Public bug reported:
This patch is needed for Vera to workaround an issue.
Add CONFIG_ARM64_WORKAROUND_NC_TO_NGNRE configuration option that
enables conversion of MT_NORMAL_NC (Normal Non-Cacheable) memory
attribute to Device-nGnRE memory type in MAIR_EL1 for hardware that
requires stricter memory ordering or has issues with Non-Cacheable
memory mappings.
Tested kernel parameter enabled and disabled:
Verified workaround status is properly reflected in kernel log
Verified that mair is set correctly for all CPUs
Verified pgprot_dmacoherent works correctly
Verified unaligned access to ioremap_wc generates SIGBUS when workaround enabled
** Affects: linux-nvidia (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2138952
Title:
Backport NVIDIA: VR: SAUCE: arm64: Add workaround to convert
MT_NORMAL_NC to Device-nGnRE
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