use descriptor chain in SGDMA

Hi Daixiwen

Thank you for the reply.

I use an on-chip memory for storing the descriptor.

The address of the on-chip memory is from 0x00040000 to 0x0004ffff.

The Nios II (data_master) and SGDMA (descriptor_read and descriptor_write) are connected to the on-chip memory.

I declare my descriptor table in the following code.

sgdma_desc = (alt_sgdma_descriptor*)ONCHIP_DESC_MEM_BASE;

ONCHIP_DESC_MEM_BASE is defined in system.h as follows:

# define ONCHIP_DESC_MEM_BASE 0x40000

For your last question, ("which memory is used for text, data, heap, stack and bss?") I don't know how to figure out these data in my program. Could you please give me some clues?

Thanks.