Date: Thu, 16 Oct 2008 15:48:50 -0700 From: steve@Watt.COM (Steve Watt) To: hackers@freebsd.org Subject: Re: [Doubt] Can a PCI device communicate with another PCI or other Message-ID: <200810162248.m9GMmocw007400@wattres.watt.com> In-Reply-To: <e6a0706a0810161130i6a3820fexf3afdbf28f81bd31@mail.gmail.com> References: <e6a0706a0810141132n1a1d1a9cn4a50ffc727640e13@mail.gmail.com> <20081015160522.04A824FEE1E@xroff.net>
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In <e6a0706a0810161130i6a3820fexf3afdbf28f81bd31@mail.gmail.com> mboxindia@gmail.com wrote: >I think a PCI device can communicate with another PCI device directly >without the intervention of the CPU. Absolutely. Happens a fair amount in embedded networking systems (among others). The host is responsible for enumeration and resource assignment, but once that's complete, any device on the bus can see all others. Whether that's useful depends rather heavily on the devices on the bus, obviously. TANSTAAFL applies, though, in that multiple initiators must be careful not to step on each others' accesses. -- Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.5" / 37N 20' 15.3" Internet: steve @ Watt.COM Whois: SW32-ARIN Free time? There's no such thing. It just comes in varying prices...
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