i.MX53 accidentally fell into security mode at boot

[torus1000]

Hi,

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?

[art]

The most likely cause of the issue is the effect of the silicon erratum ENGcm12374, please refer to its description in the i.MX53 Chip Errata Rev.6 document, available on the processor's Documentation web page:

http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i.mx-applications-process...

Have a great day,
Artur

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