2009-02-06 03:46:37 Sd card hotplug problem

Bill Xie (CHINA)

Message: 68955

Hi:

1. If the sd card insert before board power on,It is ok.But kernel cannot catputed card removed.

root:/bin> cat /proc/spi_mmc

Driver build date: Jan 7 2009

SCLK: 20000 KHz

SPISEL41 as chip select

Driver: Blackfin PIO SPI directly

Total errors: 0

SD card :

Capacity: 1017643008 B

Name: SD ?

Rev: 9.1

Date: 2003/8

Serial: 0xed560 (972128)

CSD ver.: 0

CCC supported: 5f5

Mult. block writes works: YES

if the sd card is removed,the kernel is not captured this message.

oot:/bin> cat /proc/spi_mmc

Driver build date: Jan 7 2009

SCLK: 20000 KHz

SPISEL41 as chip select

Driver: Blackfin PIO SPI directly

Total errors: 0

SD card :

Capacity: 1017643008 B

2.If board power on before SD card insert,It cannot detect sd card.

The uclinux hotplug is enble.

Bus options (PCI, PCMCIA, EISA, MCA, ISA) --->

[*] Support for hot-pluggable device

BusyBox --->

Linux System Utilities --->

[*] mdev

[*] Support loading of firmwares

Let me know your suggestion to resolve this problem.Thank you.

Bill

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2009-02-06 13:23:45 Re: Sd card hotplug problem

Frank Van Hooft (CANADA)

Message: 69002

I don't know if this is of any help to you...

On our BF537 board with SD, we have the SD "card detect" line attached to a GPIO. Within our application code we keep an eye on that GPIO, so that if the card is removed or inserted, we can respond accordingly.

So we're not asking the kernel to handle card detect / removal, we're simply monitoring it ourselves.

Like I said, I don't know if that's of any help to you, but it works for us.

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2009-02-06 14:25:54 Re: Sd card hotplug problem

Tim Shearer (UNITED STATES)

Message: 69006

Works for us too. We poll our GPIO SD detect line, then run a mount script when the card is detected.

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2009-02-06 14:28:35 Re: Sd card hotplug problem

Tim Shearer (UNITED STATES)

Message: 69007

Incidentally, for anyone having comms problems when mounting their SD/MMC cards (on custom and CM-BF537E eval boards), check you're using 100R termination resistors on all data lines, and pullups in the appropriate places.

Use the Rubico stamp expansion board schematic as a reference if in doubt.

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2009-02-07 03:09:26 Re: Sd card hotplug problem

Bill Xie (CHINA)

Message: 69017

Hi,thank you.Your way by GPIO to decect sd card removed or insert.But I don't know how to realize this way by software.

Please help me to solve this problem . Thanks.

--Bill

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2009-02-08 23:17:00 Re: Sd card hotplug problem

Yi Li (CHINA)

Message: 69052