[sdcc-devel] [ sdcc-Bugs-880197 ] Unable to write to code memory using a pointer?

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Bugs item #880197, was opened at 2004-01-19 16:50
Message generated for change (Comment added) made by epetrich
You can respond by visiting: 
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Category: msc51(8051) target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Michael Broxton (mbroxton)
Assigned to: Nobody/Anonymous (nobody)
Summary: Unable to write to code memory using a pointer?

Initial Comment:
When compiling the attached test code using the following 
command:

/usr/local/bin/sdcc -I. --model-large -c test.c

I receive the following error: 

test.c:32: error: FATAL Compiler Internal Error in file 'gen.c' 
line number '8381' : genPointerSet: illegal pointer type 
Contact Author with source code

This error occurs whenever I attempt to write to code 
memory using a (unsigned char code *) pointer, as I do in 
line 28 of this file.   (Side question -- Is this the same as a 
(code unsigned char *) pointer??)  

Is it possible to write to flash memory using sdcc?  Is this a 
bug or an unemplemented feature?

I'm developing on a Cygnal Systems 8051 core 
microcontroller, which has 32Kb of rewritable internal flash 
memory for its code space.  

SDCC Version info:
SDCC : mcs51/gbz80/z80/avr/ds390/pic14/pic16/TININative/
xa51/ds400/hc08 2.3.6 (01/06/04) (UNIX)

Thanks for your help,

Michael

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>Comment By: Erik Petrich (epetrich)
Date: 2004-01-19 17:19

Message:
Logged In: YES 
user_id=635249

A standard 8051 has no instruction to write to code space,
so the code generator is at a complete loss as to how to
implement your request; thus the fatal internal error. You
will need to check your microcontroller's data sheet for
more information on how they implemented writes to the flash
memory.

The bug we need to fix is to catch this with a reasonable
error message before the code generator chokes on it.


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