On Jun 11, 2010, at 10:50 AM, Pyun YongHyeon wrote: >>>> >>>> I'm not clear why you even need bounce buffers for RX. The chip supports >>>> 64bit addresses with no boundary or alignment restrictions. >>>> >>> >>> Some controllers have 4G boundary bug so bge(4) restricts dma >>> address space. >> >> That limitation should be reflected in the boundary attribute of the tag, >> not the lowaddr/highaddr attributes. >> > > Yes, but that needed more code. And I don't have these buggy > controllers so I chose more simple way that would work even though > it may be inefficient.
Do you happen to know if one or both of the hardware I have access to is the "buggy" hardware? b...@pci0:32:2:0: class=0x020000 card=0x12a4103c chip=0x164514e4 rev=0x15 hdr=0x00 vendor = 'Broadcom Corporation' device = 'broadtcomBCM5701 Gigabit Ethernet (BCM5701)' class = network subclass = ethernet bar [10] = type Memory, range 64, base 0x90800000, size 65536, enabled cap 07[40] = PCI-X 64-bit supports 133MHz, 512 burst read, 1 split transaction cap 01[48] = powerspec 2 supports D0 D3 current D0 cap 03[50] = VPD cap 05[58] = MSI supports 8 messages, 64 bit b...@pci0:1:2:0: class=0x020000 card=0x1311103c chip=0x164814e4 rev=0x10 hdr=0x00 vendor = 'Broadcom Corporation' device = 'NetXtreme Dual Gigabit Adapter (BCM5704)' class = network subclass = ethernet bar [10] = type Memory, range 64, base 0xa0450000, size 65536, enabled cap 07[40] = PCI-X 64-bit supports 133MHz, 2048 burst read, 1 split transaction cap 01[48] = powerspec 2 supports D0 D3 current D0 cap 03[50] = VPD cap 05[58] = MSI supports 8 messages, 64 bit -- Marcel Moolenaar xcl...@mac.com _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"