Busy-waiting in ethernet_mac_miim_write()

GNU Radio
1

Hi,After a lot of testing/debugging (previously in thread “Firmware /
FPGA
bitstream for USRP2 Rev 4”) by using a re-compiled version of txrx.bin
from
the gnuradio firmware source code, I was able to find out where the
firmware
gets stuck:

Regardless of whether the usrp2 is connected to a machine or not, it
gets
stuck in the following loop in ethernet_mac_miim_write(). We verified
that
the firmware goes through the following sequence of code:

  1. main() (in txrx.c) calls ethernet_init() (in ethernet.c)
  2. ethernet_init() calls eth_mac_miim_write(PHY_INT_CLEAR, ~0) (in
    eth_mac.c)
  3. eth_mac_miim_write() gets stuck in :
    while((eth_mac -> miistatus & MII_BUSY) !=0)
    ;

Apparently, the hardware status is always seen as busy.

Any ideas on what might be wrong?

Thanks,
Omid

2

Hi,
I have the same problem with usrp2. Did you find out what was wrong?

Thanks,
Anna