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Specific Xdata address

We are using uVision2 (Keil C51 compiler, PK51) to develop a software for Silab F126 microcontroller. This code is structured in code banking and used multitasking RTX51 as well. Our hardware design has a off chip ram (xdata) however our configuration is using 0-1FFFH on chip and using off chip up to 1M. In order to keep variables and table for RTX51 and some global variables in first 2000H of on chip xdata, we have added this lines below in uVision2 (Target ->Option->BL51->Xdata). So, now we are switching this project to use LX51 rather than BL51. Does anybody how to config in LX51 to do the same job as BL51. Thanks for your help

?RTX?TASKCONTEXT?0, ?RTX?TASKCONTEXT?1, ?RTX?TASKCONTEXT?2, ?RTX?TASKCONTEXT?3, ?RTX?TASKCONTEXT?4, ?RTX?TASKCONTEXT?5, ?RTX?TASKCONTEXT?6, ?RTX?TASKCONTEXT?7, ?RTX?TASKCONTEXT?8, ?RTX?TASKCONTEXT?9, ?RTX?TASKCONTEXT?10, ?RTX?TASKCONTEXT?11, ?RTX?TASKCONTEXT?12, ?RTX?TASKCONTEXT?13, ?RTX?TASKCONTEXT?14, ?RTX?TASKCONTEXT?15, ?RTX?RTX_MBX_PAGE, ?RTX?RTX_AUX_PAGE, ?RTX?RTX_SYS_PAGE, ?RTX?USER_NUM_TABLE?S, ?RTX?RTX_SEM_PAGE, ?XD?READXMIT, ?XD?XDATA

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