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thebel1 / thgpio

Native ESXi driver for RPi 4's GPIO interface.
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Memory barriers may be needed around GPIO MMIO access #2

Open thebel1 opened 4 years ago

thebel1 commented 4 years ago

Creating this issue to remind myself to check whether memory barriers are required when other BCM2711 peripherals are being accessed concurrently to the GPIO device.

The BCM2711 datasheet is also not clear on whether MMIO is cache-coherent. Manual cache maintenance may be necessary.