LSR_TSRE
while ((uart_read(com_lsr) & LSR_TSRE) == 0 && --timo > 0)
while ((com0addr[COM_REG_LSR * 4] & LSR_TSRE) == 0)
while ((com0addr[com_lsr] & LSR_TSRE) == 0 && --timo > 0)
while (!(uart[com_lsr] & htobe32(LSR_TSRE)))
while ((le32toh(com0addr[com_lsr]) & LSR_TSRE) == 0)
while ((uart_read(RA_UART_LSR) & LSR_TSRE) == 0 && --timo > 0)
while ((be32toh(com0addr[com_lsr]) & LSR_TSRE) == 0)