Mangoh Yellow SD Card not working

mangOH Yellow
1

Hi,

I am trying to mount an SD Card in the uSD slot on the mangoh yellow. I have the SD Card formatted and installed. I have SDIO_SEL2 (SW8) switched on per the HW architecture doc. I have rebooted the module. there is no mmc device showing up in /dev and i don’t see any entries in dmesg that indicated a device is being detected. hopefully i am missing something trivial to get this working.

2

Has anyone had a chance to look at this? anything obvious i am missing?

3

I’m using an SD card in the mangOH yellow. I’ve found that it’s really picky about the brand and type of SD card used. I’ve had good luck with Kingston class 4 cards. I haven’t gotten a single SanDisk card to work at all – they always error out with “mmc0: error -110 whilst initialising SD card”.

I don’t think you have to change any switches on the board. According to the schematic, the SD card being inserted automatically chooses it through the switch.

I think on stock mangOH firmware you have to do modprobe sdhci-msm, but my custom build of the firmware has that module built into the kernel instead.

6

@dougbrown, @tlistoe

Running down the same crap.
Thought I could insert:
insmod /lib/modules/3.18.140/kernel/drivers/mmc/host/sdhci-msm.ko (or)
modprobe sdhci-msm
into “/etc/modules” or somesuch and have the driver load on every boot.

But it’a a no-go. You guys know where this should be placed to be executing during the boot script?

Thanks

7

Hey,

Yeah I don’t know if my current solution is ideal as it’s a bit of a bodge to get some proof of concept stuff going.

  1. Make a shell script that gets bundled with an app and stored as executable using the bundle section in the Component.cdef file. In that script you run the modprobe sdhci-msm command

  2. write an app which runs a system command to execute the script from 1. You need to make sure you use the absolute path.

-T

8

List of compatible SD cards for mangoh that we tested are here: