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sonic-buildimage/device/dell/x86_64-dellemc_n3248pxe_c3338-r0
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Aravind Mani 6c82346c3d [DellEMC] DMA errors are seen when loading bullseye kernel (#9641) 
Following errors are seen continuously on SMBus controller when loading bullseye kernel.

[ 273.643046] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 273.785784] DMAR: DRHD: handling fault status reg 2
[ 273.844072] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 273.986804] DMAR: DRHD: handling fault status reg 2
[ 274.045101] DMAR: [DMA Write] Request device [00:12.0] PASID ffffffff fault addr 0 [fault reason 05] PTE Write access is not set
[ 274.187789] DMAR: DRHD: handling fault status reg 2

root@sonic:~# lspci -s 00:12.0 -vv
00:12.0 System peripheral: Intel Corporation Atom Processor C3000 Series SMBus Contoller - Host (rev 11)

Issue was not seen in buster. 

Modified platform specific installer.conf to turn off io_mmu
2022-01-08 16:36:06 -08:00
..
DELLEMC-N3248PXE DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00
plugins DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00
default_sku DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00
installer.conf [DellEMC] DMA errors are seen when loading bullseye kernel (#9641) 2022-01-08 16:36:06 -08:00
led_proc_init.soc DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00
platform_asic Add platform_asic file to each platform folder in sonic-device-data based package (#8542) 2021-10-08 19:27:48 -07:00
pmon_daemon_control.json DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00
sensors.conf DellEMC: N3248PXE Initial platform commit (#8562) 2021-09-25 15:35:16 -07:00