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Yes, a custom qualifier can be created in C++ to relocate data types to flash memory. This can be done using the 'attribute' keyword in C++, which allows the programmer to specify compiler-specific attributes for the code.
For example, a custom qualifier can be defined as follows:
#define FLASH_DATA __attribute__((section(".flash_data")))
FLASH_DATA int my_data = 10;
In this example, the 'FLASHDATA' qualifier is defined using the 'attribute' keyword and specifies that the 'mydata' variable should be placed in the '.flash_data' section, which is located in the flash memory.
Note that the exact syntax and usage of custom qualifiers may vary depending on the compiler and platform being used.