Dual-USB Bifferboard SD card reader

[Balajti]

Hello all!

Sorry my english is bad.

Today arrived my Dual-USB Bifferboard.

I try to use the SD card reader but I not find any information about
it.
At the LuCI web interface i find a "MMC/SD driver configuration" menu
where there are technical questions about pinout, I not find the dual-
usb board pinouts, and the mode of card reader.
The asked ports :

Name
DI_pin
DO_pin
CLK_pin
CS_pin
Mode

I read this howto : http://sites.google.com/site/bifferboard/sd_mmc_howto
, but it is too difficult. I think if I set the LuCI it do the work
and the card reader work with only few clicks.

What is the mode and pins of the Dual-USB Bifferboard?
I must do the commands in the wiki, or enough to set the current
parameters in LuCI?

Thanks for your answer
István Balajti

[Andrew Scheller]

> Today arrived my Dual-USB Bifferboard.
>
> I try to use the SD card reader but I not find any information about
> it.
> At the LuCI web interface i find a "MMC/SD driver configuration" menu

[snip]

> I read this howto : http://sites.google.com/site/bifferboard/sd_mmc_howto

[snip]

Both the LUCI and the howto you linked to expect the SD card to be
connected directly to the CPU's GPIO pins. But that's not how the SD
card is connected in the dual-USB Bifferboard, which is why you can't
find the info you're looking for ;-)

As explained (not very well) on
https://sites.google.com/site/bifferboard/Home/2-port-bifferboard the
SD card slot is connected (via a GL827 chip and a PI3USB10
multiplexer) to the USB pins on the CPU. Which means if you put a
SDcard in the SDslot, it appears to the OS as a USB Mass Storage
device, *exactly* the same as if you'd put a normal USB flash stick
into the second USB port.
So as long as you've got the relevant kernel drivers for USB and USB
MassStorage, and your SD card's filesystem all loaded (can't remember
all the details off-hand), it should "just work" and will probably
appear as something like /dev/sda1 or /dev/sdb1

Lurch