Since commit 3a11b1fbd2 (#16972)
building RIOT applications with `BOARD=hifive1` causes the following
linker error to be emitted on my system:
/opt/rv32imc/lib/gcc/riscv32-unknown-elf/10.2.0/../../../../riscv32-unknown-elf/bin/ld:riscv_base.ld:220: warning: memory region `rom' not declared
This is due to the fact that the RISC-V linker script doesn't have a rom
memory region. While many other ARM-based boards have a rom memory
region defined in the linker script, the corresponding region name in
the RISC-V linker script is flash and rom is not declared as a memory
region hence the warning.
I think this was accidentally overlooked in
3a11b1fbd2. It is fixed in this commit by
replacing the rom region with the flash region. The linker script
identifiers (e.g. _srom and _erom) are not renamed.
