[DragonFlyBSD - Bug #2342] revert Completely remove DFLTPHYS? oversized DMA transfer attempt 131072 > 65536

[David Shao via Redmine]

Issue #2342 has been reported by David Shao.

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Bug #2342: revert Completely remove DFLTPHYS?  oversized DMA transfer attempt 131072 > 65536
http://bugs.dragonflybsd.org/issues/2342

Author: David Shao
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


On an older Pentium 4 Asus P4B266 machine (ICH2), something approximating bisection indicates that commit d83666e0134c4fe447b61f17ca7f22f4418b2d9b "Kernel - Completely remove DFLTPHYS" appears to result in boot failing with error messages such as:

ata0: FAILURE - oversized DMA transfer attempt 131072 > 65536
ad1: setting up DMA failed

Booting appears to be successful on newer Intel based machines using say ICH7 or ICH10  set hw.apic_io_enable=0 was already a requirement for booting on this ICH2 machine with post 2.10 kernels.


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