Date: Fri, 22 Mar 1996 08:57:33 -0700 From: Eric Varsanyi <ewv@boom.bsdi.com> To: Juha Inkari <inkari@snakemail.hut.fi> Cc: lyndon@orthanc.com (Lyndon Nerenberg VE7TCP), freebsd-hardware@freebsd.org Subject: Re: 3c590 Message-ID: <199603221557.IAA07807@boom.vars.com> In-Reply-To: Your message of "Fri, 22 Mar 1996 11:41:27 %2B0200." <199603220941.LAA23453@lk-hp-20.hut.fi>
next in thread | previous in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Content-Type: text/plain; charset=us-ascii > >> have the problem. (Anything after revision A boards should be fine. >> Mine are revision C.) > >> The bug is documented in the _PCI/EISA Bus-Master Adapter Driver >> Technical Reference_ (3COM part number 09-0681-001A). > >Thanks. My card says it's: >3C590C > ^ >03-0046-001 REV D > ^^^ ^ > >The ^ marked are handwritten. Would this actually be a bug in the vx >driver, then ? 3COM changed their minds on this (after producing the tech manual)... the new party line is that you should install their S/W workaround. As far as I can tell they have no plans to fix this bug, no one I've heard of has a fixed card. The problem is that on 10mbit nets rx packets that overrun the FIFO may be silently corrupted (instead of dropped). Their recommended solution is quite complex but it basically keeps track of how full the FIFO has gotten and drops all packets that may have overrun the end. I implemented a simpler version of their fix in our driver, it was only a few lines of code. In general the size of the FIFO's on the broken cards is at least 32K so it doesn't hurt to reserve the top 6K for 'overrun protection'. - -Eric -----BEGIN PGP SIGNATURE----- Version: 2.6 iQCVAgUBMVLN7DxFdSMFRIw5AQH2HAQAkS8xU6xwosKUoTFdT1x4IfSRA5cojkuT 8xB6Vvw4qkvlaRwzI3Mcs0/rlhTS7zh1LBeGLzx3Fafhce89Fgi/bnDswTmowo3H TFDpOGbfil4+kKB663UG5WdwTd7NQSWJtwbBq7UMK7e3LO+saatHNFLdIrJ7fyMI CscgHcXSYV4= =BC2s -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199603221557.IAA07807>