Hi Clemens,
2017-12-20 20:08 GMT-02:00 Clemens Gruber clemens.gruber@pqgruber.com:
The blob_encap and blob_decap functions were not flushing the dcache before passing data to CAAM/DMA and not invalidating the dcache when getting data back. Therefore, blob encapsulation and decapsulation failed with errors like the following due to data cache incoherency: "40000006: DECO: desc idx 0: Invalid KEY command"
To ensure coherency, we allocate aligned memory to store the data passed to/from CAAM and flush/invalidate the memory regions. Blobs can now be encapsulated and decapsulated with the blob cmd as well as from board code by calling blob_encap and blob_decap directly.
Tested on an i.MX6Q board.
I tested your patch on a closed i.MX6QSabreAuto and the functions blob_encap() and blob_decap() are working fine. In my environment I had to add a small modification in function do_blob() in cmd/blob.c file to get the cmd blob working:
+ hab_caam_clock_enable(1); + sec_init();
I will investigate this and provide a fix.
Signed-off-by: Clemens Gruber clemens.gruber@pqgruber.com
Tested-by: Breno Lima breno.lima@nxp.com
Thanks