user/grub: add arm-smmu.disable_bypass=n quirk for Cavium ThunderX
| Bugzilla ID | 311 |
| Reporter | Max Rees (sroracle) |
| Assignee | Max Rees (sroracle) |
| Reported | 2020-06-19 18:50:33 -0500 |
| Modified | 2020-06-22 06:03:19 -0500 |
| Status | CONFIRMED |
| Version | 1.0-RC1 |
| Hardware | Adélie Linux / [Community] ARM (64-bit) |
| Importance | --- / normal |
| Package(s) | user/grub |
| See also | https://bugzilla.redhat.com/show_bug.cgi?id=1734557 |
Description
Linux >= 5.2 contains the following commit, which breaks boot on Cavium ThunderX machines because the Gigabyte devicetree it uses is broken:
https://github.com/gregkh/linux/commit/954a03be033c7cef80ddc232e7cbdb17df735663
We need arm-smmu.disable_bypass=n on these machines.
The "see also" RH bug mentions that iommu.passthrough=1 may also be necessary, but it did not seem needed in order to boot athena.