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AM2432: Rewriting values with KeyWriter

Andrea Politano
Intellectual 320 points

Part Number: AM2432

Hi, 

I am using AM2432 with the Industrial SDK 11.00.00.08.

I successfully converted a device from HS-FS to HS-FE using KeyWriter. Then I flashed the SBL and the application, both signed with my SMPK, and everything is working properly.

The command I used to generate the certificate to be provided to the keywriter is:

./gen_keywr_cert.sh -t tifek/ti_fek_public.pem -s mykey.pem --keycnt 1 --keyrev 1

So I chose a single SMPK without the BMPK, and I didn't use either SMEK or BMEK.
Now I would also like to add these new features: use a dual certificate with two key set, specify my key for encryption and have SBL antirollback.

If I generate a new certificate with these new features now, could I use the KeyWriter application on a device that has already been converted to HS-SE using the previous certificate? Or, even if I didn’t specify SMEK, BMPK and BMEK and SBL SWRV in the previous certificate, is it no longer possible to write these keys?

Thank you, 

Best Regards,

Andrea