AM3352: AM335 failed to initial MMC2 with Spartlan Wifi

Rio Chan

Genius 14865 points

Part Number: AM3352

Tool/software:

Champs.

I can offer you the customer full schematic thru email.

The Wifi module of Sparklan is 3.3V

They are using MMC2 (HW Instance) for adapting the Sparklan Wifi.

But I suffer for 1 month, I cannot make the MMC2 with 3.3V.

May someone to help review the cust's DTS?

Thanks.

BR Rio

23 days ago

0 Bin Liu 23 days ago

TI__Guru**** 168631 points

Hi Rio,

Please allow me to look into this for a few days and get back to you.

0 Rio Chan 20 days ago in reply to Bin Liu

TI__Genius 14865 points

Hi Bin:

I have sent you the dts, and the schematic.

plz do help. thanks.

BR Rio

0 Bin Liu 19 days ago in reply to Rio Chan

TI__Guru**** 168631 points

Hi Rio,

[ 2.508112] mmc2: starting CMD52 arg 00000c00 flags 00000195
[ 2.515022] req: CMD52 R arg=0x00000c00 data=N
...
[ 2.531505] mmc2: req done (CMD52): -110: 00000000 00000000 00000000 00000000
[ 2.531512] [MMC mmc2] request_done1 mrq=ddbc9dfc cmd=52 err=-110 data_err=0 bytes=0

The kernel log shows the AM335x MMC2 controller sends CMD52 but doesn't receive its response from the WIFI device.

Can you first please put a scope on the MMC2 interface to see if there is any activity?

0 Rio Chan 19 days ago in reply to Bin Liu

TI__Genius 14865 points

Hi Bin:

#1. Yes, you are right, we are checking the HW schematic at the meantime.

#2. You can review our DTS setting according the schematic first.

BR Rio

0 Bin Liu 18 days ago in reply to Rio Chan

TI__Guru**** 168631 points

Hi Rio,

The U-Boot is v2014.07 and kernel is v4.1.13 which are 10 years old. I am unable to support such old software.

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AM3352: AM335 failed to initial MMC2 with Spartlan Wifi