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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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components/spi_flash/flash_mmap.c
+4 -4
View File
@@ -83,14 +83,14 @@ static void IRAM_ATTR spi_flash_mmap_init()
uint32_t entry_app = DPORT_APP_FLASH_MMU_TABLE[i];
if (entry_pro != entry_app) {
// clean up entries used by boot loader
entry_pro = INVALID_ENTRY_VAL;
DPORT_PRO_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
entry_pro = DPORT_FLASH_MMU_TABLE_INVALID_VAL;
DPORT_PRO_FLASH_MMU_TABLE[i] = DPORT_FLASH_MMU_TABLE_INVALID_VAL;
}
if ((entry_pro & INVALID_ENTRY_VAL) == 0 && (i == 0 || i == PRO_IRAM0_FIRST_USABLE_PAGE || entry_pro != 0)) {
s_mmap_page_refcnt[i] = 1;
} else {
DPORT_PRO_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
DPORT_APP_FLASH_MMU_TABLE[i] = INVALID_ENTRY_VAL;
DPORT_PRO_FLASH_MMU_TABLE[i] = DPORT_FLASH_MMU_TABLE_INVALID_VAL;
DPORT_APP_FLASH_MMU_TABLE[i] = DPORT_FLASH_MMU_TABLE_INVALID_VAL;
}
}
}