Yes, it really seems like this is a new bug somewhere.
I happen to have a logic analyzer hooked up to the UTMI interface in my
device, so I can see what is happening. This happens in high speed
mode, and my device made the mistake that it sent 7 data bytes of the
device descriptor instead of the requested 8.
Everything else is fine(CRC, PID,etc).
The mac ACK's, and then sets the address normally, to which my device
responds correctly.
However, the mac then goes into a very strange infinite loop, sending:
SETUP
DATA0(empty)
SETUP
DATA1(empty)
over and over again. My device is ACK'ing the data packets. The mac
seems to send this forever, and when I plug any device in again I get
nothing on the port. I have to reboot in order for the port to work
again.
Also, I looked in the apple discussion forums for the powebook and
other people seem to have problems with their USB ports on this machine
as well.
I'm fixing my core to get that lost byte for the device descriptor, but
still i don't see how that will cause that infinite loop. The other
hosts i have just retry to get the descriptor a few times and then
quit.
Cheers,
Juan
On Feb 23, 2005, at 11:25 AM, David Ferguson wrote:
Ouch! That sounds like a problem we may need to look at. It's
possible it's already fixed for future OS releases. As you can
imagine error handling during enumeration failures can be difficult to
test (unless you have a device failing enumeration!). Is the port
only "stuck" at one speed? (ie, Hi-speed doesn't work, but
Full-speed/Low-speed does?)
There are no significant differences in HW with your new 17"
Powerbook, but the software could be different.
Regards,
David Ferguson
USB Software Team
Apple Computer
At 10:53 PM -0500 2/22/05, Juan Pablo Pertierra wrote:
I am developing a high speed device which will work primarily with
macs. I have been using as test hosts a PC and my old powerbook 17"
1.33Ghz. Whenever there was any problem in negotiation or
setup/enumeration, i could just unplug the device, fix the bug and
the plug it back in and the computer attempted to enumerate as
normal. This is also the way it works with the PC.
However, I just purchased a new powerbook 17" 1.67Ghz. Now, whenever
my device does not respond correctly or there is any problem in
enumeration, when i disconnect the device and connect it again, the
port is 'frozen' and doesn't do anything at all. I've tried other
devices and port will not work with anything. I have to reboot the
entire system for it to work again.
I've tried the exact same device on the PC, and it has no problem
attempting enumeration again simply by unplugging it and plugging it
back in.
Are there any changes in the hardware/software of this new powerbook
that could cause this? I had the latest upgrade of OSX on my old
powerbook, i was under the impression that the software is the same
on this machine. Maybe the USB controller/phy are different now?
Thanks!
Juan
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