Adds a Readme for the savebp command
Signed-off-by: Simon Schwarz simonschwarzcor@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.