boards with QUICC Engines require OF_QE to set UCC MAC
addresses
- CONFIG_OF_BOARD_SETUP
-
- Board code has addition modification that it wants to make
- to the flat device tree before handing it off to the kernel
-
CONFIG_OF_SYSTEM_SETUP
Other code has addition modification that it wants to make
Note: If a "bootargs" environment is defined, it will override
the defaults discussed just above.
-- Cache Configuration:
- CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
-
- Cache Configuration for ARM:
CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
controller
Define this variable to enable hw flow control in serial driver.
Current user of this option is drivers/serial/nsl16550.c driver
-- Autoboot Command:
- CONFIG_BOOTCOMMAND
- Only needed when CONFIG_BOOTDELAY is enabled;
- define a command string that is automatically executed
- when no character is read on the console interface
- within "Boot Delay" after reset.
-
- CONFIG_RAMBOOT and CONFIG_NFSBOOT
- The value of these goes into the environment as
- "ramboot" and "nfsboot" respectively, and can be used
- as a convenience, when switching between booting from
- RAM and NFS.
-
- Serial Download Echo Mode:
CONFIG_LOADS_ECHO
If defined to 1, all characters received during a
which adds regex support to some commands, as for
example "env grep" and "setexpr".
-- Device tree:
- CONFIG_OF_CONTROL
- If this variable is defined, U-Boot will use a device tree
- to configure its devices, instead of relying on statically
- compiled #defines in the board file. This option is
- experimental and only available on a few boards. The device
- tree is available in the global data as gd->fdt_blob.
-
- U-Boot needs to get its device tree from somewhere. This can
- be done using one of the three options below:
-
- CONFIG_OF_SEPARATE
- If this variable is defined, U-Boot will build a device tree
- binary. It will be called u-boot.dtb. Architecture-specific
- code will locate it at run-time. Generally this works by:
-
- cat u-boot.bin u-boot.dtb >image.bin
-
- and in fact, U-Boot does this for you, creating a file called
- u-boot-dtb.bin which is useful in the common case. You can
- still use the individual files if you need something more
- exotic.
-
- CONFIG_OF_BOARD
- If this variable is defined, U-Boot will use the device tree
- provided by the board at runtime instead of embedding one with
- the image. Only boards defining board_fdt_blob_setup() support
- this option (see include/fdtdec.h file).
-
- Watchdog:
- CONFIG_WATCHDOG
- If this variable is defined, it enables watchdog
- support for the SoC. There must be support in the SoC
- specific code for a watchdog. For the 8xx
- CPUs, the SIU Watchdog feature is enabled in the SYPCR
- register. When supported for a specific SoC is
- available, then no further board specific code should
- be needed to use it.
-
- CONFIG_HW_WATCHDOG
- When using a watchdog circuitry external to the used
- SoC, then define this variable and provide board
- specific code for the "hw_watchdog_reset" function.
-
CONFIG_SYS_WATCHDOG_FREQ
Some platforms automatically call WATCHDOG_RESET()
from the timer interrupt handler every
least one non-MTD partition type as well.
- IDE Reset method:
- CONFIG_IDE_RESET_ROUTINE - this is defined in several
- board configurations files but used nowhere!
-
CONFIG_IDE_RESET - is this is defined, IDE Reset will
be performed by calling the function
ide_set_reset(int reset)
sending again an USB request to the device.
- Journaling Flash filesystem support:
- CONFIG_JFFS2_NAND
- Define these for a default partition on a NAND device
-
CONFIG_SYS_JFFS2_FIRST_SECTOR,
CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
Define these for a default partition on a NOR device
- Keyboard Support:
See Kconfig help for available keyboard drivers.
- CONFIG_KEYBOARD
-
- Define this to enable a custom keyboard support.
- This simply calls drv_keyboard_init() which must be
- defined in your board-specific files. This option is deprecated
- and is only used by novena. For new boards, use driver model
- instead.
-
- Video support:
CONFIG_FSL_DIU_FB
Enable the Freescale DIU video driver. Reference boards for
CONFIG_CFB_CONSOLE
CONFIG_VIDEO_SW_CURSOR
CONFIG_VGA_AS_SINGLE_DEVICE
- CONFIG_VIDEO_LOGO
CONFIG_VIDEO_BMP_LOGO
The DIU driver will look for the 'video-mode' environment
SPI EEPROM, also an instance works with Crystal A/D and
D/As on the SACSng board)
- CONFIG_SOFT_SPI
-
- Enables a software (bit-bang) SPI driver rather than
- using hardware support. This is a general purpose
- driver that only requires three general I/O port pins
- (two outputs, one input) to function. If this is
- defined, the board configuration must define several
- SPI configuration items (port pins to use, etc). For
- an example, see include/configs/sacsng.h.
-
CONFIG_SYS_SPI_MXC_WAIT
Timeout for waiting until spi transfer completed.
default: (CONFIG_SYS_HZ/100) /* 10 ms */
Time to wait after FPGA configuration. The default is
200 ms.
-- Configuration Management:
-
- CONFIG_IDENT_STRING
-
- If defined, this string will be added to the U-Boot
- version information (U_BOOT_VERSION)
-
- Vendor Parameter Protection:
U-Boot considers the values of the environment
HERMES, IP860, RPXlite, LWMON,
FLAGADM
-- Access to physical memory region (> 4GB)
- Some basic support is provided for operations on memory not
- normally accessible to U-Boot - e.g. some architectures
- support access to more than 4GB of memory on 32-bit
- machines using physical address extension or similar.
- Define CONFIG_PHYSMEM to access this basic support, which
- currently only supports clearing the memory.
-
- Error Recovery:
CONFIG_NET_RETRY_COUNT
CONFIG_SPL_INIT_MINIMAL
Arch init code should be built for a very small image
- CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION
- Partition on the MMC to load U-Boot from when the MMC is being
- used in raw mode
-
CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
Sector to load kernel uImage from when MMC is being
used in raw mode (for Falcon mode)
- CONFIG_SYS_MAMR_PTA:
periodic timer for refresh
-- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
- CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
- CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
- CONFIG_SYS_BR1_PRELIM:
- Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
-
-- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
- CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
- CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
- Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
-
- CONFIG_SYS_SRIO:
Chip has SRIO or not
* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
- Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
- INTEGRITY).
+ Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, INTEGRITY).
* Target CPU Architecture (Provisions for Alpha, ARM, Intel x86,
IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Currently supported: ARM, Intel x86, MIPS, NDS32, Nios II, PowerPC).