Raspberry Pi 5 - Hackdot

Re:Raspberry Pi 5 by bpye on Thursday September 28, 2023 @12:08PM (#37691664)

I see that the PR against the Raspberry Pi linux repo is out [0]. Interestingly they are introducing a BCM2712 defconfig with a 64k default page size.

From the device tree [1] it looks like they've rolled their own IOMMU rather than using ARM's SMMU which is annoying.

[0] - https://github.com/raspberrypi/linux/pull/5618

[1] - https://github.com/raspberrypi/linux/blob/9c75e5408c01cb7c65...

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Re:Raspberry Pi 5 by fanf2 on Thursday September 28, 2023 @02:30PM (#37693676)

Interesting. Did the earlier Raspberry Pi Broadcom SOCs not have an IOMMU? If they did I would have expected the 5 to be compatible with older ones.

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Re:Raspberry Pi 5 by bpye on Thursday September 28, 2023 @03:20PM (#37694360)

I'm fairly sure that none of the earlier SoCs had an IOMMU. It's of course possible that there was one hidden in the GPU or something, but nothing on the CPU side.

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Re:Raspberry Pi 5 by proompter5 on Wednesday October 04, 2023 @04:22AM (#37762368)

What would be the benefit of having their own IOMMU instead of just using the ARM SMMU?

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