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J. Nick Koston
b99a4aab98
Two issues: 1. safe_read_code_byte used volatile cast which prevented the compiler from using flash-safe l32i instructions, causing LoadStoreError on IROM addresses. Replace with progmem_read_byte. 2. IROM upper bound (0x40400000 = 2MB) was too generous for devices with smaller flash (e.g. 1MB), causing both false positives in the backtrace and faults when is_return_addr tried to verify CALL instructions at unmapped addresses. Use _irom0_text_start/end linker symbols for precise firmware code bounds.
