+menu "SPL / TPL"
+
config SUPPORT_SPL
bool
prompt "Enable TPL"
help
If you want to build TPL as well as the normal image and SPL, say Y.
+
+config SPL_CRC32_SUPPORT
+ bool "Support CRC32"
+ depends on SPL_FIT
+ help
+ Enable this to support CRC32 in FIT images within SPL. This is a
+ 32-bit checksum value that can be used to verify images. This is
+ the least secure type of checksum, suitable for detected
+ accidental image corruption. For secure applications you should
+ consider SHA1 or SHA256.
+
+config SPL_MD5_SUPPORT
+ bool "Support MD5"
+ depends on SPL_FIT
+ help
+ Enable this to support MD5 in FIT images within SPL. An MD5
+ checksum is a 128-bit hash value used to check that the image
+ contents have not been corrupted. Note that MD5 is not considered
+ secure as it is possible (with a brute-force attack) to adjust the
+ image while still retaining the same MD5 hash value. For secure
+ applications where images may be changed maliciously, you should
+ consider SHA1 or SHA256.
+
+config SPL_SHA1_SUPPORT
+ bool "Support SHA1"
+ depends on SPL_FIT
+ help
+ Enable this to support SHA1 in FIT images within SPL. A SHA1
+ checksum is a 160-bit (20-byte) hash value used to check that the
+ image contents have not been corrupted or maliciously altered.
+ While SHA1 is fairly secure it is coming to the end of its life
+ due to the expanding computing power avaiable to brute-force
+ attacks. For more security, consider SHA256.
+
+config SPL_SHA256_SUPPORT
+ bool "Support SHA256"
+ depends on SPL_FIT
+ help
+ Enable this to support SHA256 in FIT images within SPL. A SHA256
+ checksum is a 256-bit (32-byte) hash value used to check that the
+ image contents have not been corrupted. SHA256 is recommended for
+ use in secure applications since (as at 2016) there is no known
+ feasible attack that could produce a 'collision' with differing
+ input data. Use this for the highest security. Note that only the
+ SHA256 variant is supported: SHA512 and others are not currently
+ supported in U-Boot.
+
+config SPL_CRYPTO_SUPPORT
+ bool "Support crypto drivers"
+ depends on SPL
+ help
+ Enable crypto drivers in SPL. These drivers can be used to
+ accelerate secure boot processing in secure applications. Enable
+ this option to build the drivers in drivers/crypto as part of an
+ SPL build.
+
+config SPL_HASH_SUPPORT
+ bool "Support hashing drivers"
+ depends on SPL
+ help
+ Enable hashing drivers in SPL. These drivers can be used to
+ accelerate secure boot processing in secure applications. Enable
+ this option to build system-specific drivers for hash acceleration
+ as part of an SPL build.
+
+config SPL_DMA_SUPPORT
+ bool "Support DMA drivers"
+ depends on SPL
+ help
+ Enable DMA (direct-memory-access) drivers in SPL. These drivers
+ can be used to handle memory-to-peripheral data transfer without
+ the CPU moving the data. Enable this option to build the drivers
+ in drivers/dma as part of an SPL build.
+
+config SPL_DRIVERS_MISC_SUPPORT
+ bool "Support misc drivers"
+ depends on SPL
+ help
+ Enable miscellaneous drivers in SPL. These drivers perform various
+ tasks that don't fall nicely into other categories, Enable this
+ option to build the drivers in drivers/misc as part of an SPL
+ build, for those that support building in SPL (not all drivers do).
+
+config SPL_ENV_SUPPORT
+ bool "Support an environment"
+ depends on SPL
+ help
+ Enable environment support in SPL. The U-Boot environment provides
+ a number of settings (essentially name/value pairs) which can
+ control many aspects of U-Boot's operation. Normally this is not
+ needed in SPL as it has a much simpler task with less
+ configuration. But some boards use this to support 'Falcon' boot
+ on EXT2 and FAT, where SPL boots directly into Linux without
+ starting U-Boot first. Enabling this option will make getenv()
+ and setenv() available in SPL.
+
+config SPL_ETH_SUPPORT
+ bool "Support Ethernet"
+ depends on SPL_ENV_SUPPORT
+ help
+ Enable access to the network subsystem and associated Ethernet
+ drivers in SPL. This permits SPL to load U-Boot over an Ethernet
+ link rather than from an on-board peripheral. Environment support
+ is required since the network stack uses a number of environment
+ variables. See also SPL_NET_SUPPORT.
+
+config SPL_EXT_SUPPORT
+ bool "Support EXT filesystems"
+ depends on SPL
+ help
+ Enable support for EXT2/3/4 filesystems with SPL. This permits
+ U-Boot (or Linux in Falcon mode) to be loaded from an EXT
+ filesystem from within SPL. Support for the underlying block
+ device (e.g. MMC or USB) must be enabled separately.
+
+config SPL_FAT_SUPPORT
+ bool "Support FAT filesystems"
+ depends on SPL
+ help
+ Enable support for FAT and VFAT filesystems with SPL. This
+ permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
+ filesystem from within SPL. Support for the underlying block
+ device (e.g. MMC or USB) must be enabled separately.
+
+config SPL_FPGA_SUPPORT
+ bool "Support FPGAs"
+ depends on SPL
+ help
+ Enable support for FPGAs in SPL. Field-programmable Gate Arrays
+ provide software-configurable hardware which is typically used to
+ implement peripherals (such as UARTs, LCD displays, MMC) or
+ accelerate custom processing functions, such as image processing
+ or machine learning. Sometimes it is useful to program the FPGA
+ as early as possible during boot, and this option can enable that
+ within SPL.
+
+config SPL_GPIO_SUPPORT
+ bool "Support GPIO"
+ depends on SPL
+ help
+ Enable support for GPIOs (General-purpose Input/Output) in SPL.
+ GPIOs allow U-Boot to read the state of an input line (high or
+ low) and set the state of an output line. This can be used to
+ drive LEDs, control power to various system parts and read user
+ input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
+ for example. Enable this option to build the drivers in
+ drivers/gpio as part of an SPL build.
+
+config SPL_I2C_SUPPORT
+ bool "Support I2C"
+ depends on SPL
+ help
+ Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
+ I2C works with a clock and data line which can be driven by a
+ one or more masters or slaves. It is a fairly complex bus but is
+ widely used as it only needs two lines for communication. Speeds of
+ 400kbps are typical but up to 3.4Mbps is supported by some
+ hardware. I2C can be useful in SPL to configure power management
+ ICs (PMICs) before raising the CPU clock speed, for example.
+ Enable this option to build the drivers in drivers/i2c as part of
+ an SPL build.
+
+config SPL_LIBCOMMON_SUPPORT
+ bool "Support common libraries"
+ depends on SPL
+ help
+ Enable support for common U-Boot libraries within SPL. These
+ libraries include common code to deal with U-Boot images,
+ environment and USB, for example. This option is enabled on many
+ boards. Enable this option to build the code in common/ as part of
+ an SPL build.
+
+config SPL_LIBDISK_SUPPORT
+ bool "Support disk paritions"
+ depends on SPL
+ help
+ Enable support for disk partitions within SPL. 'Disk' is something
+ of a misnomer as it includes non-spinning media such as flash (as
+ used in MMC and USB sticks). Partitions provide a way for a disk
+ to be split up into separate regions, with a partition table placed
+ at the start or end which describes the location and size of each
+ 'partition'. These partitions are typically uses as individual block
+ devices, typically with an EXT2 or FAT filesystem in each. This
+ option enables whatever partition support has been enabled in
+ U-Boot to also be used in SPL. It brings in the code in disk/.
+
+config SPL_LIBGENERIC_SUPPORT
+ bool "Support generic libraries"
+ depends on SPL
+ help
+ Enable support for generic U-Boot libraries within SPL. These
+ libraries include generic code to deal with device tree, hashing,
+ printf(), compression and the like. This option is enabled on many
+ boards. Enable this option to build the code in lib/ as part of an
+ SPL build.
+
+config SPL_MMC_SUPPORT
+ bool "Support MMC"
+ depends on SPL
+ help
+ Enable support for MMC (Multimedia Card) within SPL. This enables
+ the MMC protocol implementation and allows any enabled drivers to
+ be used within SPL. MMC can be used with or without disk partition
+ support depending on the application (SPL_LIBDISK_SUPPORT). Enable
+ this option to build the drivers in drivers/mmc as part of an SPL
+ build.
+
+config SPL_MPC8XXX_INIT_DDR_SUPPORT
+ bool "Support MPC8XXX DDR init"
+ depends on SPL
+ help
+ Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
+ random-access memory) on the MPC8XXX family within SPL. This
+ allows DRAM to be set up before loading U-Boot into that DRAM,
+ where it can run.
+
+config SPL_MTD_SUPPORT
+ bool "Support MTD drivers"
+ depends on SPL
+ help
+ Enable support for MTD (Memory Technology Device) within SPL. MTD
+ provides a block interface over raw NAND and can also be used with
+ SPI flash. This allows SPL to load U-Boot from supported MTD
+ devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
+ to enable specific MTD drivers.
+
+config SPL_MUSB_NEW_SUPPORT
+ bool "Support new Mentor Graphics USB"
+ depends on SPL
+ help
+ Enable support for Mentor Graphics USB in SPL. This is a new
+ driver used by some boards. Enable this option to build
+ the drivers in drivers/usb/musb-new as part of an SPL build. The
+ old drivers are in drivers/usb/musb.
+
+config SPL_NAND_SUPPORT
+ bool "Support NAND flash"
+ depends on SPL
+ help
+ Enable support for NAND (Negative AND) flash in SPL. NAND flash
+ can be used to allow SPL to load U-Boot from supported devices.
+ This enables the drivers in drivers/mtd/nand as part of an SPL
+ build.
+
+config SPL_NET_SUPPORT
+ bool "Support networking"
+ depends on SPL
+ help
+ Enable support for network devices (such as Ethernet) in SPL.
+ This permits SPL to load U-Boot over a network link rather than
+ from an on-board peripheral. Environment support is required since
+ the network stack uses a number of environment variables. See also
+ SPL_ETH_SUPPORT.
+
+if SPL_NET_SUPPORT
+config SPL_NET_VCI_STRING
+ string "BOOTP Vendor Class Identifier string sent by SPL"
+ help
+ As defined by RFC 2132 the vendor class identifier field can be
+ sent by the client to identify the vendor type and configuration
+ of a client. This is often used in practice to allow for the DHCP
+ server to specify different files to load depending on if the ROM,
+ SPL or U-Boot itself makes the request
+endif # if SPL_NET_SUPPORT
+
+config SPL_NO_CPU_SUPPORT
+ bool "Drop CPU code in SPL"
+ depends on SPL
+ help
+ This is specific to the ARM926EJ-S CPU. It disables the standard
+ start.S start-up code, presumably so that a replacement can be
+ used on that CPU. You should not enable it unless you know what
+ you are doing.
+
+config SPL_NOR_SUPPORT
+ bool "Support NOR flash"
+ depends on SPL
+ help
+ Enable support for loading U-Boot from memory-mapped NOR (Negative
+ OR) flash in SPL. NOR flash is slow to write but fast to read, and
+ a memory-mapped device makes it very easy to access. Loading from
+ NOR is typically achieved with just a memcpy().
+
+config SPL_ONENAND_SUPPORT
+ bool "Support OneNAND flash"
+ depends on SPL
+ help
+ Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
+ a type of NAND flash and therefore can be used to allow SPL to
+ load U-Boot from supported devices. This enables the drivers in
+ drivers/mtd/onenand as part of an SPL build.
+
+config SPL_POST_MEM_SUPPORT
+ bool "Support POST drivers"
+ depends on SPL
+ help
+ Enable support for POST (Power-on Self Test) in SPL. POST is a
+ procedure that checks that the hardware (CPU or board) appears to
+ be functionally correctly. It is a sanity check that can be
+ performed before booting. This enables the drivers in post/drivers
+ as part of an SPL build.
+
+config SPL_POWER_SUPPORT
+ bool "Support power drivers"
+ depends on SPL
+ help
+ Enable support for power control in SPL. This includes support
+ for PMICs (Power-management Integrated Circuits) and some of the
+ features provided by PMICs. In particular, voltage regulators can
+ be used to enable/disable power and vary its voltage. That can be
+ useful in SPL to turn on boot peripherals and adjust CPU voltage
+ so that the clock speed can be increased. This enables the drivers
+ in drivers/power, drivers/power/pmic and drivers/power/regulator
+ as part of an SPL build.
+
+config SPL_SATA_SUPPORT
+ bool "Support loading from SATA"
+ depends on SPL
+ help
+ Enable support for SATA (Serial AT attachment) in SPL. This allows
+ use of SATA devices such as hard drives and flash drivers for
+ loading U-Boot. SATA is used in higher-end embedded systems and
+ can provide higher performance than MMC , at somewhat higher
+ expense and power consumption. This enables loading from SATA
+ using a configured device.
+
+config SPL_SERIAL_SUPPORT
+ bool "Support serial"
+ depends on SPL
+ help
+ Enable support for serial in SPL. This allows use of a serial UART
+ for displaying messages while SPL is running. It also brings in
+ printf() and panic() functions. This should normally be enabled
+ unless there are space reasons not to. Even then, consider
+ enabling USE_TINY_PRINTF which is a small printf() version.
+
+config SPL_SPI_FLASH_SUPPORT
+ bool "Support SPI flash drivers"
+ depends on SPL
+ help
+ Enable support for using SPI flash in SPL, and loading U-Boot from
+ SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
+ the SPI bus that is used to connect it to a system. It is a simple
+ but fast bidirectional 4-wire bus (clock, chip select and two data
+ lines). This enables the drivers in drivers/mtd/spi as part of an
+ SPL build. This normally requires SPL_SPI_SUPPORT.
+
+config SPL_SPI_SUPPORT
+ bool "Support SPI drivers"
+ depends on SPL
+ help
+ Enable support for using SPI in SPL. This is used for connecting
+ to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
+ more details on that. The SPI driver provides the transport for
+ data between the SPI flash and the CPU. This option can be used to
+ enable SPI drivers that are needed for other purposes also, such
+ as a SPI PMIC.
+
+config SPL_USBETH_SUPPORT
+ bool "Support USB Ethernet drivers"
+ depends on SPL
+ help
+ Enable access to the USB network subsystem and associated
+ drivers in SPL. This permits SPL to load U-Boot over a
+ USB-connected Ethernet link (such as a USB Ethernet dongle) rather
+ than from an onboard peripheral. Environment support is required
+ since the network stack uses a number of environment variables.
+ See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
+
+config SPL_USB_HOST_SUPPORT
+ bool "Support USB host drivers"
+ depends on SPL
+ help
+ Enable access to USB (Universal Serial Bus) host devices so that
+ SPL can load U-Boot from a connected USB peripheral, such as a USB
+ flash stick. While USB takes a little longer to start up than most
+ buses, it is very flexible since many different types of storage
+ device can be attached. This option enables the drivers in
+ drivers/usb/host as part of an SPL build.
+
+config SPL_USB_SUPPORT
+ bool "Support loading from USB"
+ depends on SPL_USB_HOST_SUPPORT
+ help
+ Enable support for USB devices in SPL. This allows use of USB
+ devices such as hard drives and flash drivers for loading U-Boot.
+ The actual drivers are enabled separately using the normal U-Boot
+ config options. This enables loading from USB using a configured
+ device.
+
+config SPL_WATCHDOG_SUPPORT
+ bool "Support watchdog drivers"
+ depends on SPL
+ help
+ Enable support for watchdog drivers in SPL. A watchdog is
+ typically a hardware peripheral which can reset the system when it
+ detects no activity for a while (such as a software crash). This
+ enables the drivers in drivers/watchdog as part of an SPL build.
+
+config SPL_YMODEM_SUPPORT
+ bool "Support loading using Ymodem"
+ depends on SPL
+ help
+ While loading from serial is slow it can be a useful backup when
+ there is no other option. The Ymodem protocol provides a reliable
+ means of transmitting U-Boot over a serial line for using in SPL,
+ with a checksum to ensure correctness.
+
+endmenu
projects / u-boot / commitdiff