Ning Yang commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/47#note_111352 Hi @gedare, I reduced the use of `volatile` as much as possible. And finally found that it is necessary for the following functions to use `volatile`: `arm_pl011_write_char` : If there is no `volatile`, there will be problems with the output of printf. `arm_pl011_is_rxfifo_empty` `arm_pl011_is_txfifo_full` ``` /* * Wait for any data in the TXFIFO to be sent then wait while the * transmiter is active. */ while ( (((volatile arm_pl011_uart *) regs)->base.uartfr & PL011_UARTFR_TXFE) == 0 || (((volatile arm_pl011_uart *) regs)->base.uartfr & PL011_UARTFR_BUSY) != 0 ) { /* Wait */ } ``` -- View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/47#note_111352 You're receiving this email because of your account on gitlab.rtems.org.
_______________________________________________ bugs mailing list bugs@rtems.org http://lists.rtems.org/mailman/listinfo/bugs
