uart_phy_write_register
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_ADDR, vpi2caddr);
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_OFFSET, vpi2creg);
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_READ, b);
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_DATA_WR, reg_v);
err = uart_phy_write_register(fd, debug, SCMD_REG_REM_WRITE, b);
err = uart_phy_write_register(fd, debug, reg, reg_v);