[WinAVR-users] [ winavr-Bugs-1869080 ] External Memory: options mfile / avr-lib doc

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Bugs item #1869080, was opened at 2008-01-10 23:57
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: External Memory: options mfile / avr-lib doc

Initial Comment:
When using external memory (e.g. at ATmega128) the old option 
EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff
does not seem to work anymore.
By this the heap and data+bss section went into the external memory before.

Instead a 
EXTMEMOPTS = -Wl,--section-start,.data=0x801100,--defsym=__heap_end=0x80ffff
must be used.

So the explanation in the default mfile must be:

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# used for variables (.data/.bss) and heap (malloc()).
#EXTMEMOPTS = -Wl,--section-start,.data=0x801100,--defsym=__heap_end=0x80ffff

# 64 KB of external RAM, starting after internal RAM (ATmega128!),
# only used for heap (malloc()).
EXTMEMOPTS = -Wl,--defsym=__heap_start=0x801100,--defsym=__heap_end=0x80ffff

(In WinAVR20071221 the comments in the mfile is not up-to-date for the first case, the second comment is the new one for the first.)

If you choose the option in the mfile menu the result is correct.

The avr-lib documenation is also using
EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff

Both should be easy to fix.

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