dfu: add 'SCRIPT' entity
Define a new 'SCRIPT' type for DFU entities. The downloaded data are
treated as simple u-boot's scripts and executed with run_command_list()
function.
Flashing the 'SCRIPT' entity might result in changing the 'dfu_alt_info'
environment variable from the flashed script, so add a global variable
for tracking the potential need to reinitialize the dfu_alt_info related
structures.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
diff --git a/doc/README.dfu b/doc/README.dfu
index 6cb1cba..eacd5bb 100644
--- a/doc/README.dfu
+++ b/doc/README.dfu
@@ -17,7 +17,7 @@
- The access to mediums is done in DFU backends (driver/dfu)
Today the supported DFU backends are:
- - MMC (RAW or FAT / EXT2 / EXT3 / EXT4 file system / SKIP)
+ - MMC (RAW or FAT / EXT2 / EXT3 / EXT4 file system / SKIP / SCRIPT)
- NAND
- RAM
- SF (serial flash)
@@ -92,6 +92,7 @@
<name> fat <dev> <part_id> [mmcpart <num>] file in FAT partition
<name> ext4 <dev> <part_id> [mmcpart <num>] file in EXT4 partition
<name> skip 0 0 ignore flashed data
+ <name> script 0 0 execute commands in shell
with <partid> being the GPT or DOS partition index,
with <num> being the eMMC hardware partition number.
@@ -116,6 +117,20 @@
"u-boot-<board1>.bin raw 0x80 0x800; u-boot-<board2>.bin skip 0 0"
+ When flashing new system image requires do some more complex things
+ than just writing data to the storage medium, one can use 'script'
+ type. Data written to such entity will be executed as a command list
+ in the u-boot's shell. This for example allows to re-create partition
+ layout and even set new dfu_alt_info for the newly created paritions.
+ Such script would look like:
+ --->8---
+ setenv dfu_alt_info ...
+ setenv mbr_parts ...
+ mbr write ...
+ --->8---
+ Please note that this means that user will be able to execute any
+ arbitrary commands just like in the u-boot's shell.
+
"nand" (raw slc nand device)
cmd: dfu 0 nand <dev>
each element in "dfu_alt_info" =