mpcib, mpcih, and mpciw subcommands
The mpcib (modify PCI byte), mpcih (modify PCI halfword), and mpciw (modify PCI word) subcommands write data to the PCI Configuration Space.
Format
mpcib Bid PCIslot RegOffset
mpcih Bid PCIslot RegOffset
mpciw Bid PCIslot RegOffset
Parameters
| Item | Description |
|---|---|
| Bid | Identifies the Bus Identifier of the PCI bus. |
| PCIslot | Combines the device number on the PCI bus and
the function number on that PCI slot. The combinations uses the following
formula: |
| RegOffset | Identifies a zero-based byte offset of the register to read in a PCI Configuration Space. |
These commands are interactive and each modification is entered one-by-one. The first unexpected input stops modification. A period (.), for example, can be used to indicate the end of the data.
Other
No aliases.
Examples
The following is an example of how to use the mpcib, the mpcih, and the mpciw subcommands:
KDB(0)> businfo //get PCI bus id
********** PCI BUSES ***********
ADDRESS BID BUS_NUM PHB_UNIT_ID REGIONS
30043400 900000C0 00000000 00000000FEF00000 00000004
30043500 900000C1 00000040 00000000FEE00000 00000002
********** OTHER BUSES ***********
ADDRESS BID BUS_NUM PHB_UNIT_ID REGIONS
00459AE0 90000040 00000000 0000000000000000 00000001
00459F60 90000100 00000000 0000000000000000 00000002
0045AB60 90000300 00000000 0000000000000000 00000001
KDB(0)> dpciw 900000c0 80 10 //display word of data
00008010: 01F0FF00
KDB(0)> mpciw 900000c0 80 10 //modify word
00008010: 01F0FF00 = ffffffff
00008014: 00A010C0 = .
KDB(0)> dpciw 900000c0 80 10 //display new word of data
00008010: E1FFFFFF
KDB(0)> mpciw 900000c0 80 10 (reset word)
00008010: E1FFFFFF = 01F0FF00
00008014: 00A010C0 = .
KDB(0)> dpciw 900000c0 80 10 //display reset word
00008010: 01F0FF00
KDB(0)> mpcib 900000c0 80 10 //modify specifying bytes
00008010: 01 = ff
00008011: F0 = ff
00008012: FF = ff
00008013: 00 = ff
00008014: 00 = .
KDB(0)> dpciw 900000c0 80 10 //display new word of data
00008010: E1FFFFFF
KDB(0)> mpciw 900000c0 80 10 //reset word
00008010: E1FFFFFF = 01F0FF00
00008014: 00A010C0 = .
KDB(0)> dpciw 900000c0 80 10 //display reset word
00008010: 01F0FF00
KDB(0)> mpcih 900000c0 80 10 //modify specifying halfwords
00008010: 01F0 = ffff
00008012: FF00 = ffff
00008014: 00A0 = .
KDB(0)> dpciw 900000c0 80 10 //display new word of data
00008010: E1FFFFFF
KDB(0)> mpciw 900000c0 80 10 //reset word
00008010: E1FFFFFF = 01F0FF00
00008014: 00A010C0 = .
KDB(0)> dpciw 900000c0 80 10 //display reset word
00008010: 01F0FF00
KDB(0)>