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mpc57

‎09-12-2018 11:19 PM
1,288 Views
jackjack
Contributor III

what is mirror flash?

when i use overlayRAM for calibration(MPC5744P). I have a problem.

I remap RAM area(0x4005C000) to mirror flash（0x08F98000), i can change mirror flash data by changing data in 0x4005C000(data in 0x00F98000 will not change), but after i power down mpc5744p, then power up mpc5744p, mirror flash data become the same as data in 0x00F98000, does that mean mirror flash data can't be reserved after power down?

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‎09-18-2018 03:21 AM
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jackjack
Contributor III

thank you.

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‎09-18-2018 01:54 AM
886 Views
lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

it is expected behavior. When you change the data at 0x4005C000 (in RAM) then the same data will be visible at 0x08F98000. But this will not modify the flash content. Writing to 0x4005C000 changes the RAM data only.

Once the calibration is done, it is necessary to manually program the data from RAM to flash. This is not done automatically.

Regards,

Lukas

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