Re: Serial driver problems with 5.2-current

From: M. Warner Losh <imp_at_bsdimp.com>
Date: Wed, 31 Dec 2003 23:41:46 -0700 (MST)
Found problem, but no solution yet.  It turns out that the 3*FEM556
cards really don't like to be mapped where we're mapping them, or they
aren't turned on (can't really tell the two apart).  The non F version
(3CXEM556 and 3CCEM556B) that I tried work great at the same address,
so I suspect something is different between the cards.  Don't know if
we need turn on the serial card (like I think NetBSD does, must spend
more time reading their code), or if we need to map it in a different
location.  I have code in my sio driver that refuses to attach if it
reads back 0xff from the card (which for the iir register is
impossible for the 16550A if I read the datasheet right).

Warner
Received on Wed Dec 31 2003 - 21:42:04 UTC

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