As soon as I build my kernel using the GART_IOMMU option (more than 3GB RAM), dhclient fails. It seems to be uli526x related. Log file sample using debug=1 attached. Reproducible: Always ASROCK 939DUAL-SATA2 motherboard
Created attachment 330948 [details] part of dmesg containing uli526x debug output
Created attachment 330950 [details] cat lspci -v lspci -n
Created attachment 330952 [details] kernel .config minus CONFIG_GART_IOMMU The almost exact non-working kernel config minus CONFIG_GART_IOMMU (removed in order to post to bugzilla)
Could you report it upstream?
Please report this upstream and link us to the upstream bug, thank you.