uclinux dma write in control register

[Altera_Forum]

Hello, 

I have a problem, i use nios2 dma.c (uclinux dma api) when i write in control register example : OUTL(0x29a,DMA_BASE+REG_CONTROL) with REG_CONTROL = 24 when i read value : inl(DMA_BASE+REG_CONTROL) => i have control = 0x29a buttttt altera signaltap logic analyzer i have control = 0000  Can any one help me ? Thanks

[Altera_Forum]

I resolve problem : i use ioremap()

[Altera_Forum]

I want to know how to use the dma API in the nios2/kernel/dma.c,there is not any .h file,and I want to use the nios2 dma in other place,what should I do?Thank you in advance.