Ask ioremap questions

For more information about ioremap-general Linux technology-Linux programming and kernel, see the following. I used at91rm9200 to plug-in an fpga. How fast can it be read/write?

U32 p;

P = ioremap (test_add1, 2 );

* (Volatile unsigned short *) p = 0x22;

P = ioremap (test_add2, 2 );

* (Volatile unsigned short *) p = 0x33;



When the two addresses are written, the cs effective time (low level) is 220ns, and the interval between the two addresses is 175us, which is too slow,
I just tested it again. If
U32 p;
P = ioremap (test_add1, 2 );

* (Volatile unsigned short *) p = 0x22;

P = ioremap (test_add2, 2 );

* (Volatile unsigned short *) p = 0x33;

The interval is 172us, but if
P = ioremap (FIG, 1024 );
For (I = 0; I <1024; I ++)
{
* (Volatile unsigned short *) p = I
P ++;
}
The whole time is us. What is the problem?

I think it is the same. Why is there such a big difference? Will ioremap take too much time?

Please help us with the solution. Thank you !!~~