i.MX ProcessorsのトピックRe: Test the Secure memory of CAAM

Test the Secure memory of CAAM

jason_rsmgnu — Fri, 23 Jun 2017 08:57:53 GMT

Reference the sm_test.c example, I test the Secure memory. But I find when I reboot the SOC(i.mx6q),power down and then on.

I can not read data from the slot ( sm_keystore_slot_read ), So can not store the cipher code in CAAM secure Memory.

Re: Test the Secure memory of CAAM

jason_rsmgnu — Fri, 23 Jun 2017 09:03:55 GMT

Add some information:

We have not battery power supply (SNVS) active,Because there are not battery design in our PCB Board. @Yuri Muhin

Re: Test the Secure memory of CAAM

Yuri — Mon, 26 Jun 2017 04:26:11 GMT

Hello,

Please apply battery (coin cell) supply to i.MX6 VDD_SNVS_IN.
From hardware point of view it is recommended to follow i.MX6 Reference design
for it. In particular : "A schottky diode may be required between VDDHIGH_IN and
VDD_SNVS_IN. Connect the cathode to VDD_SNVS_IN."
Also, You may refer to the Security Reference Manual for i.MX 6 for more details
regarding the Security memory.

Have a great day,
Yuri

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Re: Test the Secure memory of CAAM

jason_rsmgnu — Mon, 26 Jun 2017 06:21:42 GMT

Thank you, I know that means we maybe should design the new PCB ：（