From: Ronald G Minnich <rminnich@lanl.gov>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: [9fans] usb questions
Date: Wed, 8 Mar 2006 10:08:56 -0700 [thread overview]
Message-ID: <440F0FA8.6080903@lanl.gov> (raw)
I'm looking at usb and trying to understand something. I have two
systems that only have BARs for memory mapped IO for the USB controllers
(i.e. they are memory BARs, not I/O BARs). As I read the usbuhci code,
it appears that the controller only gets added if BAR[4] has a valid I/O
address; on these controllers it is always zero. I am about to kill a
tree and print the spec, but am wondering what's up here -- why does
plan 9 kernel only add a controller if it has an I/O address?
ron
next reply other threads:[~2006-03-08 17:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-08 17:08 Ronald G Minnich [this message]
2009-01-19 3:33 cinap_lenrek
2009-01-18 20:31 ` Francisco J Ballesteros
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