RTEMS | bsp/aarch64/raspberrypi: Add Mailbox Support (!915)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on bsps/aarch64/raspberrypi/start/mailbox.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_138815

 > +
 > +    memset(buffer, 0, size);
 > +    return RTEMS_SUCCESSFUL;
 > +}
 > +
 > +
 > +
 > +void rpi_mbox_write(uint8_t channel, uint32_t data){
 > +    while(BCM2835_REG(BCM2711_MBOX_STATUS) & BCM2711_MBOX_FULL){
 > +    }
 > +
 > +    BCM2835_REG(BCM2711_MBOX_WRITE) = (data & MBOX_MAIL_DATA_MASK) | (channel & MBOX_MAIL_CHANNEL_MASK);
 > +
 > +}
 > +
 > +uint32_t rpi_mbox_read(uint8_t channel){

Channel validation and possibility of failure may require a change to this function signature.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_138815
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