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Headsup: usb serial console support on x86
Date: Wed, 14 Jun 2006 09:06:44 -0700 (PDT)
From: Shudong Zhou <szhou at billybob dot sfbay dot sun dot com>
To: on-all at sun dot com, onnv-gate at onnv dot eng dot sun dot com
Subject: Headsup: usb serial console support on x86
With the putback for
6426010 Need ability to direct console to USB serial device
you may direct Solaris x86 console to a usb serial device (useful
for laptops without built-in serial connector). The functionality
is not documented for end users, due to the lack of BIOS and
early boot support.
To enable it, run
# eeprom console=usb-serial
and reboot. Or, edit the GRUB menu to have
kernel ... -B console=usb-serial
Here are a few things to know with usb serial console.
- Runtime kmdb (mdb -K) is available, but boottime kmdb isn't.
- kmdb depends on polled I/O, which works for uhci+usbsprl.
Support for other devices will come later.
- Output is available after kernel driver attaches.
Early boot messages are saved in a buffer and flushed
when console is available.
Comments and suggestions are welcome.
Shudong
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