Given a specification of bitfields defined e.g. as follows:
specfile:
{
"field1" : 8,
"field2" : 4,
"field3" : 4
}
and a set of values for setting defaults:
setterfile:
{
"field1" = 0xff,
"field2" = 0xf,
"field3" = 0xf
}
You can generate a binary packed blob as follows:
./blobtool specfile setterfile binaryoutput
binaryoutput: ff ff
The reverse is also possible, i.e. you can regenerate the setter:
./blobtool -d specfile binaryoutput setterorig
setterorig:
# AUTOGENERATED SETTER BY BLOBTOOL
{
"field1" = 0xff,
"field2" = 0xf,
"field3" = 0xf
}
This tool comes with spec/set files for X200 flash descriptor
and ICH9M GbE region, and can be extended or used to decompile
other data blobs with known specs.
BUG=none
BRANCH=none
TEST=none
Change-Id: Ie8421c67f404631376d83e26f18301b34881cb5a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 0685322f4a
Original-Change-Id: I744d6b421003feb4fc460133603af7e6bd80b1d6
Original-Signed-off-by: Damien Zammit <damien@zamaudio.com>
Original-Reviewed-on: https://review.coreboot.org/17445
Original-Tested-by: build bot (Jenkins)
Original-Reviewed-by: Jonathan Neuschfer <j.neuschaefer@gmx.net>
Original-Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://chromium-review.googlesource.com/438059
