CCS/EVMK2G: unable to access SPI registers

Hi Yordan,

I have GEL files loading for the A15 and C66xx. On further investigation I found that the SPI registers were fine at the point execution runs to main(), inside main the first thing board setup is doing is calling the function MMUConfigAndEnable(), this is where the viewable values in the SPI rgisters disappear and are replaced with the "error: unable to read" message.

I dont have any experience of programming the MMU, so I'm not sure why this causes problems for the SPI registers. I also noticed the PLL registers are not viewable, but this is right after loading and before beginning to run code. I'm not sure if the two are related, or if there was something else I should have done with board configuration.

I tried changing the dip-switch options on the board on the board, but I'm not sure it helped any. I did try commenting out the MMU config and was able to keep the SPI register view, but I'm not sure I can just leave it out.

Thanks,

Steve

Hi Yordan,

I stepped down into MMU config and the last function "CP15MMUEnable" causes the issue below calling the line "MCR     p15, #0, r0, c1, c0, #0".

Steve

Hi Yordan,

I found I needed to add the following MMU setup code to mmu.c to enable the SPI register banks:

{

#define START_ADDR_DEV2                     (0x20000000) //0x20000000~0X7FFFFFFF

#define NUM_SECTIONS_DEV2                   1536

REGION regionDev2 = {

                        MMU_PGTYPE_SECTION, START_ADDR_DEV2, NUM_SECTIONS_DEV2,

                        MMU_MEMTYPE_DEVICE_SHAREABLE,

                        MMU_REGION_SECURE,

                        MMU_AP_PRV_RW_USR_RW ,

                        (unsigned int*)MMUTable

                       };

    MMUMemRegionMap(&regionDev2);

}

Unfortunately I'm still unsure why the PLL rgisters are not viewable on connection to the board.

Regards,

Steve