Dose CSEc use quick write mode to update CSEc keys?

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Dose CSEc use quick write mode to update CSEc keys?

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yaojianhang
Contributor II

HI, @lukaszadrapa

In S32K1xx reference manual CSEc chapter, it says interrupting a CSEc key update operation(due to power loss,reset....) whill leave the contents in an indeterminate state.

It seems that if CSEc update keys in quick write mode will solve the above problem, I am interested in S32K144, when update csec keys(located in EEPROM), how it actually works? write eeprom in quick write mode or normal write mode?

Regards,

yaojianhang

 

 

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yaojianhang
Contributor II

thanks for your reply.

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi @yaojianhang ,

we do not provide more details about the implementation. Mentioned comment about interruption of s CSEc key update is still valid. There's only one requirement mentioned in the reference manual (at CMD_LOAD_KEY command):

"Once a quick write is started, user must finish the entire
quick write activity prior to starting a LOAD_KEY
command."

Regards,

Lukas