Hello,
I have a hardware board with 80390 core. I want to use SDCC in ds390
flat42 (24 bit address) memory mode.
But I don't want to use tinibios and its startup code (tinibios has
_sdcc_external_startup, clock and serial port initialization).
I modified <SDCC>/device/examples/ds390/hello390.c to include my own
_sdcc_external_startup (and clock and serial port ISRs for satisfying
linker dependencies).
The above mentioned hello390.c is compiled/linked using the following
command
------------------------------------------------------------------------
----------------------
sdcc --verbose -mds390 --xram-loc 0x00 --code-loc 0x00 \
-Wl-r hello390.c --nostdlib
-l../../../lib/build/ds390/liblong.lib
-l../../../lib/build/ds390/libsdcc.lib
-l../../../lib/build/ds390/libfloat.lib
------------------------------------------------------------------------
----------------------
It generates hello390.ihx, which I am able to burn to my hw board's
flash (after converting to binary using hex2bin tool), but nothing
happens.
BTW, my main function in hello390.c is empty and I removed the printf
call as it was dependent on correct serial port initialization while I
am one step behind that for now.
All I want to know If my _sdcc_external_startup is called. This
function has nothing but clock init and controlling a LED using P1 SFR
output pin.
The assembly listing of the program shows that _sdcc_external_startup
is linked but the debug LED mentioned in previous line does not glow
(actually nothing happens at all).
I hope somebody could point me in right direction.
Thank you.
PS:
I am new to micro controller programming though have been working with
ARM arch for some time.
Arif M
Singapore
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