Hi,
I'm trying to make USB driver work on my MPC8272 with kernel 2.6.21.
The driver detects properly the root hub (the embedded controller), but
when it tries to communicate with a device, the system seems to hang.
I have debugged the kernel and what I can see is that, once the
processor tries to send a buffer of the USB controller, interrupts get
disabled. And so, there is no ethernet, serial port, or whatever way of
communication to the processor. With my debugger I can see that the
kernel keeps running and executing cpu_idle() and so on. Furtheremore,
jiffies increase, but no other interrupts occur.
Has anyone experienced a problem like this?
It seems to happen when buffers try to access external memory. Can it be
related to bus arbitration?
Regards,
David
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