Linux: am574x ddr ecc don't work when map 1GB emif1 to address 0xc0000000

My problem is when I config dmm like below，the ecc work well。
const struct dmm_lisa_map_regs lisa_map_2G_x_2_x_2_2G_x_1_x_2 = {
.dmm_lisa_map_0 = 0x0,
.dmm_lisa_map_1 = 0x80600100, /*emif1 1GB to 0x80000000 for arm*/
.dmm_lisa_map_2 = 0xc0600200, /*emif2 1GB to 0xC0000000 for dsp*/
.dmm_lisa_map_3 = 0xFF020100,
.is_ma_present = 0x1
};

What should I do when config dmm like below,emif1 map to 0xc0000000.
const struct dmm_lisa_map_regs lisa_map_2G_x_2_x_2_2G_x_1_x_2 = {
.dmm_lisa_map_0 = 0x0,
.dmm_lisa_map_1 = 0x80600200, /*emif2 1GB to 0x80000000 for arm*/
.dmm_lisa_map_2 = 0xc0600100, /*emif1 1GB to 0xC0000000 for dsp*/
.dmm_lisa_map_3 = 0xFF020100,
.is_ma_present = 0x1
};

Zheng,

With ECC off, are you able to access the DDR memory robustly in both configurations?

Tom

Hi Tom：
I can accsee both configurations correctly with ECC off.
Another question is what dose ".dmm_lisa_map_3 = 0xFF020100" mean?Is this necessary？

Zheng,

Since the memory accesses work correctly with ECC off but fail with ECC on, that points to an initialization problem.  Are you priming the ECC area before performing any reads?  Are the failures at the boundary of the memory block or anywhere in the block?

Tom