On Sunday 30 July 2006 21:32, Dieter wrote: > > A boot-time video mode that's configurable in the field should be > > hardware-lockable, to permanently deny software and f irmware any chance > > to change it. > > IIRC, awhile back there was talk of a jumper to write-protect the > eeram/nvram/flash/whatever-they're-calling-it-this-week ?
That was on OGD1 (to protect the main FPGA configuration PROM), and I can't remember if there was a final decision on that one. In the event that a user-configurable area of non-volatile storage is included in the OGC1 chip, yes, having a write-protect jumper on the card seems like a good idea. It'll mean that people who do buy vendor-preconfigured boards can't mess up the settings quite so easily when they start playing with the X configuration tools. However, the other alternative is to have it as a flag you can only set using the JTAG interface. That'll save on adding extra components for infrequently-used functions. As Attila suggested, we've already got an general purpose interface on there -- all that's needed is to make the JTAG registers available. What about this component (or one like it) for the JTAG header? On the edge of the board, for easy access if you've got a number of cards in: http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?N=0&Ntk=I18NAll&Ntt=468-080 How to build & use a JTAG cable: http://wiki.openwrt.org/OpenWrtDocs/Customizing/Hardware/JTAG_Cable An example of a commercial JTAG cable: http://www.nuhorizons.com/products/digilent/jtag-cable.html Peter -- Fisher Society publicity officer http://tinyurl.com/o39w2 CUSBC novices, match and league secretary http://tinyurl.com/mwrc9 Quake II build tools maintainer http://tinyurl.com/fkldd v2sw6YShw7$ln5pr6ck3ma8u6/8Lw3+2m0l7Ci6e4+8t4Eb8Aen5+6g6Pa2Xs5MSr5p4 hackerkey.com
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