Software Configuration:
=======================
-Configuration is usually done using C preprocessor defines; the
-rationale behind that is to avoid dead code whenever possible.
-
-There are two classes of configuration variables:
-
-* Configuration _OPTIONS_:
- These are selectable by the user and have names beginning with
- "CONFIG_".
-
-* Configuration _SETTINGS_:
- These depend on the hardware etc. and should not be meddled with if
- you don't know what you're doing; they have names beginning with
- "CONFIG_SYS_".
-
-Previously, all configuration was done by hand, which involved creating
-symbolic links and editing configuration files manually. More recently,
-U-Boot has added the Kbuild infrastructure used by the Linux kernel,
-allowing you to use the "make menuconfig" command to configure your
-build.
-
-
Selection of Processor Architecture and Board Type:
---------------------------------------------------
Board config to use DDR3L. It can be enabled for SoCs with
DDR3L controllers.
- CONFIG_SYS_FSL_IFC_BE
- Defines the IFC controller register space as Big Endian
-
- CONFIG_SYS_FSL_IFC_LE
- Defines the IFC controller register space as Little Endian
-
CONFIG_SYS_FSL_IFC_CLK_DIV
Defines divider of platform clock(clock input to IFC controller).
same as CONFIG_SYS_DDR_SDRAM_BASE for all Power SoCs. But
it could be different for ARM SoCs.
- CONFIG_SYS_FSL_DDR_INTLV_256B
- DDR controller interleaving on 256-byte. This is a special
- interleaving mode, handled by Dickens for Freescale layerscape
- SoCs with ARM core.
-
CONFIG_SYS_FSL_DDR_MAIN_NUM_CTRLS
Number of controllers used as main memory.
Enables support for FPGA family.
(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
- CONFIG_SYS_FPGA_PROG_FEEDBACK
-
- Enable printing of hash marks during FPGA configuration.
-
CONFIG_SYS_FPGA_CHECK_BUSY
Enable checks on FPGA configuration interface busy
If defined, a function that provides delays in the FPGA
configuration driver.
- CONFIG_SYS_FPGA_CHECK_CTRLC
- Allow Control-C to interrupt FPGA configuration
-
CONFIG_SYS_FPGA_CHECK_ERROR
Check for configuration errors during FPGA bitfile
Enables allocating and saving a kernel copy of the bd_info in
space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
-- CONFIG_SYS_MAX_FLASH_SECT:
- Max number of sectors on a Flash chip
-
-- CONFIG_SYS_FLASH_ERASE_TOUT:
- Timeout for Flash erase operations (in ms)
-
-- CONFIG_SYS_FLASH_WRITE_TOUT:
- Timeout for Flash write operations (in ms)
-
-- CONFIG_SYS_FLASH_LOCK_TOUT
- Timeout for Flash set sector lock bit operation (in ms)
-
-- CONFIG_SYS_FLASH_UNLOCK_TOUT
- Timeout for Flash clear lock bits operation (in ms)
-
- CONFIG_SYS_FLASH_PROTECTION
If defined, hardware flash sectors protection is used
instead of U-Boot software protection.
-- CONFIG_SYS_DIRECT_FLASH_TFTP:
-
- Enable TFTP transfers directly to flash memory;
- without this option such a download has to be
- performed in two steps: (1) download to RAM, and (2)
- copy from RAM to flash.
-
- The two-step approach is usually more reliable, since
- you can check if the download worked before you erase
- the flash, but in some situations (when system RAM is
- too limited to allow for a temporary copy of the
- downloaded image) this option may be very useful.
-
- CONFIG_SYS_FLASH_CFI:
Define if the flash driver uses extra elements in the
common flash structure for storing flash geometry.
s29ws-n MirrorBit flash has non-standard addresses for buffered
write commands.
-- CONFIG_SYS_FLASH_QUIET_TEST
- If this option is defined, the common CFI flash doesn't
- print it's warning upon not recognized FLASH banks. This
- is useful, if some of the configured banks are only
- optionally available.
-
- CONFIG_FLASH_SHOW_PROGRESS
If defined (must be an integer), print out countdown
digits and dots. Recommended value: 45 (9..1) for 80
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