AMD F19h Northbridge IO (NBIO)

[cyring]

• IOHC : IOHUB Core. The I/O crossbar.

• zencli dump

zencli smu 0x13b10044
[0x13b10044] READ(smu) = 0xffffffff (4294967295)
   60   56   52   48   44   40   36   32   28   24   20   16   12   08   04   00
 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111 1111

zencli smu 0x13c10044
[0x13c10044] READ(smu) = 0xffffffff (4294967295)
   60   56   52   48   44   40   36   32   28   24   20   16   12   08   04   00
 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111 1111

zencli smu 0x13d10044
[0x13d10044] READ(smu) = 0xffffffff (4294967295)
   60   56   52   48   44   40   36   32   28   24   20   16   12   08   04   00
 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1111 1111 1111 1111

zencli smu 0x13e10044
[0x13e10044] READ(smu) = 0x00000100 (256)
   60   56   52   48   44   40   36   32   28   24   20   16   12   08   04   00
 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000

==> 0x13e10044 ?

[cyring]

0x13e10044 is _nbio[3] which uses NB_BUS_NUM of value zero because NB_BUS_LAT is set.

The other _nbio[2:0] could be disabled because associated register is 0xffffffff