UART011_CR_CTSEN
old_cr |= UART011_CR_CTSEN;
old_cr &= ~(UART011_CR_CTSEN | UART011_CR_RTSEN);
pl011_write((old_cr & ~UART011_CR_CTSEN) | (UART01x_CR_UARTEN | UART011_CR_TXE),
pl011_write((old_cr & ~UART011_CR_CTSEN) | (UART01x_CR_UARTEN | UART011_CR_TXE),