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Re:Progress update from the Librem 5 hardware department by cjbprime on Wednesday September 05, 2018 @10:09AM (#17918089)
It can share the CPU's RAM chip without being able to read from (the rest of) it, because of the IOMMU.
Re:Progress update from the Librem 5 hardware department by subway on Thursday September 06, 2018 @10:01AM (#17926319)
And Qualcomm would never improperly configure their SMMU:

https://nvd.nist.gov/vuln/detail/CVE-2016-10444

They only sat on this one for two years before fixing it.