AnsweredAssumed Answered

i.MX53 accidentally fell into security mode at boot

Question asked by torus1000 on Jun 15, 2016
Latest reply on Jun 24, 2016 by Artur Petukhov



One of i.MX53 sometimes accidentally fell into security mode(SM=01) after boot up in spite of other i.MX53 always keep on SM=00,  I don't know why.


Why did SM bit change to 01 and SRTC LP alarm? Which condition assumed to cause this issue?


Is there any workaround?


Here is SRTC register difference:

   reg     normal     issue happened

   ------- ---------- -----------

  LPSCMR  0x6        0x0        //LPSC mid

  LPSCLR  0xc80000   0x0        //LPSC low

  LPSAR   0x0        0x0

  LPSMCR  0x0        0x0

  LPCR    0xc008     0xc000     //EN_LP

  LPSR    0xe008     0xe400    //Security Mode(SM)=01,Alarm Flag of LP section*1

  LPPDR   0x41736166 0x41736166

   ------- ---------- -----------


*1: Indicates that the SRTC LP secured counter alarm has occurred.

Can anyone help me?