POST: make env test flags fetching optional

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

diff --git a/README b/README
index a43da97..dfc7ada 100644 (file)
--- a/README
+++ b/README
@@ -619,6 +619,20 @@ The following options need to be configured:
                must be defined, to setup the maximum idle timeout for
                the SMC.
 
+- Pre-Console Buffer:
+                Prior to the console being initialised (i.e. serial UART
+                initialised etc) all console output is silently discarded.
+                Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
+                buffer any console messages prior to the console being
+                initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
+                bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
+                a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
+                bytes are output before the console is  initialised, the
+                earlier bytes are discarded.
+
+                'Sane' compilers will generate smaller code if
+                CONFIG_PRE_CON_BUF_SZ is a power of 2
+
 - Boot Delay:  CONFIG_BOOTDELAY - in seconds
                Delay before automatically booting the default image;
                set to -1 to disable autoboot.
@@ -2862,6 +2876,43 @@ Low Level (hardware related) configuration options:
                and RPXsuper) to be able to adjust the position of
                the IMMR register after a reset.
 
+- CONFIG_SYS_CCSRBAR_DEFAULT:
+               Default (power-on reset) physical address of CCSR on Freescale
+               PowerPC SOCs.
+
+- CONFIG_SYS_CCSRBAR:
+               Virtual address of CCSR.  On a 32-bit build, this is typically
+               the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
+
+               CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
+               for cross-platform code that uses that macro instead.
+
+- CONFIG_SYS_CCSRBAR_PHYS:
+               Physical address of CCSR.  CCSR can be relocated to a new
+               physical address, if desired.  In this case, this macro should
+               be set to that address.  Otherwise, it should be set to the
+               same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
+               is typically relocated on 36-bit builds.  It is recommended
+               that this macro be defined via the _HIGH and _LOW macros:
+
+               #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
+                       * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
+
+- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
+               Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.  This value is typically
+               either 0 (32-bit build) or 0xF (36-bit build).  This macro is
+               used in assembly code, so it must not contain typecasts or
+               integer size suffixes (e.g. "ULL").
+
+- CONFIG_SYS_CCSRBAR_PHYS_LOW:
+               Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
+               used in assembly code, so it must not contain typecasts or
+               integer size suffixes (e.g. "ULL").
+
+- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
+               If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
+               forced to a value that ensures that CCSR is not relocated.
+
 - Floppy Disk Support:
                CONFIG_SYS_FDC_DRIVE_NUMBER