sonic-buildimage/device/dell/x86_64-dellemc_n3248pxe_c3338-r0/installer.conf

CONSOLE_PORT=0x3f8
CONSOLE_DEV=0
VAR_LOG_SIZE=512
ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="intel_iommu=off"
DellEMC: N3248PXE Initial platform commit (#8562) Why I did it Added support for the device N3248PXE How I did it Implemented the support for the platform N3248PXE n3248pxe_unit_test_log.txt Switch Vendor: DellEMC * Switch SKU: N3248PXE * ASIC Vendor: Broadcom * SONiC Image: sonic-broadcom.bin How to verify it Verified the show platform commands 2021-09-25 17:35:16 -05:00			`CONSOLE_PORT=0x3f8`
			`CONSOLE_DEV=0`
			`VAR_LOG_SIZE=512`
[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 2022-01-03 10:47:13 -06:00			`ONIE_PLATFORM_EXTRA_CMDLINE_LINUX="intel_iommu=off"`