSS
  84         depends on SPL
  85         bool "BSS section is in a different memory region from text"
  86         help
  87           Some platforms need a large BSS region in SPL and can provide this
  88           because RAM is already set up. In this case BSS can be moved to RAM.
  89           This option should then be enabled so that the correct device tree
  90           location is used. Normally we put the device tree at the end of BSS
  91           but with this option enabled, it goes at _image_binary_end.
  92
  93 config SPL_DISPLAY_PRINT
  94         depends on SPL
  95         bool "Display a board-specific message in SPL"
  96         help
  97           If this option is enabled, U-Boot will call the function
  98           spl_display_print() immediately after displaying the SPL console
  99           banner ("U-Boot SPL ..."). This function should be provided by
 100           the board.
 101
 102 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
 103         bool "MMC raw mode: by sector"
 104         depends on SPL
 105         default y if ARCH_SUNXI || ARCH_DAVINCI || ARCH_UNIPHIER ||ARCH_MX6 || \
 106                      ARCH_ROCKCHIP || ARCH_MVEBU ||  ARCH_SOCFPGA || \
 107                      ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
 108                      OMAP44XX || OMAP54XX || AM33XX || AM43XX
 109         help
 110           Use sector number for specifying U-Boot location on MMC/SD in
 111           raw mode.
 112
 113 config SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR
 114         hex "Address on the MMC to load U-Boot from"
 115         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR
 116         default 0x50 if ARCH_SUNXI
 117         default 0x75 if ARCH_DAVINCI
 118         default 0x8a if ARCH_MX6
 119         default 0x100 if ARCH_ROCKCHIP || ARCH_UNIPHIER
 120         default 0x140 if ARCH_MVEBU
 121         default 0x200 if ARCH_SOCFPGA || ARCH_AT91
 122         default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
 123                          OMAP54XX || AM33XX || AM43XX
 124         help
 125           Address on the MMC to load U-Boot from, when the MMC is being used
 126           in raw mode. Units: MMC sectors (1 sector = 512 bytes).
 127
 128 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 129         bool "MMC Raw mode: by partition"
 130         depends on SPL
 131         help
 132           Use a partition for loading U-Boot when using MMC/SD in raw mode.
 133
 134 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
 135         hex "Partition to use to load U-Boot from"
 136         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 137         default 1
 138         help
 139           Partition on the MMC to load U-Boot from when the MMC is being
 140           used in raw mode
 141
 142 config SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 143         bool "MMC raw mode: by partition type"
 144         depends on SPL && DOS_PARTITION && \
 145                 SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 146         help
 147           Use partition type for specifying U-Boot partition on MMC/SD in
 148           raw mode. U-Boot will be loaded from the first partition of this
 149           type to be found.
 150
 151 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_TYPE
 152         hex "Partition Type on the MMC to load U-Boot from"
 153         depends on SPL && SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 154         help
 155           Partition Type on the MMC to load U-Boot from, when the MMC is being
 156           used in raw mode.
 157
 158 config TPL
 159         bool
 160         depends on SPL && SUPPORT_TPL
 161         prompt "Enable TPL"
 162         help
 163           If you want to build TPL as well as the normal image and SPL, say Y.
 164
 165 config SPL_CRC32_SUPPORT
 166         bool "Support CRC32"
 167         depends on SPL_FIT
 168         help
 169           Enable this to support CRC32 in FIT images within SPL. This is a
 170           32-bit checksum value that can be used to verify images. This is
 171           the least secure type of checksum, suitable for detected
 172           accidental image corruption. For secure applications you should
 173           consider SHA1 or SHA256.
 174
 175 config SPL_MD5_SUPPORT
 176         bool "Support MD5"
 177         depends on SPL_FIT
 178         help
 179           Enable this to support MD5 in FIT images within SPL. An MD5
 180           checksum is a 128-bit hash value used to check that the image
 181           contents have not been corrupted. Note that MD5 is not considered
 182           secure as it is possible (with a brute-force attack) to adjust the
 183           image while still retaining the same MD5 hash value. For secure
 184           applications where images may be changed maliciously, you should
 185           consider SHA1 or SHA256.
 186
 187 config SPL_SHA1_SUPPORT
 188         bool "Support SHA1"
 189         depends on SPL_FIT
 190         select SHA1
 191         help
 192           Enable this to support SHA1 in FIT images within SPL. A SHA1
 193           checksum is a 160-bit (20-byte) hash value used to check that the
 194           image contents have not been corrupted or maliciously altered.
 195           While SHA1 is fairly secure it is coming to the end of its life
 196           due to the expanding computing power avaiable to brute-force
 197           attacks. For more security, consider SHA256.
 198
 199 config SPL_SHA256_SUPPORT
 200         bool "Support SHA256"
 201         depends on SPL_FIT
 202         select SHA256
 203         help
 204           Enable this to support SHA256 in FIT images within SPL. A SHA256
 205           checksum is a 256-bit (32-byte) hash value used to check that the
 206           image contents have not been corrupted. SHA256 is recommended for
 207           use in secure applications since (as at 2016) there is no known
 208           feasible attack that could produce a 'collision' with differing
 209           input data. Use this for the highest security. Note that only the
 210           SHA256 variant is supported: SHA512 and others are not currently
 211           supported in U-Boot.
 212
 213 config SPL_CPU_SUPPORT
 214         bool "Support CPU drivers"
 215         depends on SPL
 216         help
 217           Enable this to support CPU drivers in SPL. These drivers can set
 218           up CPUs and provide information about them such as the model and
 219           name. This can be useful in SPL since setting up the CPUs earlier
 220           may improve boot performance. Enable this option to build the
 221           drivers in drivers/cpu as part of an SPL build.
 222
 223 config SPL_CRYPTO_SUPPORT
 224         bool "Support crypto drivers"
 225         depends on SPL
 226         help
 227           Enable crypto drivers in SPL. These drivers can be used to
 228           accelerate secure boot processing in secure applications. Enable
 229           this option to build the drivers in drivers/crypto as part of an
 230           SPL build.
 231
 232 config SPL_HASH_SUPPORT
 233         bool "Support hashing drivers"
 234         select SHA1
 235         select SHA256
 236         depends on SPL
 237         help
 238           Enable hashing drivers in SPL. These drivers can be used to
 239           accelerate secure boot processing in secure applications. Enable
 240           this option to build system-specific drivers for hash acceleration
 241           as part of an SPL build.
 242
 243 config SPL_DMA_SUPPORT
 244         bool "Support DMA drivers"
 245         depends on SPL
 246         help
 247           Enable DMA (direct-memory-access) drivers in SPL. These drivers
 248           can be used to handle memory-to-peripheral data transfer without
 249           the CPU moving the data. Enable this option to build the drivers
 250           in drivers/dma as part of an SPL build.
 251
 252 config SPL_DRIVERS_MISC_SUPPORT
 253         bool "Support misc drivers"
 254         depends on SPL
 255         help
 256           Enable miscellaneous drivers in SPL. These drivers perform various
 257           tasks that don't fall nicely into other categories, Enable this
 258           option to build the drivers in drivers/misc as part of an SPL
 259           build, for those that support building in SPL (not all drivers do).
 260
 261 config SPL_ENV_SUPPORT
 262         bool "Support an environment"
 263         depends on SPL
 264         help
 265           Enable environment support in SPL. The U-Boot environment provides
 266           a number of settings (essentially name/value pairs) which can
 267           control many aspects of U-Boot's operation. Normally this is not
 268           needed in SPL as it has a much simpler task with less
 269           configuration. But some boards use this to support 'Falcon' boot
 270           on EXT2 and FAT, where SPL boots directly into Linux without
 271           starting U-Boot first. Enabling this option will make getenv()
 272           and setenv() available in SPL.
 273
 274 config SPL_SAVEENV
 275         bool "Support save environment"
 276         depends on SPL && SPL_ENV_SUPPORT
 277         help
 278           Enable save environment support in SPL after setenv. By default
 279           the saveenv option is not provided in SPL, but some boards need
 280           this support in 'Falcon' boot, where SPL need to boot from
 281           different images based on environment variable set by OS. For
 282           example OS may set "reboot_image" environment variable to
 283           "recovery" inorder to boot recovery image by SPL. The SPL read
 284           "reboot_image" and act accordingly and change the reboot_image
 285           to default mode using setenv and save the environemnt.
 286
 287 config SPL_ETH_SUPPORT
 288         bool "Support Ethernet"
 289         depends on SPL_ENV_SUPPORT
 290         help
 291           Enable access to the network subsystem and associated Ethernet
 292           drivers in SPL. This permits SPL to load U-Boot over an Ethernet
 293           link rather than from an on-board peripheral. Environment support
 294           is required since the network stack uses a number of environment
 295           variables. See also SPL_NET_SUPPORT.
 296
 297 config SPL_EXT_SUPPORT
 298         bool "Support EXT filesystems"
 299         depends on SPL
 300         help
 301           Enable support for EXT2/3/4 filesystems with SPL. This permits
 302           U-Boot (or Linux in Falcon mode) to be loaded from an EXT
 303           filesystem from within SPL. Support for the underlying block
 304           device (e.g. MMC or USB) must be enabled separately.
 305
 306 config SPL_FAT_SUPPORT
 307         bool "Support FAT filesystems"
 308         depends on SPL
 309         select FS_FAT
 310         help
 311           Enable support for FAT and VFAT filesystems with SPL. This
 312           permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
 313           filesystem from within SPL. Support for the underlying block
 314           device (e.g. MMC or USB) must be enabled separately.
 315
 316 config SPL_FPGA_SUPPORT
 317         bool "Support FPGAs"
 318         depends on SPL
 319         help
 320           Enable support for FPGAs in SPL. Field-programmable Gate Arrays
 321           provide software-configurable hardware which is typically used to
 322           implement peripherals (such as UARTs, LCD displays, MMC) or
 323           accelerate custom processing functions, such as image processing
 324           or machine learning. Sometimes it is useful to program the FPGA
 325           as early as possible during boot, and this option can enable that
 326           within SPL.
 327
 328 config SPL_GPIO_SUPPORT
 329         bool "Support GPIO"
 330         depends on SPL
 331         help
 332           Enable support for GPIOs (General-purpose Input/Output) in SPL.
 333           GPIOs allow U-Boot to read the state of an input line (high or
 334           low) and set the state of an output line. This can be used to
 335           drive LEDs, control power to various system parts and read user
 336           input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
 337           for example. Enable this option to build the drivers in
 338           drivers/gpio as part of an SPL build.
 339
 340 config SPL_I2C_SUPPORT
 341         bool "Support I2C"
 342         depends on SPL
 343         help
 344           Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
 345           I2C works with a clock and data line which can be driven by a
 346           one or more masters or slaves. It is a fairly complex bus but is
 347           widely used as it only needs two lines for communication. Speeds of
 348           400kbps are typical but up to 3.4Mbps is supported by some
 349           hardware. I2C can be useful in SPL to configure power management
 350           ICs (PMICs) before raising the CPU clock speed, for example.
 351           Enable this option to build the drivers in drivers/i2c as part of
 352           an SPL build.
 353
 354 config SPL_LIBCOMMON_SUPPORT
 355         bool "Support common libraries"
 356         depends on SPL
 357         help
 358           Enable support for common U-Boot libraries within SPL. These
 359           libraries include common code to deal with U-Boot images,
 360           environment and USB, for example. This option is enabled on many
 361           boards. Enable this option to build the code in common/ as part of
 362           an SPL build.
 363
 364 config SPL_LIBDISK_SUPPORT
 365         bool "Support disk paritions"
 366         depends on SPL
 367         help
 368           Enable support for disk partitions within SPL. 'Disk' is something
 369           of a misnomer as it includes non-spinning media such as flash (as
 370           used in MMC and USB sticks). Partitions provide a way for a disk
 371           to be split up into separate regions, with a partition table placed
 372           at the start or end which describes the location and size of each
 373           'partition'. These partitions are typically uses as individual block
 374           devices, typically with an EXT2 or FAT filesystem in each. This
 375           option enables whatever partition support has been enabled in
 376           U-Boot to also be used in SPL. It brings in the code in disk/.
 377
 378 config SPL_LIBGENERIC_SUPPORT
 379         bool "Support generic libraries"
 380         depends on SPL
 381         help
 382           Enable support for generic U-Boot libraries within SPL. These
 383           libraries include generic code to deal with device tree, hashing,
 384           printf(), compression and the like. This option is enabled on many
 385           boards. Enable this option to build the code in lib/ as part of an
 386           SPL build.
 387
 388 config SPL_MMC_SUPPORT
 389         bool "Support MMC"
 390         depends on SPL && MMC
 391         help
 392           Enable support for MMC (Multimedia Card) within SPL. This enables
 393           the MMC protocol implementation and allows any enabled drivers to
 394           be used within SPL. MMC can be used with or without disk partition
 395           support depending on the application (SPL_LIBDISK_SUPPORT). Enable
 396           this option to build the drivers in drivers/mmc as part of an SPL
 397           build.
 398
 399 config SPL_MPC8XXX_INIT_DDR_SUPPORT
 400         bool "Support MPC8XXX DDR init"
 401         depends on SPL
 402         help
 403           Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
 404           random-access memory) on the MPC8XXX family within SPL. This
 405           allows DRAM to be set up before loading U-Boot into that DRAM,
 406           where it can run.
 407
 408 config SPL_MTD_SUPPORT
 409         bool "Support MTD drivers"
 410         depends on SPL
 411         help
 412           Enable support for MTD (Memory Technology Device) within SPL. MTD
 413           provides a block interface over raw NAND and can also be used with
 414           SPI flash. This allows SPL to load U-Boot from supported MTD
 415           devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
 416           to enable specific MTD drivers.
 417
 418 config SPL_MUSB_NEW_SUPPORT
 419         bool "Support new Mentor Graphics USB"
 420         depends on SPL
 421         help
 422           Enable support for Mentor Graphics USB in SPL. This is a new
 423           driver used by some boards. Enable this option to build
 424           the drivers in drivers/usb/musb-new as part of an SPL build. The
 425           old drivers are in drivers/usb/musb.
 426
 427 config SPL_NAND_SUPPORT
 428         bool "Support NAND flash"
 429         depends on SPL
 430         help
 431           Enable support for NAND (Negative AND) flash in SPL. NAND flash
 432           can be used to allow SPL to load U-Boot from supported devices.
 433           This enables the drivers in drivers/mtd/nand as part of an SPL
 434           build.
 435
 436 config SPL_NET_SUPPORT
 437         bool "Support networking"
 438         depends on SPL
 439         help
 440           Enable support for network devices (such as Ethernet) in SPL.
 441           This permits SPL to load U-Boot over a network link rather than
 442           from an on-board peripheral. Environment support is required since
 443           the network stack uses a number of environment variables. See also
 444           SPL_ETH_SUPPORT.
 445
 446 if SPL_NET_SUPPORT
 447 config SPL_NET_VCI_STRING
 448         string "BOOTP Vendor Class Identifier string sent by SPL"
 449         help
 450           As defined by RFC 2132 the vendor class identifier field can be
 451           sent by the client to identify the vendor type and configuration
 452           of a client.  This is often used in practice to allow for the DHCP
 453           server to specify different files to load depending on if the ROM,
 454           SPL or U-Boot itself makes the request
 455 endif   # if SPL_NET_SUPPORT
 456
 457 config SPL_NO_CPU_SUPPORT
 458         bool "Drop CPU code in SPL"
 459         depends on SPL
 460         help
 461           This is specific to the ARM926EJ-S CPU. It disables the standard
 462           start.S start-up code, presumably so that a replacement can be
 463           used on that CPU. You should not enable it unless you know what
 464           you are doing.
 465
 466 config SPL_NOR_SUPPORT
 467         bool "Support NOR flash"
 468         depends on SPL
 469         help
 470           Enable support for loading U-Boot from memory-mapped NOR (Negative
 471           OR) flash in SPL. NOR flash is slow to write but fast to read, and
 472           a memory-mapped device makes it very easy to access. Loading from
 473           NOR is typically achieved with just a memcpy().
 474
 475 config SPL_ONENAND_SUPPORT
 476         bool "Support OneNAND flash"
 477         depends on SPL
 478         help
 479           Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
 480           a type of NAND flash and therefore can be used to allow SPL to
 481           load U-Boot from supported devices. This enables the drivers in
 482           drivers/mtd/onenand as part of an SPL build.
 483
 484 config SPL_OS_BOOT
 485         bool "Activate Falcon Mode"
 486         depends on SPL && !TI_SECURE_DEVICE
 487         default n
 488         help
 489           Enable booting directly to an OS from SPL.
 490           for more info read doc/README.falcon
 491
 492 if SPL_OS_BOOT
 493 config SYS_OS_BASE
 494         hex "addr, where OS is found"
 495         depends on SPL && SPL_NOR_SUPPORT
 496         help
 497           Specify the address, where the OS image is found, which
 498           gets booted.
 499
 500 endif # SPL_OS_BOOT
 501
 502 config SPL_PCI_SUPPORT
 503         bool "Support PCI drivers"
 504         depends on SPL
 505         help
 506           Enable support for PCI in SPL. For platforms that need PCI to boot,
 507           or must perform some init using PCI in SPL, this provides the
 508           necessary driver support. This enables the drivers in drivers/pci
 509           as part of an SPL build.
 510
 511 config SPL_PCH_SUPPORT
 512         bool "Support PCH drivers"
 513         depends on SPL
 514         help
 515           Enable support for PCH (Platform Controller Hub) devices in SPL.
 516           These are used to set up GPIOs and the SPI peripheral early in
 517           boot. This enables the drivers in drivers/pch as part of an SPL
 518           build.
 519
 520 config SPL_POST_MEM_SUPPORT
 521         bool "Support POST drivers"
 522         depends on SPL
 523         help
 524           Enable support for POST (Power-on Self Test) in SPL. POST is a
 525           procedure that checks that the hardware (CPU or board) appears to
 526           be functionally correctly. It is a sanity check that can be
 527           performed before booting. This enables the drivers in post/drivers
 528           as part of an SPL build.
 529
 530 config SPL_POWER_SUPPORT
 531         bool "Support power drivers"
 532         depends on SPL
 533         help
 534           Enable support for power control in SPL. This includes support
 535           for PMICs (Power-management Integrated Circuits) and some of the
 536           features provided by PMICs. In particular, voltage regulators can
 537           be used to enable/disable power and vary its voltage. That can be
 538           useful in SPL to turn on boot peripherals and adjust CPU voltage
 539           so that the clock speed can be increased. This enables the drivers
 540           in drivers/power, drivers/power/pmic and drivers/power/regulator
 541           as part of an SPL build.
 542
 543 config SPL_RAM_SUPPORT
 544         bool "Support booting from RAM"
 545         depends on SPL
 546         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 547         help
 548           Enable booting of an image in RAM. The image can be preloaded or
 549           it can be loaded by SPL directly into RAM (e.g. using USB).
 550
 551 config SPL_RAM_DEVICE
 552         bool "Support booting from preloaded image in RAM"
 553         depends on SPL_RAM_SUPPORT
 554         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 555         help
 556           Enable booting of an image already loaded in RAM. The image has to
 557           be already in memory when SPL takes over, e.g. loaded by the boot
 558           ROM.
 559
 560 config SPL_RTC_SUPPORT
 561         bool "Support RTC drivers"
 562         depends on SPL
 563         help
 564           Enable RTC (Real-time Clock) support in SPL. This includes support
 565           for reading and setting the time. Some RTC devices also have some
 566           non-volatile (battery-backed) memory which is accessible if
 567           needed. This enables the drivers in drivers/rtc as part of an SPL
 568           build.
 569
 570 config SPL_SATA_SUPPORT
 571         bool "Support loading from SATA"
 572         depends on SPL
 573         help
 574           Enable support for SATA (Serial AT attachment) in SPL. This allows
 575           use of SATA devices such as hard drives and flash drivers for
 576           loading U-Boot. SATA is used in higher-end embedded systems and
 577           can provide higher performance than MMC , at somewhat higher
 578           expense and power consumption. This enables loading from SATA
 579           using a configured device.
 580
 581 config SPL_SERIAL_SUPPORT
 582         bool "Support serial"
 583         depends on SPL
 584         help
 585           Enable support for serial in SPL. This allows use of a serial UART
 586           for displaying messages while SPL is running. It also brings in
 587           printf() and panic() functions. This should normally be enabled
 588           unless there are space reasons not to. Even then, consider
 589           enabling USE_TINY_PRINTF which is a small printf() version.
 590
 591 config SPL_SPI_FLASH_SUPPORT
 592         bool "Support SPI flash drivers"
 593         depends on SPL
 594         help
 595           Enable support for using SPI flash in SPL, and loading U-Boot from
 596           SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
 597           the SPI bus that is used to connect it to a system. It is a simple
 598           but fast bidirectional 4-wire bus (clock, chip select and two data
 599           lines). This enables the drivers in drivers/mtd/spi as part of an
 600           SPL build. This normally requires SPL_SPI_SUPPORT.
 601
 602 config SPL_SPI_SUPPORT
 603         bool "Support SPI drivers"
 604         depends on SPL
 605         help
 606           Enable support for using SPI in SPL. This is used for connecting
 607           to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
 608           more details on that. The SPI driver provides the transport for
 609           data between the SPI flash and the CPU. This option can be used to
 610           enable SPI drivers that are needed for other purposes also, such
 611           as a SPI PMIC.
 612
 613 config SPL_TIMER_SUPPORT
 614         bool "Support timer drivers"
 615         depends on SPL
 616         help
 617           Enable support for timer drivers in SPL. These can be used to get
 618           a timer value when in SPL, or perhaps for implementing a delay
 619           function. This enables the drivers in drivers/timer as part of an
 620           SPL build.
 621
 622 config SPL_USB_HOST_SUPPORT
 623         bool "Support USB host drivers"
 624         depends on SPL
 625         help
 626           Enable access to USB (Universal Serial Bus) host devices so that
 627           SPL can load U-Boot from a connected USB peripheral, such as a USB
 628           flash stick. While USB takes a little longer to start up than most
 629           buses, it is very flexible since many different types of storage
 630           device can be attached. This option enables the drivers in
 631           drivers/usb/host as part of an SPL build.
 632
 633 config SPL_USB_SUPPORT
 634         bool "Support loading from USB"
 635         depends on SPL_USB_HOST_SUPPORT
 636         help
 637           Enable support for USB devices in SPL. This allows use of USB
 638           devices such as hard drives and flash drivers for loading U-Boot.
 639           The actual drivers are enabled separately using the normal U-Boot
 640           config options. This enables loading from USB using a configured
 641           device.
 642
 643 config SPL_USB_GADGET_SUPPORT
 644         bool "Suppport USB Gadget drivers"
 645         depends on SPL
 646         help
 647           Enable USB Gadget API which allows to enable USB device functions
 648           in SPL.
 649
 650 if SPL_USB_GADGET_SUPPORT
 651
 652 config SPL_USBETH_SUPPORT
 653         bool "Support USB Ethernet drivers"
 654         help
 655           Enable access to the USB network subsystem and associated
 656           drivers in SPL. This permits SPL to load U-Boot over a
 657           USB-connected Ethernet link (such as a USB Ethernet dongle) rather
 658           than from an onboard peripheral. Environment support is required
 659           since the network stack uses a number of environment variables.
 660           See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
 661
 662 config SPL_DFU_SUPPORT
 663         bool "Support DFU (Device Firmware Upgarde)"
 664         select SPL_HASH_SUPPORT
 665         select SPL_DFU_NO_RESET
 666         depends on SPL_RAM_SUPPORT
 667         help
 668           This feature enables the DFU (Device Firmware Upgarde) in SPL with
 669           RAM memory device support. The ROM code will load and execute
 670           the SPL built with dfu. The user can load binaries (u-boot/kernel) to
 671           selected device partition from host-pc using dfu-utils.
 672           This feature is useful to flash the binaries to factory or bare-metal
 673           boards using USB interface.
 674
 675 choice
 676         bool "DFU device selection"
 677         depends on SPL_DFU_SUPPORT
 678
 679 config SPL_DFU_RAM
 680         bool "RAM device"
 681         depends on SPL_DFU_SUPPORT && SPL_RAM_SUPPORT
 682         help
 683          select RAM/DDR memory device for loading binary images
 684          (u-boot/kernel) to the selected device partition using
 685          DFU and execute the u-boot/kernel from RAM.
 686
 687 endchoice
 688
 689 endif
 690
 691 config SPL_WATCHDOG_SUPPORT
 692         bool "Support watchdog drivers"
 693         depends on SPL
 694         help
 695           Enable support for watchdog drivers in SPL. A watchdog is
 696           typically a hardware peripheral which can reset the system when it
 697           detects no activity for a while (such as a software crash). This
 698           enables the drivers in drivers/watchdog as part of an SPL build.
 699
 700 config SPL_YMODEM_SUPPORT
 701         bool "Support loading using Ymodem"
 702         depends on SPL
 703         help
 704           While loading from serial is slow it can be a useful backup when
 705           there is no other option. The Ymodem protocol provides a reliable
 706           means of transmitting U-Boot over a serial line for using in SPL,
 707           with a checksum to ensure correctness.
 708
 709 config SPL_ATF_SUPPORT
 710         bool "Support ARM Trusted Firmware"
 711         depends on SPL && ARM64
 712         help
 713           ATF(ARM Trusted Firmware) is a component for ARM arch64 which which
 714           is loaded by SPL(which is considered as BL2 in ATF terminology).
 715           More detail at: https://github.com/ARM-software/arm-trusted-firmware
 716
 717 config SPL_ATF_TEXT_BASE
 718         depends on SPL_ATF_SUPPORT
 719         hex "ATF BL31 base address"
 720         help
 721           This is the base address in memory for ATF BL31 text and entry point.
 722
 723 config TPL_ENV_SUPPORT
 724         bool "Support an environment"
 725         depends on TPL
 726         help
 727           Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
 728
 729 config TPL_I2C_SUPPORT
 730         bool "Support I2C"
 731         depends on TPL
 732         help
 733           Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
 734           details.
 735
 736 config TPL_LIBCOMMON_SUPPORT
 737         bool "Support common libraries"
 738         depends on TPL
 739         help
 740           Enable support for common U-Boot libraries within TPL. See
 741           SPL_LIBCOMMON_SUPPORT for details.
 742
 743 config TPL_LIBGENERIC_SUPPORT
 744         bool "Support generic libraries"
 745         depends on TPL
 746         help
 747           Enable support for generic U-Boot libraries within TPL. See
 748           SPL_LIBGENERIC_SUPPORT for details.
 749
 750 config TPL_MPC8XXX_INIT_DDR_SUPPORT
 751         bool "Support MPC8XXX DDR init"
 752         depends on TPL
 753         help
 754           Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
 755           SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
 756
 757 config TPL_MMC_SUPPORT
 758         bool "Support MMC"
 759         depends on TPL && MMC
 760         help
 761           Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
 762
 763 config TPL_NAND_SUPPORT
 764         bool "Support NAND flash"
 765         depends on TPL
 766         help
 767           Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
 768
 769 config TPL_SERIAL_SUPPORT
 770         bool "Support serial"
 771         depends on TPL
 772         help
 773           Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
 774           details.
 775
 776 config TPL_SPI_FLASH_SUPPORT
 777         bool "Support SPI flash drivers"
 778         depends on TPL
 779         help
 780           Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
 781           for details.
 782
 783 config TPL_SPI_SUPPORT
 784         bool "Support SPI drivers"
 785         depends on TPL
 786         help
 787           Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for
 788           details.
 789
 790 endmenu