lpcware

Reset after setting M3MEMMAP Register

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by gianlucarenzi on Mon Nov 19 09:06:56 MST 2012
Hello,
I am stuck on a reset-after-setting-the-m3memmap register.
Scenario: my application (a bootmonitor) is loaded from SPIFI at boot.
Before running main() it relocate itself into SRAM address space (0x1000_0000) VTOR and other stuff.
It uses the SPIFI (ROM)Library to access the SPIFI Device (64Mbit) to program/erase the device using a simple protocol via UART interface.
When the bootmonitor receive a JUMP instruction to execute the user-application something goes wrong:

The SPIFI Area (between 0 - 0x0008_0000) 512K are reserved for bootmonitor itself (remapped 0x1400_0000 - 0x1408_0000).
The SPIFI Area (between 0x0008_0000 up to 7.5MBytes) are reserved for user application (linked-relocated at 0x0000_0000 but physically located at those address space 0x1408_0000...0x1478_0000)

The bootmonitor when receive the JUMP command:

1- set the M3MEMMAP register to 0x1408_0000 (so at the next M3-reset the address 0x0000_0000 is relocated at 0x1408_0000) where are the VTORs data (SP, Reset Handler, Exception Handlers,...)
2- disable every interrupt using __disable_irq() provided by the CMSIS-Library
3- Hit a PERIPH_RST writing RGU_SIG_PERIPH bit (1) in the LPC_RGU->RESET_CTRL0 register.

Nothing happens. I thought my application stack pointer and Reset Handler started, but nothing.

If I use the RGU_SIG_CORE bit (0) in the LPC_RGU->RESET_CTRL0 register, ALL the system is rebooted as the PowerOn, so the M3MEMMAP has the 0x8000_0000 value.

Where I am doing the wrong thing?


Please help me,
Best regards,
Gianluca

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