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

Thu Jan 15 22:42:50 UTC 2026

Kinsey Moore started a new discussion on bsps/aarch64/raspberrypi/start/mailbox.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_138814

 > +    }
 > +
 > +    BCM2835_REG(BCM2711_MBOX_WRITE) = (data & MBOX_MAIL_DATA_MASK) | (channel & MBOX_MAIL_CHANNEL_MASK);
 > +
 > +}
 > +
 > +uint32_t rpi_mbox_read(uint8_t channel){
 > +    uint32_t data;
 > +    while (1) {
 > +        while (BCM2835_REG(BCM2711_MBOX_STATUS) & BCM2711_MBOX_EMPTY) {
 > +        }
 > +        data = BCM2835_REG(BCM2711_MBOX_READ);
 > +
 > +        if ((data & MBOX_MAIL_CHANNEL_MASK) == channel) {
 > +            return data & MBOX_MAIL_DATA_MASK;
 > +        }

Validate channel here as well.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_138814
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