m68k: cache: add an empty stub functions for invalidate/flush dcache

[karo-tx-uboot.git] / doc / README.falcon

diff --git a/doc/README.falcon b/doc/README.falcon
index 93e855d20eac55a4779c583f7da68c3299c11055..e9f8a7583c721cd96eb364ff23d591c0284c70b3 100644 (file)
--- a/doc/README.falcon
+++ b/doc/README.falcon
@@ -31,9 +31,10 @@ informed to load it before running the kernel.
 To boot the kernel, these steps under a Falcon-aware U-Boot are required:
 
 1. Boot the board into U-Boot.
 To boot the kernel, these steps under a Falcon-aware U-Boot are required:
 
 1. Boot the board into U-Boot.

-Use the "spl export" command to generate the kernel parameters area or the DT.
-U-Boot runs as when it boots the kernel, but stops before passing the control
-to the kernel.
+After loading the desired legacy-format kernel image into memory (and DT as
+well, if used), use the "spl export" command to generate the kernel parameters
+area or the DT.  U-Boot runs as when it boots the kernel, but stops before
+passing the control to the kernel.

 
 2. Save the prepared snapshot into persistent media.
 The address where to save it must be configured into board configuration
 
 2. Save the prepared snapshot into persistent media.
 The address where to save it must be configured into board configuration


@@ -41,6 +42,8 @@ file (CONFIG_CMD_SPL_NAND_OFS for NAND).
 
 3. Boot the board into Falcon Mode. SPL will load the kernel and copy
 the parameters which are saved in the persistent area to the required address.
 
 3. Boot the board into Falcon Mode. SPL will load the kernel and copy
 the parameters which are saved in the persistent area to the required address.

+If a valid uImage is not found at the defined location, U-Boot will be
+booted instead.

 
 It is required to implement a custom mechanism to select if SPL loads U-Boot
 or another image.
 
 It is required to implement a custom mechanism to select if SPL loads U-Boot
 or another image.


@@ -78,6 +81,19 @@ spl_start_uboot() : required
                Returns "0" if SPL should start the kernel, "1" if U-Boot
                must be started.
 
                Returns "0" if SPL should start the kernel, "1" if U-Boot
                must be started.
 

+Environment variables
+---------------------
+
+A board may chose to look at the environment for decisions about falcon
+mode.  In this case the following variables may be supported:
+
+boot_os :              Set to yes/Yes/true/True/1 to enable booting to OS,
+                       any other value to fall back to U-Boot (including
+                       unset)
+falcon_args_file :     Filename to load as the 'args' portion of falcon mode
+                       rather than the hard-coded value.
+falcon_image_file :    Filename to load as the OS image portion of falcon
+                       mode rather than the hard-coded value.

 
 Using spl command
 -----------------
 
 Using spl command
 -----------------