Description of problem:

The i7300 memory controller supports an special single DIMM mode. On such mode, only the configuration for branch 0, channel 0 is valid. Unfortunately, some BIOSes seem to keep filling invalid data for the MTR registers for other branches/channels. As i7300_edac driver doesn't have any code to only get the DIMM info for branch 0, channel 0, that makes it to think that there are twice the memory than it should be.

Version-Release number of selected component (if applicable):

All Kernel versions with the i7300_edac driver.

How reproducible:

Always

Steps to Reproduce:
1. Boot the system
2. Look the EDAC sysfs nodes with the memory size
  
Actual results:

Twice memory is shown. On a machine equipped with a single 512MB DIMM, it detects:

EDAC DEBUG: print_dimm_size:               channel 0 | channel 1 | channel 2 | channel 3 |
EDAC DEBUG: print_dimm_size: -------------------------------------------------------------
EDAC DEBUG: print_dimm_size: csrow/SLOT 0   512 MB   |  512 MB   |    0 MB   |    0 MB   |


Expected results:

It should be discarding branch 1 and branch 0 channel 1 info if single mode is detected.