Date: Sat, 25 May 2013 00:12:05 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: =?utf-8?B?V2Vpw58sIErDvHJnZW4=?= <weiss@uni-mainz.de> Cc: "'freebsd-current@freebsd.org'" <freebsd-current@freebsd.org> Subject: Re: Intel D2500CC motherboard and strange RS232/UART behavior Message-ID: <682782182.20130525001205@serebryakov.spb.ru> In-Reply-To: <D6240E9DA4CE444399B1D9D8A57CBDD988DA22A6@E14MDB-02.zdv.Uni-Mainz.DE> References: <D6240E9DA4CE444399B1D9D8A57CBDD988DA22A6@E14MDB-02.zdv.Uni-Mainz.DE>
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Hello, J=C3=BCrgen.
You wrote 24 =D0=BC=D0=B0=D1=8F 2013 =D0=B3., 23:15:17:
WJ> According to the ACPI of the board, uart0 and uart 2
WJ> use IRQ 3 and
WJ> IRQ (Edge, ActiveLow, Shared, )
WJ> {3}
WJ> uart1 and uart3 use IRQ 4
WJ> IRQ (Edge, ActiveLow, Shared, )
WJ> {4}
WJ> ioapic_config_intr is called with trig =3D=3D INTR_TRIGGER_EDGE and
WJ> pol =3D=3D INTR_POLARITY_LOW.
WJ> The combinatation of Edge and ActiveLow seems kind of broken.
WJ> Forcing the polarity in ioapic_config_intr to INTR_POLARITY_HIGH
WJ> and disabling uart 2 and uart 3 results in two working serial
WJ> interfaces.
WJ> So what is the correct fix to this?
I've tried to disable ACPI access to these UARTs at all, then only
two of them are detected, but they don't work either. And I cannot
disable 2 and 3, as screen I have attached to this box (old IBM-made
LCD from register/cashier machine, which works perfectly with FreeBSD
default text console on this MoBo) cannot show text (!) BIOS setup
screen to me -- it shows only blue noise and looks like compeltely
out-of-sync. I need to bring this box to some other dispaly and try
to disable these two UARTs AND disable ACPI for them with loader
tunable.
--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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