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<H1>[Mageia-discuss] UEFI and Secure Boot</H1>
<B>andre999</B>
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TITLE="[Mageia-discuss] UEFI and Secure Boot">andre999mga at laposte.net
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<I>Thu Aug 23 14:38:27 CEST 2012</I>
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<PRE>Morgan Leijström a écrit :
><i> onsdagen den 22 augusti 2012 21.43.07 skrev Rene Rasmussen:
</I>>><i> On Wed, 22 Aug 2012 19:51:31 +0100, Maurice Batey wrote:
</I>>>><i> On Wed, 22 Aug 2012 18:35:09 +0100, Anne Wilson wrote:
</I>>>>><i> To be honest, I'm not competent to start replacing chips on
</I>>>>><i> a RAM board, either.
</I>>>>><i>
</I>>>><i> It's a bit scary the first time, but if you follow one of the
</I>>>><i>
</I>>>><i> really helpful video clips out there on the 'net, it's not a big
</I>>>><i> deal.
</I>>>><i>
</I>>>><i> The main importance (apart from using the correct chip!) is to keep
</I>>>><i> your fingers from direct contact with the chip, to avoid any static
</I>>>><i> charge jumping across.
</I>><i>
</I>><i> To this point i do not fully agree; Metal tools give much stronger discharge
</I>><i> than fingers. But a reason to avoid toucing is to avoid contaminating around
</I>><i> pins with sweat (salt, acid), fat and other dirt.
</I>><i>
</I>><i> I have conductive plastic pliers for component handling, but they do not have
</I>><i> such firm grip as metal pliers.
</I>><i>
</I>><i> Then there are more expensive metalpliers with conductive plastic handles
</I>><i>
</I>><i> (conductive in this case means very very sightlyu conductive not measureabla
</I>><i> using standard multimeter, as it should avoid hard discharge, - just slowly
</I>><i> bleed away the charge)
</I>><i>
</I>><i> None of the options described is as important as avoiding charges to build up.
</I>><i>
</I>><i> In my workshop (i build electronics prototypes) i avoid clothes of synthetic
</I>><i> fabric, wear conductive slippers - if any, have conductive carpet, and
</I>><i> conductive mat on the relevant tables. But those are expensive is sold as
</I>><i> such. I have measured some cheaper rubber mats are good too.
</I>><i>
</I>><i> The less expensive approach is to use a wristband.
</I>><i> A plus is to avoid sunthetic clothing, and you could work on such pink bubble
</I>><i> palstic wrapping some electronics come with, it is antistatic. Avoid metal
</I>><i> and plastic table, prefer untreated wood.
</I>><i>
</I>>><i>
</I>>><i> Or set up an anti-static workplace. That would be the correct thing to
</I>>><i> do.
</I>>><i> Static discharges are probably responsible for 90% of all electronics
</I>>><i> going bad.
</I>><i>
</I>><i> (not counting design errors. My favourite complaint is that designers put
</I>><i> eletrolytics unecerrarily close to hot components - the most common repair we
</I>><i> do is to replace such.)
</I>><i>
</I>><i> ESD damages are not always immediately noticeable, but often age the component
</I>><i> so it have less life left (simply speaking)
</I>><i>
</I>>><i> I never touch any of my computer or electronics parts without my ESD
</I>>><i> wristband securely connected to my workspace.
</I>>><i> (having worked with electronics professionally for most of my life has
</I>>><i> taught me that!)
</I>
Sounds like good advice for 20 or 30 years ago, before chips normally had
tristate buffers and a common floor covering was those polyestre carpets which
were so good for rubbing your feet on so you could give an unsuspecting victim
a shock by touching them.
Chip technology has advanced enormously. Much circuitry is wave-soldered to
the process board, thus even more immune to static discharge and dirt.
And those cheap static-producing carpets are a lot rarer.
Single chips with delicate pins are also a lot rarer.
Static charge is more likely to disrupt a functioning system, rather than cause
any physical damage.
I'd say the biggest risk to electronics today is damaging a process board by
flexing it too much.
I'd prefer a soft cardboard surface to anything else. (Protects both the
surface beneath and the electronics, and doesn't create a static charge.)
>><i>
</I>>><i> regards,
</I>>><i> Rene
</I>>><i>
</I>
--
André
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