PROBLEM:  (BCSM61SW3)    (Patch ID: OSF440-145)
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This patch fixes an intermittent hang most commonly seen
on the DS10 workstation.  This hang occurs in the I2c code
where the timeout() system call is being used in a do-while busy loop
in routines wait_for_i2cfree() and wait_for_i2c_nointr().

PROBLEM: (BCPM91GPF) (PATCH ID: OSF440-555)
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This patch fixes DS10/DS20 performance problems introduced with the i2c driver 
by using thread blocking, rather than event_meout() and DELAY().