Re: [Sdcc-user] xdata variable initialization, no _mcs51_genXINIT in .asm?

[Maarten B. <sou...@ds...>]

Hi Jason,

What you're missing is the fact that these globals are there to tell the 
linker to include the corresponding libraries. The actual genXINIT is in 
crtxinit.asm/.rel.

You haven't by accident turned off the internal XRAM?

> I'm using the most recent SDCC snapshot [2.4.8 #961 (Feb 16 2005)
> (MINGW32)] to compile for an Atmel T89C51RD2 and I seem to be having
> issues with global variable initialization.  When trying to do
> something like:
> 
> const xdata unsigned char EXAMPLE[64] = {0x00, 0x01, ... , 0x62, 0x63};
> 
> I can see the initialized values in my .asm file under the XINIT
> .area.  However when running the program, the data accessed by
> EXAMPLE[i] gives unexpected results and not my initialized data.
> 
> When inspecting my .asm file I see where the global is declared
> (_mcs51_genXINIT) that's supposed to handle initialization, but no
> code is ever defined to actually copy the XINIT data to XISEG (see
> below).
> 
> I'm relatively new to embedded programming, especially compiling with
> SDCC.  Am I missing something, or isn't there supposed to be assembly
> code generated for _mcs51_genXINIT (and other startup globals like
> _mcs51_genXRAMCLEAR)???
> 
> Thanks.
> 
> ********
> ;--------------------------------------------------------
> ; global & static initialisations
> ;--------------------------------------------------------
> 	.area CSEG    (CODE)
> 	.area GSINIT  (CODE)
> 	.area GSFINAL (CODE)
> 	.area GSINIT  (CODE)
> 	.globl __sdcc_gsinit_startup
> 	.globl __sdcc_program_startup
> 	.globl __start__stack
> 	.globl __mcs51_genXINIT
> 	.globl __mcs51_genXRAMCLEAR
> 	.globl __mcs51_genRAMCLEAR
> 	.area GSFINAL (CODE)
> 	ljmp	__sdcc_program_startup
> ********
> 
> 
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