[avr-gcc-list] Puzzling Simulavr behaviour

[Erik Christiansen]

simulavr version 0.1.1.20030701

Simulavr is really useful, and simulavr-disp so nicely supplements ddd.
The following warnings, though, suggest that I don't quite have the hang
of it yet.

WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid addr: 
0x0460
WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid addr: 
0x0461

They appear, two per stepi, for each line in this listing from ddd's
"Machine Code Window". 

    0x46 <_start>:          ldi     r16, 0x04       ; 4
    0x48 <_start+2>:        out     0x3e, r16       ; 62
    0x4a <_start+4>:        ldi     r16, 0x5F       ; 95
    0x4c <_start+6>:        out     0x3d, r16       ; 61
    0x4e <_start+8>:        eor     r20, r20
    0x50 <_start+10>:       out     0x1a, r20       ; 26
    0x52 <_start+12>:       ldi     r20, 0xFF       ; 255
    0x54 <_start+14>:       out     0x1b, r20       ; 27
    0x56 <_start+16>:       ldi     r16, 0x0A       ; 10
    0x58 <_start+18>:       out     0x18, r1        ; 24
    0x5a <_start+20>:       ldi     r16, 0xFB       ; 251
    0x5c <_start+22>:       out     0x17, r1        ; 23

Providing a -D option to simulavr:

0x000000 (0x000000) : 0x940c : JMP
0x000023 (0x000046) : 0xe004 : LDI
0x000024 (0x000048) : 0xbf0e : OUT
0x000025 (0x00004a) : 0xe50f : LDI
0x000026 (0x00004c) : 0xbf0d : OUT
WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid
addr: 0x0460
WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid
addr: 0x0461
0x000027 (0x00004e) : 0x2744 : EOR
WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid
addr: 0x0460
WARNING: file ../../src/memory.c: line 148: **** Attempt to read invalid
addr: 0x0461

Throughout, the simulation works fine.
Simulavr-disp shows all the right things happening in the registers,
including the I/O ports.

Trying to track the cause:
In simulavr, the warning arises in mem_read() when VDevice* dev == NULL.
This seems to suggest that the device is unknown, but the invocation is:

simulavr -d atmega16 -g -P simulavr-disp &

and the response is:

Simulating a atmega16 device.

Trying -d=atmega16 , as in the manpage synopsis, causes:

WARNING: file ../../src/main.c: line 348: Device not supported:
=atmega16

and -datmega16 behaves the same as -d atmega16 .

Has anyone encountered something alike?

Regards,
Erik