[U-Boot] [PATCH V3 8/8] savebp: added Readme

[Simon Schwarz]

Adds a Readme for the savebp command

Signed-off-by: Simon Schwarz <simonschwarzcor at gmail.com>
---

V2 changes:
ADDED in V2

V3 changes:
nothing
---
 doc/README.commands.savebp |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)
 create mode 100644 doc/README.commands.savebp

diff --git a/doc/README.commands.savebp b/doc/README.commands.savebp
new file mode 100644
index 0000000..dc05ee0
--- /dev/null
+++ b/doc/README.commands.savebp
@@ -0,0 +1,28 @@
+The savebp (=save boot parameters) is used to save a boot parameter image to
+non-volatile memory.
+
+To execute the command everything has to be in place as if bootm should be
+used.
+(kernel image, initrd-image, fdt-image etc.)
+
+Call is:
+savebp [ftd|atags] [nand_offset] [kernel_addr] [initrd_addr] [fdt_addr]
+
+Only the first parameter [ftd|atags] is mandatory if the others are left blank
+standard values are used.
+
+e.g:
+savebp fdt 0x680000 0x82000000 0x80000100 -
+savebo atags
+
+typical call on OMAP3:
+nandecc hw
+nand read 0x82000000 0x280000 0x400000 /* Read kernel image from NAND */
+tftpboot 0x80000100 devkit8000.dtb /* Read fdt */
+savebp fdt 0x680000 0x82000000 0x80000100 - /* Save the image */
+
+------------Behind the scene---------------
+Atm the implementation is that we have /common/cmd_savebp.c which implements
+the command tself and the subcommand calls to bootm.
+Then the arch specific implementation of do_save_atags or do_savebp_fdt
+in /arch/arm/lib is called.
-- 
1.7.4.1