Re: [PATCH v2 0/5] iommu: Support identity mappings of reserved-memory regions

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On Sun, Oct 03, 2021 at 04:09:56AM +0300, Dmitry Osipenko wrote:
> 23.04.2021 19:32, Thierry Reding пишет:
> > I've made corresponding changes in the proprietary bootloader, added a
> > compatibility shim in U-Boot (which forwards information created by the
> > proprietary bootloader to the kernel) and the attached patches to test
> > this on Jetson TX1, Jetson TX2 and Jetson AGX Xavier.
> 
> Could you please tell what downstream kernel does for coping with the
> identity mappings in conjunction with the original proprietary bootloader?
> 
> If there is some other method of passing mappings to kernel, could it be
> supported by upstream? Putting burden on users to upgrade bootloader
> feels a bit inconvenient.

It depends on the chip generation. As far as I know there have been
several iterations. The earliest was to pass this information via a
command-line option, but more recent versions use device tree to pass
this information in a similar way as described here. However, these
use non-standard DT bindings, so I don't think we can just implement
them as-is.

Thierry

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