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S32K144EVB Secure Boot

Question asked by Bertrand Tay on Jul 25, 2018
Latest reply on Aug 20, 2018 by Bertrand Tay

Hi,

 

I'm trying out the secure boot feature on the S32K144EVB board. I'm being careful, as I don't want to brick the board. I'm seeing two different options for boot size:

 

1. In the sample code provided in AN5401SW, example #4 shows how to configure secure boot manually.  It sets the BOOT_SIZE to 128*1024*8.

 

2. In the SDK code for CSEC module provided by Processor Expert, the comments indicate the bootSize is the number of blocks of 128-bit data to check on boot. Maximum size is 512KB.

 

Based on (2), would the maximum bootSize be equals to (512KB / 128bit) = 4096?

 

But in (1), the BOOT_SIZE is defined as 128*1024*8 = 1,048,576.

 

What is the correct way to calculate the boot size?

 

Thanks!

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