bootloader: Calculate SHA256 hash of image on every boot

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Makes app image booting more reliable (256-bit rather than 8-bit verification.)

Some measurements, time to boot a 655KB app.bin file and run to app_main() execution.

(All for rev 1 silicon, ie no 340ms spurious WDT delay.)

80MHz QIO mode:
before = 300ms
after = 140ms

40MHz DIO mode:
before = 712ms
after = 577ms

40MHz DIO mode, secure boot enabled
before = 1380ms
after = 934ms

(Secure boot involves two ECC signature verifications (partition table, app) that take approx 300ms each with 80MHz CPU.)

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This commit is contained in:

Angus Gratton

2017-06-28 16:46:34 +10:00

committed by Angus Gratton

parent caaa29c676

commit 17adb40ca8

12 changed files with 290 additions and 137 deletions

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components/esptool_py/esptool

Submodule components/esptool_py/esptool updated: 325f01637b...a4207741ec