git: DragonFly_RELEASE_5_6 kernel - Enable busmaster on bridges (BIOS might not)
dillon at crater.dragonflybsd.org
Thu Aug 1 11:02:44 PDT 2019
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Thu Aug 1 10:51:55 2019 -0700
kernel - Enable busmaster on bridges (BIOS might not)
* BIOSes do not always enable busmaster on bridges. Make sure
busmaster is enabled on all bridges.
* Reproduced with an Asus X370-PRO (AM4) motherboard which was not
enabling busmaster on the bridges connecting either the motherboard
IGB or the quad IGB card installed in a slot, but only when booting
EFI. When booting legacy the BIOS did enable busmaster.
* The characteristics of the failure is that NICs fail to physically
transmit packets and received packets cannot be DMA'd into the rings,
causing the packet error counter to increment once the receive
hardware FIFO is full.
* Fixes EFI booting on some motherboards.
Summary of changes:
sys/bus/pci/pci_pci.c | 7 +++++++
1 file changed, 7 insertions(+)
DragonFly BSD source repository
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