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Harden urclock against bootloader bricking

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- Detect write restrictions with new pgm->readonly(..., addr)
 - Check in byte-wise cached write whether mem/addr allows write
 - Emulated chip erase tells user CE is delayed until first -U
 - After bootloader CE urclock_chip_erase will init reset vector
 - Low level paged write @ 0 unconditionally protects reset vector
 - Low level paged read @ 0 checks and repairs reset vector
This commit is contained in:
Stefan Rueger
2022-11-16 00:08:46 +00:00
parent afc2f7cf0c
commit 82b9491cbd
5 changed files with 128 additions and 31 deletions
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src/libavrdude.h
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@@ -808,6 +808,8 @@ typedef struct programmer_t {
int (*chip_erase_cached)(const struct programmer_t *pgm, const AVRPART *p);
int (*page_erase_cached)(const struct programmer_t *pgm, const AVRPART *p, const AVRMEM *m,
unsigned int baseaddr);
int (*readonly) (const struct programmer_t *pgm, const AVRPART *p, const AVRMEM *m,
unsigned int addr);
int (*flush_cache) (const struct programmer_t *pgm, const AVRPART *p);
int (*reset_cache) (const struct programmer_t *pgm, const AVRPART *p);
AVR_Cache *cp_flash, *cp_eeprom;