This patch completes introduction of building of proper RO and RW
images for cr50.
A few small mods were required:
- both RO and RW images have to be signed, using the same dedicated
signer, but with different keys, dev_key.pem is not needed any more.
- the RW image offset is not at the half of available flash, a chip
specific value of 16K is used instead.
The suggested new image layout is as follows:
+----------------------------------------+
| 1KB RO signature header. |
+----------------------------------------+
- -
| 15KB RO image. |
- -
+========================================+
| 1KB RW-A signature header. |
+----------------------------------------+
- -
- -
| 239K RW-A image. |
- -
- -
+========================================+
- -
| 16 KB NVRAM, shared |
- -
+========================================+
| 1KB RW-B signature header. |
+----------------------------------------+
- -
- -
| 239K RW-B image. |
- -
- -
+========================================+
BRANCH=none
BUG=chrome-os-partner:43025
TEST=The combined image (build/cr50/ec.hex) is successfully loaded and
started by the spiflash utility from the latest FPGA tarball.
Corrupting a byte in the generated image in the RW section causes
failure to verify.
Change-Id: I41a05168b0d4e9f88efa1003f261b6dd03972a24
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/311422
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
62691cac03