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Re: BREAK and magic SysRq handling for Z8530

To: "Gleb O. Raiko" <>
Subject: Re: BREAK and magic SysRq handling for Z8530
From: "Maciej W. Rozycki" <>
Date: Wed, 9 Aug 2000 11:38:37 +0200 (MET DST)
Cc: Ralf Baechle <>, Harald Koerfgen <>, Craig P Prescott <>,,
In-reply-to: <>
Organization: Technical University of Gdansk

> Have you tested the patch? The problem isn't in the patch itself, but as

 Sure I did, to an extent I was able to.  No problems noticed.

> I see the zs driver is broken for a long time. At least, I used to patch
> heavily this driver for my Baget taht has 2 zs chips on board. Harald

 Well, the driver seems to work good enough for now to use a serial
console.  And the SysRq support is an absolute must when trying to debug a
locked-up kernel -- the lack of this support is a sign for me nobody is
currently working on DECstations at the moment. 

> has the plans to implement new version of the driver, but I guess he is
> busy all the time. Or have I missed a cleanup of the driver ?

 Hmm, I haven't noticed any, either.  Fixing the driver is actually on my
TODO list -- all the 8530 drivers present in Linux currently need to be
merged into a single one.  Also DMA and synchronous mode support has to be
implemented.  It's not on the top of my list, though.

> Also, changes in sunkbd.c, keyboard.c, and serial.c isn't a good idea.
> :-)

 It's actually the reverse. ;-)  Without these (oh well, sunkbd.c is for
completeness, indeed) you cannot compile-in the magic SysRq support if you
do not include the virtual terminal driver.  This is an unnecessary
limitation -- I don't want the VT (well, actually I would, if I had a
driver for my console, but I haven't, yet). 

 Such changes actually went into the Linus' 2.4.0-test6-pre* (but not mine
-- someone overtook me, and he also missed one bit ;-) ).


+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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