Public bug reported:

Booting 5.10-rc1+ on a Synquacer ARM64 development box crashes. Bisected
this down to:

commit e0d072782c734d27f5af062c62266f2598f68542 (HEAD, refs/bisect/bad)
Author: Jim Quinlan <james.quin...@broadcom.com>
Date:   Thu Sep 17 18:43:40 2020 +0200

    dma-mapping: introduce DMA range map, supplanting dma_pfn_offset


Disabling the sdchi driver and/or removing this commit allows the kernel to 
boot without the crash.

Attached is a photo of the crash.

** Affects: linux
     Importance: Unknown
         Status: Confirmed

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: Colin Ian King (colin-king)
         Status: In Progress

** Attachment added: "photo of crash"
   
https://bugs.launchpad.net/bugs/1904033/+attachment/5433812/+files/IMG_20201112_145251519.jpg

** Changed in: linux (Ubuntu)
       Status: New => In Progress

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Bug watch added: Linux Kernel Bug Tracker #210175
   https://bugzilla.kernel.org/show_bug.cgi?id=210175

** Also affects: linux via
   https://bugzilla.kernel.org/show_bug.cgi?id=210175
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1904033

Title:
  5.10-rc1+ sdhci crash due to commit
  e0d072782c734d27f5af062c62266f2598f68542

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  In Progress

Bug description:
  Booting 5.10-rc1+ on a Synquacer ARM64 development box crashes.
  Bisected this down to:

  commit e0d072782c734d27f5af062c62266f2598f68542 (HEAD, refs/bisect/bad)
  Author: Jim Quinlan <james.quin...@broadcom.com>
  Date:   Thu Sep 17 18:43:40 2020 +0200

      dma-mapping: introduce DMA range map, supplanting dma_pfn_offset

  
  Disabling the sdchi driver and/or removing this commit allows the kernel to 
boot without the crash.

  Attached is a photo of the crash.

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