Frédéric BEGOU wrote :
Frédéric BEGOU wrote:
Hello,
For what I've seen on the Internet concerning your card, there is
only one MMC card reader.
Besides, there is the following piece of code :
+static struct twl4030_hsmmc_info mmc[] = {
+ {
+ .mmc = 1,
+ .wires = 4,
+ .gpio_cd = -EINVAL,
+ .gpio_wp = -EINVAL,
+ },
+ {
+ .mmc = 2,
+ .wires = 4,
+ .gpio_cd = -EINVAL,
+ .gpio_wp = -EINVAL,
+ },
+ {} /* Terminator */
+};
Maybe I am mistaken, but doesn't that mean there are two MMC cards ?
I am interested in the subject, as I am trying to write my own board
file for our custom, beagleboard-based card, with no success so far
concerning the second MMC reader...
Well, it seems that the board is question has a WIFI module connected
to the second mmc. What is your problem right now ? Remember that all
three MMC slots are different in what kind of voltage they can drive.
Hello,
OK I understand for your board.
I have my second MMC slot wired just like MMC1 : they are micro-SD slots
wired with
- MMC2_CLK
- MMC2_CMD
- MMC2_DATA0
- MMC2_DATA1
- MMC2_DATA2
- MMC2_DATA3 , all 6 wired with a 4.7Kohm resistor to VMMC2 ;
VDD wired to VMMC2 and VSS to ground.
Add a capacitor between VMMC2 and the ground for the taste !
VMMC2 is 3.3V.
I've tested with a different combination of parameters in the
twl4030_hsmmc_info structure in my board file, and now I'm stuck with
the following :
static struct twl4030_hsmmc_info mmc[] = {
{
.mmc = 1,
.wires = 4,
.gpio_wp = -EINVAL,
},
{
.mmc = 2,
.wires = 4,
.transceiver = 0,
.ext_clock = 0,
.cover_only = 0,
.gpio_wp = -EINVAL,
.gpio_cd = -EINVAL,
},
{} /* Terminator */
};
MMC1 works well, but no success for MMC2.
Does someone please have pointers to documentation, apart from the
twl4030_hsmmc_info structure header file ?
Thanks in advance.
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