Hello.
I am working in "hello_world_mpc5748g" example project.
And I changed the "startup_MPC5748G.S" file in this example project.
Like this :
Original : this startup code is making CTR register value 128
But I wanted to make CTR register value 127.
So, I changed the code like that.
The reason why I changed it is I need to reserve the memory address "0x4003_FFF0".
"Initialise SRAM ECC" part (I attatched) changed the value of address "0x4003_FFF0".
But I don't know the "Initialise SRAM ECC" part is for what..
So my question is
1. Can I change the "Initialise SRAM ECC" part in Startup code?
I worry some unexpected problem would be ocurred.
2. What does the "Initialise SRAM ECC" part in Startup code do? Please Explain more.
Thanks
Best regards
Phillip
Hi Phillip,
here you can find the explanation:
It is possible to retain some SRAM content through reset but it depends which reset occurred.
Resets which destroy RAM content:
1. Power on Reset 2. Destructive reset 3. Long functional reset (with MBIST enabled)
Ram content is unchanged on:
1. Short functional reset 2. Long functional reset (MBIST disabled)
So, it is necessary to check the type of reset (see MC_RGM module). If it was reset which destroyed the RAM content, it is necessary to initialize whole SRAM. If that reset didn't destroy the RAM, you can skip initialization on desired area.
Regards,
Lukas
Hi Phillip,
here you can find the explanation:
It is possible to retain some SRAM content through reset but it depends which reset occurred.
Resets which destroy RAM content:
1. Power on Reset 2. Destructive reset 3. Long functional reset (with MBIST enabled)
Ram content is unchanged on:
1. Short functional reset 2. Long functional reset (MBIST disabled)
So, it is necessary to check the type of reset (see MC_RGM module). If it was reset which destroyed the RAM content, it is necessary to initialize whole SRAM. If that reset didn't destroy the RAM, you can skip initialization on desired area.
Regards,
Lukas
