uart_r32
u32 reg = uart_r32(UART_REG_LCR + (0x100 * i));
while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)