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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.)
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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2
components/bootloader_support/include_priv/bootloader_sha.h
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@@ -1,4 +1,4 @@
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.