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 0x80 if ARCH_UNIPHIER
  90         default 0x8a if ARCH_MX6
  91         default 0x100 if ARCH_ROCKCHIP
  92         default 0x140 if ARCH_MVEBU
  93         default 0x200 if ARCH_SOCFPGA || ARCH_AT91
  94         default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
  95                          OMAP54XX || AM33XX || AM43XX
  96         help
  97           Address on the MMC to load U-Boot from, when the MMC is being used
  98           in raw mode. Units: MMC sectors (1 sector = 512 bytes).
  99
 100 config TPL
 101         bool
 102         depends on SPL && SUPPORT_TPL
 103         prompt "Enable TPL"
 104         help
 105           If you want to build TPL as well as the normal image and SPL, say Y.
 106
 107 config SPL_CRC32_SUPPORT
 108         bool "Support CRC32"
 109         depends on SPL_FIT
 110         help
 111           Enable this to support CRC32 in FIT images within SPL. This is a
 112           32-bit checksum value that can be used to verify images. This is
 113           the least secure type of checksum, suitable for detected
 114           accidental image corruption. For secure applications you should
 115           consider SHA1 or SHA256.
 116
 117 config SPL_MD5_SUPPORT
 118         bool "Support MD5"
 119         depends on SPL_FIT
 120         help
 121           Enable this to support MD5 in FIT images within SPL. An MD5
 122           checksum is a 128-bit hash value used to check that the image
 123           contents have not been corrupted. Note that MD5 is not considered
 124           secure as it is possible (with a brute-force attack) to adjust the
 125           image while still retaining the same MD5 hash value. For secure
 126           applications where images may be changed maliciously, you should
 127           consider SHA1 or SHA256.
 128
 129 config SPL_SHA1_SUPPORT
 130         bool "Support SHA1"
 131         depends on SPL_FIT
 132         help
 133           Enable this to support SHA1 in FIT images within SPL. A SHA1
 134           checksum is a 160-bit (20-byte) hash value used to check that the
 135           image contents have not been corrupted or maliciously altered.
 136           While SHA1 is fairly secure it is coming to the end of its life
 137           due to the expanding computing power avaiable to brute-force
 138           attacks. For more security, consider SHA256.
 139
 140 config SPL_SHA256_SUPPORT
 141         bool "Support SHA256"
 142         depends on SPL_FIT
 143         help
 144           Enable this to support SHA256 in FIT images within SPL. A SHA256
 145           checksum is a 256-bit (32-byte) hash value used to check that the
 146           image contents have not been corrupted. SHA256 is recommended for
 147           use in secure applications since (as at 2016) there is no known
 148           feasible attack that could produce a 'collision' with differing
 149           input data. Use this for the highest security. Note that only the
 150           SHA256 variant is supported: SHA512 and others are not currently
 151           supported in U-Boot.
 152
 153 config SPL_CRYPTO_SUPPORT
 154         bool "Support crypto drivers"
 155         depends on SPL
 156         help
 157           Enable crypto drivers in SPL. These drivers can be used to
 158           accelerate secure boot processing in secure applications. Enable
 159           this option to build the drivers in drivers/crypto as part of an
 160           SPL build.
 161
 162 config SPL_HASH_SUPPORT
 163         bool "Support hashing drivers"
 164         depends on SPL
 165         help
 166           Enable hashing drivers in SPL. These drivers can be used to
 167           accelerate secure boot processing in secure applications. Enable
 168           this option to build system-specific drivers for hash acceleration
 169           as part of an SPL build.
 170
 171 config SPL_DMA_SUPPORT
 172         bool "Support DMA drivers"
 173         depends on SPL
 174         help
 175           Enable DMA (direct-memory-access) drivers in SPL. These drivers
 176           can be used to handle memory-to-peripheral data transfer without
 177           the CPU moving the data. Enable this option to build the drivers
 178           in drivers/dma as part of an SPL build.
 179
 180 config SPL_DRIVERS_MISC_SUPPORT
 181         bool "Support misc drivers"
 182         depends on SPL
 183         help
 184           Enable miscellaneous drivers in SPL. These drivers perform various
 185           tasks that don't fall nicely into other categories, Enable this
 186           option to build the drivers in drivers/misc as part of an SPL
 187           build, for those that support building in SPL (not all drivers do).
 188
 189 config SPL_ENV_SUPPORT
 190         bool "Support an environment"
 191         depends on SPL
 192         help
 193           Enable environment support in SPL. The U-Boot environment provides
 194           a number of settings (essentially name/value pairs) which can
 195           control many aspects of U-Boot's operation. Normally this is not
 196           needed in SPL as it has a much simpler task with less
 197           configuration. But some boards use this to support 'Falcon' boot
 198           on EXT2 and FAT, where SPL boots directly into Linux without
 199           starting U-Boot first. Enabling this option will make getenv()
 200           and setenv() available in SPL.
 201
 202 config SPL_SAVEENV
 203         bool "Support save environment"
 204         depends on SPL && SPL_ENV_SUPPORT
 205         help
 206           Enable save environment support in SPL after setenv. By default
 207           the saveenv option is not provided in SPL, but some boards need
 208           this support in 'Falcon' boot, where SPL need to boot from
 209           different images based on environment variable set by OS. For
 210           example OS may set "reboot_image" environment variable to
 211           "recovery" inorder to boot recovery image by SPL. The SPL read
 212           "reboot_image" and act accordingly and change the reboot_image
 213           to default mode using setenv and save the environemnt.
 214
 215 config SPL_ETH_SUPPORT
 216         bool "Support Ethernet"
 217         depends on SPL_ENV_SUPPORT
 218         help
 219           Enable access to the network subsystem and associated Ethernet
 220           drivers in SPL. This permits SPL to load U-Boot over an Ethernet
 221           link rather than from an on-board peripheral. Environment support
 222           is required since the network stack uses a number of environment
 223           variables. See also SPL_NET_SUPPORT.
 224
 225 config SPL_EXT_SUPPORT
 226         bool "Support EXT filesystems"
 227         depends on SPL
 228         help
 229           Enable support for EXT2/3/4 filesystems with SPL. This permits
 230           U-Boot (or Linux in Falcon mode) to be loaded from an EXT
 231           filesystem from within SPL. Support for the underlying block
 232           device (e.g. MMC or USB) must be enabled separately.
 233
 234 config SPL_FAT_SUPPORT
 235         bool "Support FAT filesystems"
 236         depends on SPL
 237         help
 238           Enable support for FAT and VFAT filesystems with SPL. This
 239           permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
 240           filesystem from within SPL. Support for the underlying block
 241           device (e.g. MMC or USB) must be enabled separately.
 242
 243 config SPL_FPGA_SUPPORT
 244         bool "Support FPGAs"
 245         depends on SPL
 246         help
 247           Enable support for FPGAs in SPL. Field-programmable Gate Arrays
 248           provide software-configurable hardware which is typically used to
 249           implement peripherals (such as UARTs, LCD displays, MMC) or
 250           accelerate custom processing functions, such as image processing
 251           or machine learning. Sometimes it is useful to program the FPGA
 252           as early as possible during boot, and this option can enable that
 253           within SPL.
 254
 255 config SPL_GPIO_SUPPORT
 256         bool "Support GPIO"
 257         depends on SPL
 258         help
 259           Enable support for GPIOs (General-purpose Input/Output) in SPL.
 260           GPIOs allow U-Boot to read the state of an input line (high or
 261           low) and set the state of an output line. This can be used to
 262           drive LEDs, control power to various system parts and read user
 263           input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
 264           for example. Enable this option to build the drivers in
 265           drivers/gpio as part of an SPL build.
 266
 267 config SPL_I2C_SUPPORT
 268         bool "Support I2C"
 269         depends on SPL
 270         help
 271           Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
 272           I2C works with a clock and data line which can be driven by a
 273           one or more masters or slaves. It is a fairly complex bus but is
 274           widely used as it only needs two lines for communication. Speeds of
 275           400kbps are typical but up to 3.4Mbps is supported by some
 276           hardware. I2C can be useful in SPL to configure power management
 277           ICs (PMICs) before raising the CPU clock speed, for example.
 278           Enable this option to build the drivers in drivers/i2c as part of
 279           an SPL build.
 280
 281 config SPL_LIBCOMMON_SUPPORT
 282         bool "Support common libraries"
 283         depends on SPL
 284         help
 285           Enable support for common U-Boot libraries within SPL. These
 286           libraries include common code to deal with U-Boot images,
 287           environment and USB, for example. This option is enabled on many
 288           boards. Enable this option to build the code in common/ as part of
 289           an SPL build.
 290
 291 config SPL_LIBDISK_SUPPORT
 292         bool "Support disk paritions"
 293         depends on SPL
 294         help
 295           Enable support for disk partitions within SPL. 'Disk' is something
 296           of a misnomer as it includes non-spinning media such as flash (as
 297           used in MMC and USB sticks). Partitions provide a way for a disk
 298           to be split up into separate regions, with a partition table placed
 299           at the start or end which describes the location and size of each
 300           'partition'. These partitions are typically uses as individual block
 301           devices, typically with an EXT2 or FAT filesystem in each. This
 302           option enables whatever partition support has been enabled in
 303           U-Boot to also be used in SPL. It brings in the code in disk/.
 304
 305 config SPL_LIBGENERIC_SUPPORT
 306         bool "Support generic libraries"
 307         depends on SPL
 308         help
 309           Enable support for generic U-Boot libraries within SPL. These
 310           libraries include generic code to deal with device tree, hashing,
 311           printf(), compression and the like. This option is enabled on many
 312           boards. Enable this option to build the code in lib/ as part of an
 313           SPL build.
 314
 315 config SPL_MMC_SUPPORT
 316         bool "Support MMC"
 317         depends on SPL
 318         help
 319           Enable support for MMC (Multimedia Card) within SPL. This enables
 320           the MMC protocol implementation and allows any enabled drivers to
 321           be used within SPL. MMC can be used with or without disk partition
 322           support depending on the application (SPL_LIBDISK_SUPPORT). Enable
 323           this option to build the drivers in drivers/mmc as part of an SPL
 324           build.
 325
 326 config SPL_MPC8XXX_INIT_DDR_SUPPORT
 327         bool "Support MPC8XXX DDR init"
 328         depends on SPL
 329         help
 330           Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
 331           random-access memory) on the MPC8XXX family within SPL. This
 332           allows DRAM to be set up before loading U-Boot into that DRAM,
 333           where it can run.
 334
 335 config SPL_MTD_SUPPORT
 336         bool "Support MTD drivers"
 337         depends on SPL
 338         help
 339           Enable support for MTD (Memory Technology Device) within SPL. MTD
 340           provides a block interface over raw NAND and can also be used with
 341           SPI flash. This allows SPL to load U-Boot from supported MTD
 342           devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
 343           to enable specific MTD drivers.
 344
 345 config SPL_MUSB_NEW_SUPPORT
 346         bool "Support new Mentor Graphics USB"
 347         depends on SPL
 348         help
 349           Enable support for Mentor Graphics USB in SPL. This is a new
 350           driver used by some boards. Enable this option to build
 351           the drivers in drivers/usb/musb-new as part of an SPL build. The
 352           old drivers are in drivers/usb/musb.
 353
 354 config SPL_NAND_SUPPORT
 355         bool "Support NAND flash"
 356         depends on SPL
 357         help
 358           Enable support for NAND (Negative AND) flash in SPL. NAND flash
 359           can be used to allow SPL to load U-Boot from supported devices.
 360           This enables the drivers in drivers/mtd/nand as part of an SPL
 361           build.
 362
 363 config SPL_NET_SUPPORT
 364         bool "Support networking"
 365         depends on SPL
 366         help
 367           Enable support for network devices (such as Ethernet) in SPL.
 368           This permits SPL to load U-Boot over a network link rather than
 369           from an on-board peripheral. Environment support is required since
 370           the network stack uses a number of environment variables. See also
 371           SPL_ETH_SUPPORT.
 372
 373 if SPL_NET_SUPPORT
 374 config SPL_NET_VCI_STRING
 375         string "BOOTP Vendor Class Identifier string sent by SPL"
 376         help
 377           As defined by RFC 2132 the vendor class identifier field can be
 378           sent by the client to identify the vendor type and configuration
 379           of a client.  This is often used in practice to allow for the DHCP
 380           server to specify different files to load depending on if the ROM,
 381           SPL or U-Boot itself makes the request
 382 endif   # if SPL_NET_SUPPORT
 383
 384 config SPL_NO_CPU_SUPPORT
 385         bool "Drop CPU code in SPL"
 386         depends on SPL
 387         help
 388           This is specific to the ARM926EJ-S CPU. It disables the standard
 389           start.S start-up code, presumably so that a replacement can be
 390           used on that CPU. You should not enable it unless you know what
 391           you are doing.
 392
 393 config SPL_NOR_SUPPORT
 394         bool "Support NOR flash"
 395         depends on SPL
 396         help
 397           Enable support for loading U-Boot from memory-mapped NOR (Negative
 398           OR) flash in SPL. NOR flash is slow to write but fast to read, and
 399           a memory-mapped device makes it very easy to access. Loading from
 400           NOR is typically achieved with just a memcpy().
 401
 402 config SPL_ONENAND_SUPPORT
 403         bool "Support OneNAND flash"
 404         depends on SPL
 405         help
 406           Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
 407           a type of NAND flash and therefore can be used to allow SPL to
 408           load U-Boot from supported devices. This enables the drivers in
 409           drivers/mtd/onenand as part of an SPL build.
 410
 411 config SPL_OS_BOOT
 412         bool "Activate Falcon Mode"
 413         depends on SPL && !TI_SECURE_DEVICE
 414         default n
 415         help
 416           Enable booting directly to an OS from SPL.
 417           for more info read doc/README.falcon
 418
 419 if SPL_OS_BOOT
 420 config SYS_OS_BASE
 421         hex "addr, where OS is found"
 422         depends on SPL && SPL_NOR_SUPPORT
 423         help
 424           Specify the address, where the OS image is found, which
 425           gets booted.
 426
 427 endif # SPL_OS_BOOT
 428
 429 config SPL_POST_MEM_SUPPORT
 430         bool "Support POST drivers"
 431         depends on SPL
 432         help
 433           Enable support for POST (Power-on Self Test) in SPL. POST is a
 434           procedure that checks that the hardware (CPU or board) appears to
 435           be functionally correctly. It is a sanity check that can be
 436           performed before booting. This enables the drivers in post/drivers
 437           as part of an SPL build.
 438
 439 config SPL_POWER_SUPPORT
 440         bool "Support power drivers"
 441         depends on SPL
 442         help
 443           Enable support for power control in SPL. This includes support
 444           for PMICs (Power-management Integrated Circuits) and some of the
 445           features provided by PMICs. In particular, voltage regulators can
 446           be used to enable/disable power and vary its voltage. That can be
 447           useful in SPL to turn on boot peripherals and adjust CPU voltage
 448           so that the clock speed can be increased. This enables the drivers
 449           in drivers/power, drivers/power/pmic and drivers/power/regulator
 450           as part of an SPL build.
 451
 452 config SPL_RAM_DEVICE
 453         bool "Support booting from preloaded image in RAM"
 454         depends on SPL
 455         default y if MICROBLAZE || ARCH_SOCFPGA || TEGRA || ARCH_ZYNQ
 456         help
 457           Enable booting of an image already loaded in RAM. The image has to
 458           be already in memory when SPL takes over, e.g. loaded by the boot
 459           ROM.
 460
 461 config SPL_SATA_SUPPORT
 462         bool "Support loading from SATA"
 463         depends on SPL
 464         help
 465           Enable support for SATA (Serial AT attachment) in SPL. This allows
 466           use of SATA devices such as hard drives and flash drivers for
 467           loading U-Boot. SATA is used in higher-end embedded systems and
 468           can provide higher performance than MMC , at somewhat higher
 469           expense and power consumption. This enables loading from SATA
 470           using a configured device.
 471
 472 config SPL_SERIAL_SUPPORT
 473         bool "Support serial"
 474         depends on SPL
 475         help
 476           Enable support for serial in SPL. This allows use of a serial UART
 477           for displaying messages while SPL is running. It also brings in
 478           printf() and panic() functions. This should normally be enabled
 479           unless there are space reasons not to. Even then, consider
 480           enabling USE_TINY_PRINTF which is a small printf() version.
 481
 482 config SPL_SPI_FLASH_SUPPORT
 483         bool "Support SPI flash drivers"
 484         depends on SPL
 485         help
 486           Enable support for using SPI flash in SPL, and loading U-Boot from
 487           SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
 488           the SPI bus that is used to connect it to a system. It is a simple
 489           but fast bidirectional 4-wire bus (clock, chip select and two data
 490           lines). This enables the drivers in drivers/mtd/spi as part of an
 491           SPL build. This normally requires SPL_SPI_SUPPORT.
 492
 493 config SPL_SPI_SUPPORT
 494         bool "Support SPI drivers"
 495         depends on SPL
 496         help
 497           Enable support for using SPI in SPL. This is used for connecting
 498           to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
 499           more details on that. The SPI driver provides the transport for
 500           data between the SPI flash and the CPU. This option can be used to
 501           enable SPI drivers that are needed for other purposes also, such
 502           as a SPI PMIC.
 503
 504 config SPL_USB_HOST_SUPPORT
 505         bool "Support USB host drivers"
 506         depends on SPL
 507         help
 508           Enable access to USB (Universal Serial Bus) host devices so that
 509           SPL can load U-Boot from a connected USB peripheral, such as a USB
 510           flash stick. While USB takes a little longer to start up than most
 511           buses, it is very flexible since many different types of storage
 512           device can be attached. This option enables the drivers in
 513           drivers/usb/host as part of an SPL build.
 514
 515 config SPL_USB_SUPPORT
 516         bool "Support loading from USB"
 517         depends on SPL_USB_HOST_SUPPORT
 518         help
 519           Enable support for USB devices in SPL. This allows use of USB
 520           devices such as hard drives and flash drivers for loading U-Boot.
 521           The actual drivers are enabled separately using the normal U-Boot
 522           config options. This enables loading from USB using a configured
 523           device.
 524
 525 config SPL_USB_GADGET_SUPPORT
 526         bool "Suppport USB Gadget drivers"
 527         depends on SPL
 528         help
 529           Enable USB Gadget API which allows to enable USB device functions
 530           in SPL.
 531
 532 if SPL_USB_GADGET_SUPPORT
 533
 534 config SPL_USBETH_SUPPORT
 535         bool "Support USB Ethernet drivers"
 536         help
 537           Enable access to the USB network subsystem and associated
 538           drivers in SPL. This permits SPL to load U-Boot over a
 539           USB-connected Ethernet link (such as a USB Ethernet dongle) rather
 540           than from an onboard peripheral. Environment support is required
 541           since the network stack uses a number of environment variables.
 542           See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
 543
 544 config SPL_DFU_SUPPORT
 545         bool "Support DFU (Device Firmware Upgarde)"
 546         select SPL_HASH_SUPPORT
 547         help
 548           This feature enables the DFU (Device Firmware Upgarde) in SPL with
 549           RAM memory device support. The ROM code will load and execute
 550           the SPL built with dfu. The user can load binaries (u-boot/kernel) to
 551           selected device partition from host-pc using dfu-utils.
 552           This feature is useful to flash the binaries to factory or bare-metal
 553           boards using USB interface.
 554
 555 choice
 556         bool "DFU device selection"
 557         depends on SPL_DFU_SUPPORT
 558
 559 config SPL_DFU_RAM
 560         bool "RAM device"
 561         depends on SPL_DFU_SUPPORT
 562         help
 563          select RAM/DDR memory device for loading binary images
 564          (u-boot/kernel) to the selected device partition using
 565          DFU and execute the u-boot/kernel from RAM.
 566
 567 endchoice
 568
 569 endif
 570
 571 config SPL_WATCHDOG_SUPPORT
 572         bool "Support watchdog drivers"
 573         depends on SPL
 574         help
 575           Enable support for watchdog drivers in SPL. A watchdog is
 576           typically a hardware peripheral which can reset the system when it
 577           detects no activity for a while (such as a software crash). This
 578           enables the drivers in drivers/watchdog as part of an SPL build.
 579
 580 config SPL_YMODEM_SUPPORT
 581         bool "Support loading using Ymodem"
 582         depends on SPL
 583         help
 584           While loading from serial is slow it can be a useful backup when
 585           there is no other option. The Ymodem protocol provides a reliable
 586           means of transmitting U-Boot over a serial line for using in SPL,
 587           with a checksum to ensure correctness.
 588
 589 config TPL_ENV_SUPPORT
 590         bool "Support an environment"
 591         depends on TPL
 592         help
 593           Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
 594
 595 config TPL_I2C_SUPPORT
 596         bool "Support I2C"
 597         depends on TPL
 598         help
 599           Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
 600           details.
 601
 602 config TPL_LIBCOMMON_SUPPORT
 603         bool "Support common libraries"
 604         depends on TPL
 605         help
 606           Enable support for common U-Boot libraries within TPL. See
 607           SPL_LIBCOMMON_SUPPORT for details.
 608
 609 config TPL_LIBGENERIC_SUPPORT
 610         bool "Support generic libraries"
 611         depends on TPL
 612         help
 613           Enable support for generic U-Boot libraries within TPL. See
 614           SPL_LIBGENERIC_SUPPORT for details.
 615
 616 config TPL_MPC8XXX_INIT_DDR_SUPPORT
 617         bool "Support MPC8XXX DDR init"
 618         depends on TPL
 619         help
 620           Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
 621           SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
 622
 623 config TPL_MMC_SUPPORT
 624         bool "Support MMC"
 625         depends on TPL
 626         help
 627           Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
 628
 629 config TPL_NAND_SUPPORT
 630         bool "Support NAND flash"
 631         depends on TPL
 632         help
 633           Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
 634
 635 config TPL_SERIAL_SUPPORT
 636         bool "Support serial"
 637         depends on TPL
 638         help
 639           Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
 640           details.
 641
 642 config TPL_SPI_FLASH_SUPPORT
 643         bool "Support SPI flash drivers"
 644         depends on TPL
 645         help
 646           Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
 647           for details.
 648
 649 config TPL_SPI_SUPPORT
 650         bool "Support SPI drivers"
 651         depends on TPL
 652         help
 653           Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for
 654           details.
 655
 656 endmenu