Package: linux-image-2.6.18-4-xen-amd64
Version: 2.6.18.dfsg.1-12etch2
It appears that the 2.6.18-4 kernel in Etch does not support 8250 serial
devices. I see the following messages in dmesg when I boot up:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
8250_pnp: Unknown symbol serial8250_unregister_port
8250_pnp: Unknown symbol serial8250_register_port
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
8250_pnp: Unknown symbol serial8250_unregister_port
8250_pnp: Unknown symbol serial8250_register_port
The devices are enabled in the BIOS and work correctly when running the
stock 2.6.18-4 kernel. When booting with that version, the relevant
dmesg lines look like:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
This appears to be a Xen issue, since Xen steals the ttyS* devices for
xencons. I found a reference to a possible fix here:
http://www.nabble.com/xen-console-question-t690692.html
As the server is at a remote data center with RS232 console being the
only available way to access it in the event of network problems, I'd
like to see the 8250/16550 driver re-enabled in the Xen kernel.
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