Date: Wed, 23 Apr 1997 17:55:24 -0600 From: Brett Glass <brett@lariat.org> To: Peter Dufault <dufault@hda.com> Cc: torstenb@ramsey.tb.9715.org, dufault@hda.com, gurney_j@resnet.uoregon.edu, hardware@freebsd.org Subject: Re: Yet another Adaptec 2940UW problem :( Message-ID: <3.0.1.32.19970423175524.006f61c4@lariat.org> In-Reply-To: <199704232322.TAA01712@hda.hda.com> References: <3.0.1.32.19970423101930.006a67b4@lariat.org>
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At 07:22 PM 4/23/97 -0400, Peter Dufault wrote: >Right - I believe only the 1542 can do what you want. According to their Web site, this is a bus mastering *ISA* adapter, which means you can't transfer data to or from just anyplace in RAM. Does the target driver use the OS's "bounce buffer" hack, or would I have to work around this myself? Also, the adapter is claimed to transfer up to 10 MBps. I know of no ISA adapter that actually goes this fast! Is there something that uses a faster bus interface? I'd like to be able to serve data faster, at least for some transfers. >You don't configure a >pt device you configure an "sctarg" device. Getting a 1542 may be >a way to prototype. Well, ultimately, the machine may be replicated a few hundred times, so I'd like something I could use for "production" as well as prototyping. Is there a reason (other than the bus interface) that the board might be unsuited for production application? If the drivers only support target mode on this one adapter, is there a register-compatible model from another manufacturer that runs faster, has a better bus interface, or is perhaps Fast/Wide or Ultra? I know that BusTek used to have adapters that were register-compatible with Adaptec, but don't know if they have kept this up in more recent models on faster buses. --Brett
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