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[avr-libc-dev] [bug #26755] boot.h and ATMega48 and missing SIGRD

From: RaceMouse
Subject: [avr-libc-dev] [bug #26755] boot.h and ATMega48 and missing SIGRD
Date: Mon, 08 Jun 2009 05:17:34 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/2009042316 Firefox/3.0.10


                 Summary: boot.h and ATMega48 and missing SIGRD
                 Project: AVR C Runtime Library
            Submitted by: racemouse
            Submitted on: Mon 08 Jun 2009 05:17:32 GMT
                Category: Header
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Header files
                  Status: None
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.6.6
           Fixed Release: None



We tried to compile the boot_signature_byte_get() macro from avr/boot.h using
a mega48. The compiler complained "error: 'SIGRD' undeclared (first use in
this function)". 

Datasheet says about the bit 5 in SPMCSR:
• Bit 5 – Res: Reserved Bit
This bit is a reserved bit in the ATmega48P/88P/168P/328P and always read as

It can be worked around by manually defining SIGRD as 5 and therefore not a
complete showstopper...


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