Merge branch 'u-boot-imx/master' into 'u-boot-arm/master'

[platform/kernel/u-boot.git] / README

diff --git a/README b/README
index bdce275..a35ef31 100644 (file)
--- a/README
+++ b/README
@@ -485,6 +485,17 @@ The following options need to be configured:
                Thumb2 this flag will result in Thumb2 code generated by
                GCC.
 
+               CONFIG_ARM_ERRATA_716044
+               CONFIG_ARM_ERRATA_742230
+               CONFIG_ARM_ERRATA_743622
+               CONFIG_ARM_ERRATA_751472
+
+               If set, the workarounds for these ARM errata are applied early
+               during U-Boot startup. Note that these options force the
+               workarounds to be applied; no CPU-type/version detection
+               exists, unlike the similar options in the Linux kernel. Do not
+               set these options unless they apply!
+
 - Linux Kernel Interface:
                CONFIG_CLOCKS_IN_MHZ
 
@@ -1533,6 +1544,17 @@ CBFS (Coreboot Filesystem) support
                allows for a "silent" boot where a splash screen is
                loaded very quickly after power-on.
 
+               CONFIG_SPLASHIMAGE_GUARD
+
+               If this option is set, then U-Boot will prevent the environment
+               variable "splashimage" from being set to a problematic address
+               (see README.displaying-bmps and README.arm-unaligned-accesses).
+               This option is useful for targets where, due to alignment
+               restrictions, an improperly aligned BMP image will cause a data
+               abort. If you think you will not have problems with unaligned
+               accesses (for example because your toolchain prevents them)
+               there is no need to set this option.
+
                CONFIG_SPLASH_SCREEN_ALIGN
 
                If this option is set the splash image can be freely positioned
@@ -1553,6 +1575,14 @@ CBFS (Coreboot Filesystem) support
                        => vertically centered image
                           at x = dspWidth - bmpWidth - 9
 
+               CONFIG_SPLASH_SCREEN_PREPARE
+
+               If this option is set then the board_splash_screen_prepare()
+               function, which must be defined in your code, is called as part
+               of the splash screen display sequence. It gives the board an
+               opportunity to prepare the splash image data before it is
+               processed and sent to the frame buffer by U-Boot.
+
 - Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
 
                If this option is set, additionally to standard BMP
@@ -3222,6 +3252,13 @@ Configuration Settings:
        its config.mk file). If you find problems enabling this option on
        your board please report the problem and send patches!
 
+- CONFIG_SYS_SYM_OFFSETS
+       This is set by architectures that use offsets for link symbols
+       instead of absolute values. So bss_start is obtained using an
+       offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
+       directly. You should not need to touch this setting.
+
+
 The following definitions that deal with the placement and management
 of environment data (variable area); in general, we support the
 following configurations:
@@ -3842,6 +3879,10 @@ Low Level (hardware related) configuration options:
                If defined, the x86 reset vector code is included. This is not
                needed when U-Boot is running from Coreboot.
 
+- CONFIG_SYS_MPUCLK
+               Defines the MPU clock speed (in MHz).
+
+               NOTE : currently only supported on AM335x platforms.
 
 Freescale QE/FMAN Firmware Support:
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