kern/167197: Use of SD card will increase the load of CPU.

Takashi Matsubara t-matubara at
Sun Apr 22 10:40:07 UTC 2012

>Number:         167197
>Category:       kern
>Synopsis:       Use of SD card will increase the load of CPU.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 22 10:40:06 UTC 2012
>Originator:     Takashi Matsubara
>Release:        FreeBSD9-STABLE
FreeBSD tamago-two.tamago.local 9.0-STABLE FreeBSD 9.0-STABLE #0: Sun Apr 22 15:08:51 JST 2012     matubara at tamago-two.tamago.local:/usr/obj/usr/src/sys/TAMAGO-TWO  amd64
If SD card is used,
The following error occurs and the load of CPU increases. 

sdhci0-slot0: Got AutoCMD12 error 0x0001, but there is no active command.

-pciconf -lv is -
sdhci0 at pci0:13:0:0:     class=0x080500 card=0x213317aa chip=0xe8221180 rev=0x01 hdr=0x00
    vendor     = 'Ricoh Co Ltd'
    device     = 'MMC/SD Host Controller'
    class      = base peripheral
    subclass   = SD host controller

Computer: Lenovo Thinkpad T510

Insert SD-card to hardware card controller
The following source code of head/-current is used. 



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