Hi Joe I As long as your passive heatsink with forced air cooling is able to comfortably dissipate 40W of heat from the fpga I see no problem with this idea.
Regards On 19 November 2012 22:13, <[email protected]> wrote: > Send casper mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > > https://calmail.berkeley.edu/manage/list/listinfo/[email protected] > > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of casper digest..." > > > Today's Topics: > > 1. Re: ROACH2 updates - uboot, kernel, romfs and tcpborphserver3 > (David MacMahon) > 2. Virtex 6 Heat Sink (Joe Greenberg) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 19 Nov 2012 09:33:30 -0800 > From: David MacMahon <[email protected]> > Subject: Re: [casper] ROACH2 updates - uboot, kernel, romfs and > tcpborphserver3 > To: Marc Welz <[email protected]> > Cc: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > Thanks, Marc, > > On Nov 19, 2012, at 6:42 AM, Marc Welz wrote: > > > It is possible to add to the bootargs variable (accidentally) by > > running a soloboot, interrupting it (or it failing) and then doing a > > saveenv. > > That sounds like something that might have happened. > > > >> setenv bootargs console=ttyS0,115200 > > > > Yup, that is what it should be - to check do a clearenv and then a reset. > > Running "strings u-boot-r2-rev1.bin | grep bootargs=" confirms that this > is indeed the default value. > > > > >> Another macro that seem superfluous is "rootpath=/dev/mtdblock1". The > rootpath macro is only used in the netboot macro where it is replaced by > the value from the DHCP server. Does defining rootpath explicitly provide > any benefit that I'm not seeing? > > > > It is vestigal: The platform port we based our port on has the > > rootpath in a separate #define in the uboot config (CONFIG_ROOTPATH - > > see the roach2 config above), which suggests it was/will/could be used > > in the code proper somehow - so I erred on the side of caution and > > kept it in there. But as it stands it seems used so if there are > > strong feelings I can remove it :) > > One reason for removing it is that it ends up in /proc/cmdline. Startup > scripts that parse /proc/cmdline might get confused (or need to be more > complicated) by having two rootpath= parameters there. > > Dave > > > > > ------------------------------ > > Message: 2 > Date: Mon, 19 Nov 2012 15:04:09 -0500 > From: Joe Greenberg <[email protected]> > Subject: [casper] Virtex 6 Heat Sink > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > We are planning to rack mount Roach 2 Cards with forced air cooling in > the ALMA Correlator. > > In this configuration, a passive heat sink on the Virtex 6 seems more > appropriate than the Fan based Vantec heat sinks. > > Does this seem an appropriate way to go? > > Has anyone operated Roach 2 boards with passive heat sinks before? > > Does anyone have any specific heat sinks to recommend? Vantec does not > seem to make passive heat sinks. > > Thanks, > Joe > > > > > End of casper Digest, Vol 60, Issue 27 > ************************************** > -- Vaughan Moss DBE SKA SA 3rd Floor, The Park Park Road Pinelands 7405 South Africa Tel: +27 (0)21 506 7363 Fax: +27 (0)21 506 7375 Email: [email protected] Web: www.ska.ac.za
