Can anyone explain how TZ technology is enabled in I.MX53 ? I am totally confused since internet says i.MX53 board has Trustzone enabled but all i can find is an interrupt controller in it. Where are the rest of the components as given in requirements of ARM trustzone? (TZPC TZMA etc).
Asked
Active
Viewed 733 times
2
-
See [Handling ARM trustzones](http://stackoverflow.com/questions/12334069/handling-arm-trustzones). Is there something specific to the iMX53 that you need to know about? – artless noise May 03 '13 at 21:18
1 Answers
0
Basically, Trustzone is buildin in the system and bootup in TrustZone mode. How this is possible is because of the HAB mechanism (High Assurance Boot bootchain) - which always boot into the Secure World first.
First this is how the bootup logic is burned into eFUSE:
Next are the bootup sequence:
https://www.nxp.com/docs/en/application-note/AN4581.pdf
Secure boot itself is configured via CSF:
https://community.nxp.com/thread/428505
For interrupt handling it always pass through the secure world first, before reaching the non-secure world, and for this it is called "Injecting interrupt" into non-secure world.
http://www.ic.unicamp.br/~edson/disciplinas/mc404/2012-2s/anexos/IMX53-tzic.pdf
For more info read these:
http://genode.org/documentation/articles/trustzone
https://www.nxp.com/docs/en/reference-manual/IMX53QSBRM.pdf
https://www.nxp.com/docs/en/application-note/AN4581.pdf
https://www.nxp.com/docs/en/supporting-information/DWF13_AMF_IND_T0291.pdf
Peter Teoh
- 6,337
- 4
- 42
- 58