#11472 NORM 1.75-so: Try out 8-bit bus width on eMMC

Zarro Boogs per Child bugtracker at laptop.org
Tue Nov 22 22:26:32 EST 2011

#11472: Try out 8-bit bus width on eMMC
           Reporter:  cjb        |       Owner:  Quozl        
               Type:  defect     |      Status:  new          
           Priority:  normal     |   Milestone:  1.75-software
          Component:  kernel     |     Version:  not specified
         Resolution:             |    Keywords:               
        Next_action:  never set  |    Verified:  0            
Deployment_affected:             |   Blockedby:               
           Blocking:             |  

Comment(by Quozl):

 Yes, the XO-1.75 C1 SKU201 persists in being faster.

 Tests with os12 kernel 3.0.0_xo1.75-20111118.1738.olpc.e3f6aac

 ||size of /dev/mmcblk0||7766016 blocks||7757824 blocks||
 ||read /dev/mmcblk0p1 65536 blocks||1.79s||3.3s||
 ||read /dev/mmcblk0p2 3704928 blocks||96s||172s||
 ||dmesg mmcblk0: mmc2:0001 ||008G4B 7.40 GiB||SEM08G 7.39 GiB||

 Both dmesg contain:
 mmc2: new high speed DDR MMC card at address 0001

Ticket URL: <http://dev.laptop.org/ticket/11472#comment:8>
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