Ben Thomas
2006-May-31 14:03 UTC
[Xen-devel] [PATCH] Allow more dynamic use of serial lines with qemu by floating Summagraphic port
This patch allows more dynamic use of the qemu serial lines by allowing
the Summagraphics port to float. I''ve discussed this with
Don Dugger who did the Summagraphics work. This patch has no operational
effect on existing configurations, but allows more serial lines
to be used.
qemu will emulate up to 4 serial lines (COM1 - COM4). One of these
lines supports a Summagraphics protocol. This has changed recently,
and it''s now always COM2. This patch allows the user to specify
to qemu which lines should be serial lines, and the code will place
the Summagraphics compatible line at just above the last specified
serial line. qemu defaults serial line 0 (COM1) to be "vc", resulting
in the Summagraphics support residing on COM2. This is in keeping
with the current behavior.
The results, via qemu command line, are:
<none> COM2
-serial x COM2
-serial x -serial x COM3
-serial x -serial x -serial x COM4
-serial x -serial x -serial x -serial x <none>
The results are deterministic, and allow the use of up to 4 serial
lines including none with Summagraphics support. There is no
change from current behavior, unless requested.
Signed-off-by: Ben Thomas (ben@virtualiron.com)
--
------------------------------------------------------------------------
Ben Thomas Virtual Iron Software
bthomas@virtualiron.com Tower 1, Floor 2
978-849-1214 900 Chelmsford Street
Lowell, MA 01851
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