#2322: Sandisk 8GB MicroSDHC locks up under stress
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Reporter: skliarie | Owner: openmoko-devel
Type: defect | Status: new
Priority: normal | Milestone:
Component: unknown | Version: unspecified
Severity: normal | Keywords:
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible:
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I have an Sandisk 8GB MicroSDHC card that works ok for small write
operations (a megabyte or less), but once I start to stress writing
buffers (e.g. cat /dev/zero > file), the SDHC locks up hard and following
error appears in dmesg:
<6>[ 9479.220000] glamo-mci glamo-mci.0: Error after cmd: 0x4120
<3>[ 9479.220000] mmcblk0: error -110 sending read/write command, response
0x0, card status 0x400900
The kernel is provided by the android-on-freerunner week-2009-44 (cat
/proc/version):
Linux version 2.6.29-rc3-mokodev (ser...@…) (gcc version 4.2.1) #1 PREEMPT
Sat Oct 24 16:06:35 CEST 2009
To fix that, I had to do the following:
cd /sys/module/glamo_mci/parameters/
echo 5000000 > sd_max_clk
echo 3 > sd_drive
After the change, the write speed is acceptable 2.800 MBytes/s. (using
uSD-USB adapter the write speed is 18MB/s).
Please fix the kernel to automatically downrate on such cards. (The
previous value of the sd_max_clk was 16666666).
Find attached dmesg of the kernel boot (grep glamo) with the SD card.
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Ticket URL: <https://docs.openmoko.org/trac/ticket/2322>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac
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