[U-Boot] [PATCH] crypto/fsl: fix BLOB encapsulation and decapsulation

[Breno Matheus Lima]

Hi Clemens,

2017-12-20 20:08 GMT-02:00 Clemens Gruber <clemens.gruber at 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 at pqgruber.com>
Tested-by: Breno Lima <breno.lima at nxp.com>

Thanks