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

Shaunak Datar (@skdatar) gitlab at rtems.org
Fri Jan 16 20:31:17 UTC 2026




Shaunak Datar commented on a discussion on bsps/aarch64/raspberrypi/start/mailbox.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139008

 > +    }
 > +
 > +    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;
 > +        }

Added a enum to fix this

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139008
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