[ECOS] GDB-Monitor questions

[ECOS] GDB-Monitor questions

[Martin Laabs]

Hi,

today I ported eCos on my LPC2119 board. Redboot and some test application  
works fine.
Because redboot uses almost the whole RAM i can't use it for source-level  
debugging. Now I build a gdb stub that uses about 6k RAM and 24k Flash -  
much mor usable than redboot. (But 6k RAM usage is still much since the  
device has only 16kB.)
However - since most application won't fit in the remaining RAM I'd like  
to debug the "user"-application from flash.
I had two ideas how to realize that. The first idea was to build the  
libtarget.a with source-level debug support. With such a 'libtarget.a' I  
could just write my application, link it together and debug it via the  
serial channel since the gdb-stub is included in the libtarget.a.

I tried that - but unfortunately this did not work - I don't know whether  
I made a mistake or this is impossible in principal The images I created  
this way just printed a '+' and did not communicate further. (Althougt the  
"standalone" gdb_module image worked absolute ok.) Has anyone an idea why  
this did not worked?

The second idea was to build the gdb stub the conventinonal way and  
download the gdb_module image to the target.
The user-application should get a different linker script to use only the  
ram and flash sectors that are unused. One advantage of that way would be  
a faster download since I wouldn't had to download the gdb-stub every  
time. Did anyone ever realized such a scenario?

Thank you,
  Martin L.

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