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External RAM problem

I am using at89c51re2 mcu with LH52256-70 32k XRAM in system with graphical lCD 128x64. I have problem to initialize LCD. This is part of code where I config pins and select memory location for lcd bus in XRAM

unsigned char xdata lcd_bus _at_ 0x0000;

sbit RS=P0^0;
sbit E=P0^5;
sbit CS1=P0^1;
sbit CS2=P0^2;

Then in main.c I call function Init()

void Init()
{
CS1=1;
CS2=1;
SdCmd(0x3f);  //postavljanje y adrese na 63
SdCmd(0xc0);  //postavljanje x adrese na 0
CleanScreen();
delay(255);
}

But there is no reaction of LCD. Should I config AUXR register or something else?

Thanks in advance
Mark

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