CSRW Instruction error during compilation using PULP-RISC-V toolchain

[reinaldoasf]

Hello! I'm having an issue when I try to compile an OS using the PULP-RISC-V toolchain. During the process, I've reached this Error: Instruction csrw requires absolute expression.
The mentioned function is the following:

static inline void rv32gc_satp_write(rv32gc_word_t val)
{
asm volatile(
"csrw satp, %0;"
:
: "r" (val)
);
}