Question regarding mpic_assign_isu() in storcenter.c

[Eric Witcher]

The answer is that mpic_assign_isu(mpic, 1, paddr + 0x11000) places the initial base register
for isu 1 on a reserved location in the PIC register map (see *).  I guess you can infer from this
that no badness occurs when you write to a reserved location on the PIC.

That aside, when you walk through mpic_init(), the resulting vector placement as a result of
the mpic_assign_isu() calls are consistent with the corresponding device tree.

isu     vector     register_offset     pic           device_tree (storecenter.dts)
0       0          0x10200             INT0/Serial 0
0       1          0x10220             INT1/Serial 1
0       2          0x10240             INT2/Serial 2
0       3          0x10260             INT3/Serial 3
0       4          0x10280             INT4/Serial 4
0       5          0x102A0             Serial 5
0       6          0x102C0             Serial 6
0       7          0x102E0             Serial 7
0       8          0x10300             Serial 8
0       9          0x10320             Serial 9
0       10         0x10340             Serial 10
0       11         0x10360             Serial 11
0       12         0x10380             Serial 12
0       13         0x103A0             Serial 13
0       14         0x103C0             Serial 14
0       15         0x103E0             Serial 15

1       16         0x11000             Reserved*
1       17         0x11020             I2C           i2c at 3000
1       18         0x11040             DMA 0
1       19         0x11060             DMA 1
1       20         0x11080             Reserved
1       21         0x110A0             Reserved
1       22         0x110C0             Message unit
1       23         0x110E0             Reserved 
1       24         0x11100             Reserved
1       25         0x11120             DUART 1       serial0
1       26         0x11140             DUART 2       serial1
1       27         0x11160             Reserved
1       28         0x11180             Reserved
1       29         0x111A0             Reserved
1       30         0x111C0             Reserved
1       31         0x111E0             Reserved