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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/soc/esp32/include/soc/dport_reg.h
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@@ -4261,7 +4261,9 @@
/* Flash MMU table for APP CPU */
#define DPORT_APP_FLASH_MMU_TABLE ((volatile uint32_t*) 0x3FF12000)
#define DPORT_FLASH_MMU_TABLE_SIZE 0x100
#define DPORT_FLASH_MMU_TABLE_INVALID_VAL 0x100
#endif /*_SOC_DPORT_REG_H_ */