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From: Sergey Listopad <psychosensor@gmail.com>
To: freebsd-stable@freebsd.org
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Subject: Serial port stops working after upgrade to 9-CURRENT
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After system upgrade from 8.2-CURRENT to 9.0-CURRENT serial port
(motherboard integrated) stops working.

FreeBSD ferma.loc 9.0-STABLE FreeBSD 9.0-STABLE #2: Fri Jan 20
15:50:06 EET 2012     root@ferma.loc:/usr/obj/usr/src-8/sys/RT  i386

> dmesg | grep -E '^uart[0-9]'
uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0

> grep uart /boot/device.hints
hint.uart.0.at="isa"
hint.uart.0.port="0x3F8"
hint.uart.0.flags="0x10"
hint.uart.0.irq="4"
#hint.uart.1.at="isa"
#hint.uart.1.port="0x2F8"
#hint.uart.1.irq="3"

> config -x /boot/kernel/kernel  | egrep 'uart|sio'
device  uart_ns8250
device  uart

Where can i search the problem?

-- 
S.Listopad