malloc

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Hii all,
Right now I'm doing my embedded code based on M68000 processor.
Since that the code isn't so complex and I have also small 
memory built in, I decide not to put any OS on the system. 
In order to reserve space in memory for data buffer from 
UART interface (later on will be passed to the DSP), 
I make use of 'malloc' and 'free' function.
As I check 'malloc' source from newlib from cygnus, mentioned
like this :

/* VxWorks provides its own version of malloc, and we can't use this
   one because VxWorks does not provide sbrk.  So we have a hook to
   not compile this code.  */

Does it mean that I couldn't use this malloc if I don't implement
VxWorks OS in the system??
If yes, can anybody tell me other method to reserve memory space??
Thank's


Regards,
-- 
Dony
Email : dony@willowglen.com.sg
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