AM335X: MMC0 interface to WL18xx

Yang Yang8

Other Parts Discussed in Thread: WL1835

Hi, all

I know MMC2 is used as SDIO for WL18xx in AM335x evm board. But for our design MMC0 is a prefered choice, is there any problem except that we should modify some pinmux setting on linux kernel?

BTW: in I can see "Inside the am335x-evm board file there is an initialization function called am335x_evm_setup(). This function is called when the Linux kernel boots.

". But I can not find the file named board-am335xevm.c, only board-am3517evm.c. And also I can not find the function named am335x_evm_setup(). Do I misunderstand something?

Thanks

Yang

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Yang,

Which Linux kernel are you using?

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

Hi, Biser

I checked 3.10.10 and 3.18.11(which are downloaded directly from www.kernel.org), but I can not find these files. So would you pls provide a version which contain these files?

BR
Yang

0 Biser Gatchev-XID over 10 years ago in reply to Yang Yang8

TI__Guru**** 393215 points

On this forum we support only the TI distributed Linux SDK, current version 01.00.00.00 (kernel v3.14.26). Download link is this: http://software-dl.ti.com/sitara_linux/esd/processor-sdk/PROCESSOR-SDK-LINUX-AM335X/latest/index_FDS.html

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

Hi, Biser

I am very appreciated for your quick answer. Whether TI also release some bootloader(e.g U-boot) binary or source code for AM335x?

Thanks
Yang

0 Biser Gatchev-XID over 10 years ago in reply to Yang Yang8

TI__Guru**** 393215 points

Yes, this is all included in the SDK download.

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

Hi, Biser

I have just download the file named am335x-evm-sdk-src-01.00.00.00.tar.gz from the link you provided and unzip this file. But in /arch/arm/mach-omap2 menu still I can not find the file named "board_am335x-evm.c", is this source code the original linux-3.14.26 or the one TI modified to support am335x_evm?

Thanks
Yang

0 Biser Gatchev-XID over 10 years ago in reply to Yang Yang8

TI__Guru**** 393215 points

There are no board files in the new Linux versions. They have been replaced by device trees. If you are looking for an SDK version with board files, SDK 6.0 (kernel v3.2) is the last version with board file support: http://software-dl.ti.com/sitara_linux/esd/AM335xSDK/06_00_00_00/index_FDS.html

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

Hi, Biser

Thanks for the reply. Back to the topic, if MMC0 is used for sdio interface to connect with WL1835 instead of MMC2, is the dts file the only one I should modify if I use the new Linux version?

Best Regards
Yang

0 Biser Gatchev-XID over 10 years ago in reply to Yang Yang8

TI__Guru**** 393215 points

Yes, that should be enough. One additional note though: Take care that MMC0 is not included in your booting device list, as otherwise ROM code will try to connect to WLAN on MMC0 and boot may fail.

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

In the SDK6.0 I know that the WiLink pinmux setting is located in the file named "board_am335x_evm". But for the new Linux version, I can not find where does the kernel do this setting. Would you please give me some hint?

BR
Yang

0 Biser Gatchev-XID over 10 years ago in reply to Yang Yang8

TI__Guru**** 393215 points

It's done in the device tree.

0 Yang Yang8 over 10 years ago in reply to Biser Gatchev-XID

Intellectual 500 points

Would you please provide the detailed location in the kernel because I really can not find the pinmux setting for MMC3 which is used for wifi?

BR
Yang

0 Sachin T C M over 8 years ago in reply to Yang Yang8

Intellectual 960 points

Hello Yang,

Have you find any solution for your problem?

Regards
Sachin

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AM335X: MMC0 interface to WL18xx