Zilog ZUSBOPTS - Manual (Page 349)

UM017105-0511 Program Configurations
Zilog Developer Studio II – ZNEO™
User Manual
321
This directs the C-Compiler to generate different code segment names for each file.
2. Add the linker commands to place the particular segment in ERAM at run time and
EROM at load time.
For example, to copy the code for main.c to ERAM, add the following linker com-
mands in the Additional Linker Directives dialog box (see Additional Directives –
see page 62):
change main_TEXT=ERAM /* Run time main_TEXT is in ERAM space */
copy main_TEXT EROM /* Load time main_TEXT is in EROM space */
define _low_main_copy = copy base of main_TEXT
define _low_main = base of main_TEXT
define _len_main = length of main_TEXT
3. The linker COPY directive only designates the load addresses and the run-time
addresses for the segment. The actual copying of the segment must be performed by
the start-up code. For example, if you are using the small model, copy and modify the
C startup provided in the installation under
src\boot\common\startupexs.asm ,
rewriting the relevant section as follows:
;
; Copy main_TEXT into ERAM
;
LEA R0,_low_main_copy
LEA R1,_low_main
LD R2,#_len_main+1
JP mlab1
mlab0:
LD.B R3,(R0++)
LD.B (R1++),R3
mlab1:
DJNZ R2,mlab0
XREF _low_main_copy:EROM
XREF _len_main:ERAM
XREF _low_main:ERAM
4. Finally, add your modified start-up module to your project by selecting the Included
in Project button in the Objects and Libraries page of the Project Settings dialog
box (see C Start-up Module – see page 66) and also add the modified source code file
to your project using the Add Files command from the Project menu.
Assembly Program Setup
The Assembly program setup for the Copy to ERAM Program Configuration is similar to
the Default Program Configuration with some additional guidelines, as described in this
section.