HPS2FPGA bridge, DMA

Hello everybody, i'm trying to make some simple project on DE1-SoC and have problems with H2F bridge. I have a GHRD as a base and i try to read from Onchip RAM to HPS RAM. Problem is that i don't really sure that i work with OCRAM. I can write and read from 0xc0000000+, but when i initialize OCRAM with .hex file in QSYS and then read this data from bare-metal app, i read nulls. Looks like i read from other undefined place.

I initialize bridges like that it was in my university labs:

 if (status == ALT_E_SUCCESS)    {
        status = socfpga_bridge_setup(ALT_BRIDGE_LWH2F);
    }
    if (status == ALT_E_SUCCESS)
    {
        status = socfpga_bridge_setup(ALT_BRIDGE_H2F);
    }

ALT_STATUS_CODE socfpga_bridge_setup(ALT_BRIDGE_t bridge){
    printf("INFO: Setup Bridge  ...\n", (int)bridge);
    ALT_STATUS_CODE status = ALT_E_SUCCESS;
    if (status == ALT_E_SUCCESS)
    {
        // STEP 12:
        status = alt_bridge_init(bridge, NULL, NULL);//   Attempt to initialize the bridges
    }
    if (status == ALT_E_SUCCESS)
    {
        status = alt_addr_space_remap(ALT_ADDR_SPACE_MPU_ZERO_AT_BOOTROM,
                                      ALT_ADDR_SPACE_NONMPU_ZERO_AT_OCRAM,
                                      ALT_ADDR_SPACE_H2F_ACCESSIBLE,
                                      ALT_ADDR_SPACE_LWH2F_ACCESSIBLE);
    }
    if (status == ALT_E_SUCCESS)
    {
        printf("INFO: Setup of Bridge  successful.\n\n", (int)bridge);
    }
    else
    {
        printf("ERROR: Setup of Bridge  return non-SUCCESS %d.\n\n", (int)bridge, (int)status);
    }
    return status;
}

I dont know should it work with initialized in qsys ocram, or if i dont want to fill ocram myself, i need to something else?

I read try to read like that:

for (uint32_t i = 0; i < 128; ++i)    {
        printf("FPGA_RAM= \n",(unsigned int)alt_read_word(ALT_H2F_BASE+ALT_H2F_RAM_OFFSET+offset));
        temp++;
        offset=offset+4;
     }

where ALT_H2F_BASE=0xc0000000, and ALT_H2F_RAM_OFFSET=0x00000000.

And the second question for my future plan is how to make dma transfer fron fpga ram ro hps ocram? is there enough alt_dma_memory_to_memory() or i should do this another way?

I've never worked with SoC and it difficult for me to understand some things and Altera manuals.

P.S.: sorry for mistakes i'm bad in english, but i hope you understand and will help me. Thanks:rolleyes: