32 bit Header Valid
Pattern
32 bit Image Size
32 bit JTAG Image
pattern
Image SHA pattern
Initial Stack Pointer (SP)
Reset Vector (PC)
User Application
Image Linked to run
from 0x0100_0800
Serial Flash On-Chip Flash
Initial Stack Pointer (SP)
Reset Vector (PC)
Bootloader scans &
detects a new image
on seral flash and
copies it onto On-
Chip Flash.
Bootloader computes and store the
SHA-1 hash of the on serial flash in a
file "/sys/mcuflashimghash.bin"
Application code
2 KB header
SHA-1 Hash
‘/sys/mcuflashimg.bin’
Image Authentication and Integrity Check
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SWRU543–January 2019
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On-Chip Parallel Flash
Figure 21-13. On-Chip Flash Programming and Update
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