Write to Avalon error

Hi, i cannot find where is mistake, if i use this:

IOWR(0x11020,0,0x01);

for(i=0;i<100000;i++);

IOWR(0x11024,0,0x01);

for(i=0;i<100000;i++);

IOWR(0x11028,0,0x01);

for(i=0;i<100000;i++);

IOWR(0x1102C,0,0x01);

everything is ok, but if i use this:

IOWR(MYCUSTOM_0_BASE,0,0x01);

for(i=0;i<100000;i++);

IOWR(MYCUSTOM_0_BASE,1,0x01);

for(i=0;i<100000;i++);

IOWR(MYCUSTOM_0_BASE,2,0x01);

for(i=0;i<100000;i++);

IOWR(MYCUSTOM_0_BASE,3,0x01);

MYCUSTOM_0_BASE is 0x11020, so it doesnt work.

What is difference? Any suggestions?

Vaclav