drivers/pci: enable upstream bridge forwarding - #19948
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PCI endpoints cannot perform memory transactions when a bridge in their hierarchy has memory forwarding or bus mastering disabled. Firmware may leave these bits clear when handing a device over after PXE boot. Enable both bits on every parent bridge before enabling the endpoint. Signed-off-by: raiden00pl <raiden00@railab.me> Assisted-by: Claude Code
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xiaoxiang781216
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Aug 24, 2026
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@raiden00pl please fix: |
xiaoxiang781216
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Aug 24, 2026
drivers/pci/pci.c: fix nxstyle issues Signed-off-by: raiden00pl <raiden00@railab.me>
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@raiden00pl @xiaoxiang781216 after all the jobs have completed successfully to solve this (job MSYS2) You need to Re-run failed jobs. |
simbit18
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Aug 24, 2026
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Summary
PCI endpoints cannot perform memory transactions when a bridge in their hierarchy has memory forwarding or bus mastering disabled. Firmware may leave these bits clear when handing a device over after PXE boot.
Enable both bits on every parent bridge before enabling the endpoint.
Impact
fix PCI issues on intel64 hw after boot with PXE
Testing
Intel NUC with I226 NIC. After PXE boot over I226, without this changes - card is dead