Date: Tue, 21 Jul 2015 18:12:17 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 200744] serial driver issue under dell r220 Message-ID: <bug-200744-8-JDmY7JG8nW@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-200744-8@https.bugs.freebsd.org/bugzilla/> References: <bug-200744-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200744 --- Comment #3 from paul@ifdnrg.com --- This was due to an ACPI bug in r220's Marcel Moolenaar provided me with a fix which is: -BIOS- Serial Communication <On with Console Redirection via COM2> Serial Port Address <Serial Device1=COM2,Serial Device2=COM1> External Serial Connector <Serial Device 1> -FreeBSD- adding the following line to /boot/loader.conf: hw.uart.console="io:0x2f8,br:57600" ..... >From the looks of it, you have a BIOS bug. In particular a bug in the ACPI AML (you can dump the ACPI AML with acpidump -d). If I understand it correctly then the first 2 serial devices (UAR1 and UAR2) have the same H/W registers. What this boils down to is that the kernel only works with 1 serial port (UAR1), which ends up having the H/W configuration of the second serial port (UAR2). With the BIOS redirecting to COM1 (which is H/W address 0x3f8) and serial device 1 assigned to COM1 *and* serial device assigned to the serial port on the chassis, the kernel had no chance to present a login prompt. I worked around the problem by reconfiguring the BIOS so that COM2 (which is H/W address 0x2f8) is assigned to serial port 1 and the BIOS redirecting to COM2. What this does is have COM2 connected to the serial port on the chassis. So, even though I suspect that the kernel thinks it’s talking to the first serial port, it’s actually talking to the second serial port (due to the ACPI/BIOS bus). -- You are receiving this mail because: You are the assignee for the bug.
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