If you create a new RI600V4 project for RX71M by using the sample project RX64M_RI600V4, the option function select register[sh1] (OFS0/OFS1) allocated to the option setting memory area (0x00120040-0x00120070) in internal ROM of RX71M has not been initialized.
Add the following immediately after the included header file.
#pragma address __OFS0reg=0x00120068 // OFS0 register
const unsigned long __OFS0reg = 0xffffffff;
#pragma address __OFS1reg=0x0012006c // OFS1 register
const unsigned long __OFS1reg = 0xffffffff;
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