Hi,
As you know that the FOPT register is loaded from the flash configuration field at address 0x40D in flash memory after Reset, so it is impossible that you write the FOPT directly in order to run from flash directly after next Reset. Instead, you have to write the FOPT location in flash configuration field.
For detailed inf, pls refer to section 6.3.2 Start-up Process in the MC56F83xxxRM.pdf.
In the SDK example, we provide flash_config.c and Flash_config.h, as the following screenshot, pls change the macro
#define FCF_FLASH_OPTION_BYTE 0xFFU
to
#define FCF_FLASH_OPTION_BYTE 0x7EU
The flash configuration field corresponding FOPT location will be changed.
the DSC will start running from flash directly.
6.3.2 Start-up Process
Any of the following conditions will force the hardware to start the Bootloader:
• FOPT [7:6] is set to 2'b11. This forces the ROM to run out of reset.
• A user applications running on flash or RAM calls into the Bootloader entry point
address in ROM, 0x780E7 for this device, to start Bootloader execution.
The FOPT register determines the boot source. The FOPT register is loaded from the
flash configuration field at address 0x40D in flash memory. The value of
FOPT[7:6]&(~SIM_BOOT_MODE_OVERRIDE[BOOT_OVERRIDE]) determines the
boot option: value 11b means booting from ROM, while any other value means booting
from flash. Flash memory defaults to all 1s when erased, and
SIM_BOOT_MODE_OVERRIDE[BOOT_OVERRIDE] is 00b after power on reset, so a
blank chip will automatically boot to ROM. See the "FTFE_FOPT Register" section in
the "Chip Configuration" chapter for more details.
When the ROM is executed out of reset, vector fetches from the CPU are redirected to
the ROM's vector table in ROM memory at offset 0x07_8000. This ensures that any
exceptions will be handled by the ROM.
After the Bootloader has started, the following procedure starts bootloader operations
Hope it can help you
BR
XiangJun Rong
Hi,
As you know that the FOPT register is loaded from the flash configuration field at address 0x40D in flash memory after Reset, so it is impossible that you write the FOPT directly in order to run from flash directly after next Reset. Instead, you have to write the FOPT location in flash configuration field.
For detailed inf, pls refer to section 6.3.2 Start-up Process in the MC56F83xxxRM.pdf.
In the SDK example, we provide flash_config.c and Flash_config.h, as the following screenshot, pls change the macro
#define FCF_FLASH_OPTION_BYTE 0xFFU
to
#define FCF_FLASH_OPTION_BYTE 0x7EU
The flash configuration field corresponding FOPT location will be changed.
the DSC will start running from flash directly.
6.3.2 Start-up Process
Any of the following conditions will force the hardware to start the Bootloader:
• FOPT [7:6] is set to 2'b11. This forces the ROM to run out of reset.
• A user applications running on flash or RAM calls into the Bootloader entry point
address in ROM, 0x780E7 for this device, to start Bootloader execution.
The FOPT register determines the boot source. The FOPT register is loaded from the
flash configuration field at address 0x40D in flash memory. The value of
FOPT[7:6]&(~SIM_BOOT_MODE_OVERRIDE[BOOT_OVERRIDE]) determines the
boot option: value 11b means booting from ROM, while any other value means booting
from flash. Flash memory defaults to all 1s when erased, and
SIM_BOOT_MODE_OVERRIDE[BOOT_OVERRIDE] is 00b after power on reset, so a
blank chip will automatically boot to ROM. See the "FTFE_FOPT Register" section in
the "Chip Configuration" chapter for more details.
When the ROM is executed out of reset, vector fetches from the CPU are redirected to
the ROM's vector table in ROM memory at offset 0x07_8000. This ensures that any
exceptions will be handled by the ROM.
After the Bootloader has started, the following procedure starts bootloader operations
Hope it can help you
BR
XiangJun Rong
