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News: Glomation introduced new wireless ready low cost GESBC-9260S
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Read March 20, 2009, 12:23:00 PM #0
aaronpaulhughes

Are MMC cards supported?

I noticed when I plugged in a USB drive (thumb drive), that various debug information was displayed on the console. I was then able to mount it with mount -t vfat /dev/sda1 /mnt/usb (note I had to make the usb directory with mkdir /mnt/usb)

Now I have plugged in an old 16MB MMC card (i.e. 8 pins and thinner than SD cards that have 9 pins). I didn't notice any information on the screen indicating that the board had detected it. I also played around with trying to mount it but no luck.

So
1. Are MMC cards supported?
2. How does one mount them?

Thanks.
 
Read March 20, 2009, 12:47:54 PM #1
admin

Re: Are MMC cards supported?

0 ohm resister R191 and R193 must be installed and R192 must be removed to use MMC card.  They can be mounted the same way as SD card.
 
Read March 20, 2009, 03:15:39 PM #2
aaronpaulhughes

Re: Are MMC cards supported?

Could you reply with a schematic please? I'm curious as to why there is a HW change needed for MMC support.
 
Read March 30, 2009, 11:12:13 AM #3
aaronpaulhughes

Re: Are MMC cards supported?

Could you reply with a schematic please? I'm curious as to why there is a HW change needed for MMC support.

Three questions
1. How do I mount a regular SD card?
2. If I modify the board (resistor mod as you described), will *both* MMC and SD cards work in the same slot?
3. Why is the resistor mod even needed?

Thanks,
Aaron
 
Read April 08, 2009, 06:56:05 PM #4
aaronpaulhughes

Re: Are MMC cards supported?

Could you reply with a schematic please? I'm curious as to why there is a HW change needed for MMC support.

Three questions
1. How do I mount a regular SD card?
2. If I modify the board (resistor mod as you described), will *both* MMC and SD cards work in the same slot?
3. Why is the resistor mod even needed?

Thanks,
Aaron

Below doesn't work. I don't have that much time to devote to trouble shooting this. Can somebody explain to me please how to mount an SD card?

/ # ls /dev/mmc*
/dev/mmc0       /dev/mmc1       /dev/mmcblk0    /dev/mmcblk0p1
/ # mount -t vfat /dev/mmc0 /mnt/sdcc
mount: mounting /dev/mmc0 on /mnt/sdcc failed: No such device or address
/ # mount -t vfat /dev/mmc1 /mnt/sdcc
mount: mounting /dev/mmc1 on /mnt/sdcc failed: No such device or address
/ # mount -t vfat /dev/mmcblk0 /mnt/sdcc
mount: mounting /dev/mmcblk0 on /mnt/sdcc failed: No such device or address
/ # mount -t vfat /dev/mmcblk0p1 /mnt/sdcc
mount: mounting /dev/mmcblk0p1 on /mnt/sdcc failed: No such device or address
/ #


 
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