[Sdcc-user] xdata initialization (mcs51)

[Dennis M. <djm...@gm...>]

When I invoke sdcc with a global static variable in my firmware like this:

xdata unsigned char buf[10];

It works and I can use the buffer.

When I change the buffer to instead have allocated data like this:

xdata unsigned char buf[] = {
0xXX, 0xYY, 0xZZ etc };

The firmware doesn't run.

Here is what I'm changing in my c code:

xdata BYTE serial_iic[5];

is changed to:

xdata BYTE serial_iic[] = {
  0xc2, 0xb4, 0x04, 0x82, 0x00 
};

Here is a diff between a working and non_working example asm files 
output by sdcc.

--- eeprom.asm  2008-10-20 16:44:36.000000000 -0600
+++ eeprom.asm_broken   2008-10-20 16:25:09.000000000 -0600
@@ -777,8 +777,6 @@
 _D4OFF =       0xa000
 _D5ON  =       0xb800
 _D5OFF =       0xb000
-_serial_iic::
-       .ds 5
 ;--------------------------------------------------------
 ; absolute external ram data
 ;--------------------------------------------------------
@@ -787,6 +785,8 @@
 ; external initialized ram data
 ;--------------------------------------------------------
        .area XISEG   (XDATA)
+_serial_iic::
+       .ds 5
        .area HOME    (CODE)
        .area GSINIT0 (CODE)
        .area GSINIT1 (CODE)
@@ -1096,4 +1096,10 @@
        .db 0x0A
        .db 0x00
        .area XINIT   (CODE)
+__xinit__serial_iic:
+       .db #0xC2
+       .db #0xB4
+       .db #0x04
+       .db #0x82
+       .db #0x00
        .area CABS    (ABS,CODE)

It seems to me that the addition of the __xinit_serial_iic label causes 
things to break.  Any thoughts?

Thanks
Dennis