 Question: Restrictions on location of .const and .bss Answer: The .const and .bss sections generated by the compiler are accessed using " direct addressing " that uses the processor's DP register. For this reason, there are special restrictions regarding their locations: -Restrictions under Floating-Point compiler: When using small memory model, sections .const and .bss MUST be linked in the same data page (i.e the 16 MSBits of their memory address should be the same) because the compiler uses direct addressing to access them. Otherwise, this could cause wrong execution of the program. This doesn't apply to the large memory model. -Restrictions under Fixed-Point compiler: No restriction exists in the location of .bss and .const because the Fixed-point compiler always initializes the DP before accessing each memory location. |