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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 08-22-2011, 11:17 PM   #1
Jeach
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Getting Some problem of Emmc when I test my development board


My development board is imx508 ARM2 platform.This platform use the EMMC(SanDisk SDIN5C1-4G) as the boot device and storage device.I got some problem when I test it.

1.It take quite a long time when resume the system,about 145ms.That is unnormal.I have found out that the time is spent in mmc_init_card/mmc_sd_init_card(file:driver/mmc/core/mmc.c;driver/mmc/core/sd.c).But I don't know why,and I no sure the problem,driver,chip,hardware???

2.Sometime the device got a log like this:
mmcblk0: retrying using single block read
This may influences the system performance.And there is some way to get things done.

I hope someone give some suggest,Thanks first and Best Regards!
 
Old 08-24-2011, 03:09 PM   #2
nini09
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What's EMMC reset time?
 
Old 08-24-2011, 09:37 PM   #3
Jeach
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Quote:
Originally Posted by nini09 View Post
What's EMMC reset time?
The Emmc take about 143 ms when resume the system.That is unnormal.I think 50ms is the normal time.
 
Old 08-25-2011, 02:02 PM   #4
nini09
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Does it reset EMMC chip when mmc_init_card/mmc_sd_init_card is invoked?
 
  


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