physical-memory-observe allows read access the to physical address space via the /dev/mem device.
When the kernel is compiled with STRICT_DEVMEM=y (required for certified kernels), accessible memory is an architecture-specific subset for common use cases, such as (eg, X without KMS, DOSBox, etc).
This interface can write to all physical memory when the kernel is compiled with STRICT_DEVMEM=n.
Requires snapd version 2.21+.
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