I am testing the memory overlay functionality for the MPC5744P. I can get RAM overlay to work as expected:
static void Overlay(uint32_t word0, uint32_t word1, uint32_t word2, uint32_t descriptor)
{
PFLASH->PFCRD[descriptor].Word0 = word0; /* Logical address */
PFLASH->PFCRD[descriptor].Word1 = word1; /* Physical address */
PFLASH->PFCRD[descriptor].Word2 = word2; /* Enable remapping for individual masters, size of page */
PFLASH->PFCRDE |= (uint32_t)0x80000000 >> descriptor; /* Enable descriptor */
PFLASH->PFCRCR |= (PFLASH_PFCRCR_GRMEN_MASK + PFLASH_PFCRCR_IRMEN_MASK); /* Global Remap Enable */
//PFLASH->PFCRCR |= (PFLASH_PFCRCR_GRMEN_MASK); /* Global Remap Enable */
}
... in app...
Overlay(0x09100000, 0x40040000, 0xFFFF0007, 1);
*(uint32_t*)0x40040000 = 0xAABBCCDD;
*(uint32_t*)0x40040004 = 0x11223344;
...
When I attempt to do the same operation for mapping flash, I do the following:
...
Overlay(0x09140000, 0x01000000, 0xFFFF0007, 0);
...
Correct me if I am wrong, but I am under the impression by "default" 0x09000000 mirrors 0x01000000, but manipulating the overlay functionality in the PFLASH module allows a user to create a virtual address so to speak to point to a different region - such as I did successfully with the RAM overlay.
The issue I am seeing is the following:
After I call the "Overlay" routine, I get this:
I do not understand why 0x09140000 is not mirroring 0x01000000... It looks like "junk" data in the memory window for 0x09140000.
1 解答
