EDMA access on C6657

Kushal Patel,

Kushal Patel: said:

I’m trying to read/write the EDMA registers starting of address 0x02700000, but I cannot access that memory region.

You can find the example code at: C:\ti\edma3_lld_02_11_05_02\examples\edma3_driver\evm6657
Any entity on the chip that has read/write access to the EDMA3 registers and can program an EDMA3 transfer.

You can check the read/write for EDMA memory mapped registers like below, this is only for your reference.

#define EDMA3_TPCC_BASE 0x02740000
#define IECRH (EDMA3_TPCC_BASE + 0x105C) // IECRH Control

*(int*)IECRH = 0xFFFFFFFF;

Hi,

When I'm accessing the EDMA registers starting off  0x02740000 , I can see the values and I think I can continue from there.

I was relying on TI Linux Host example - C:\ti\mcsdk_2_01_02_06\tools\boot_loader\examples\pcie\linux_host_loader

And on the pcidemo.c the definition for the EDMA base registers is 0x02700000

#define EDMA_TPCC0_BASE_ADDRESS      0x02700000

So as I described accessing that address is unsuccessful, but now I understand that it is a reserved memory space.

Once I changed the definition into #define EDMA_TPCC0_BASE_ADDRESS      0x02740000

That area became accessible.

I guess there should be #if EVMC6657L before the EDMA_TPCC0_BASE_ADDRESS definition in the Linux host example.

Thanks,

Roee