AM3359 BOOTING PROBLEM FROM MMC CARD

Sudheer Ravula

We are using AM3359ZCZ Processor.On power without MMC card i am getting CCC message continuously from UART0 port,still i am unable to connect JTAG PORT.When I insert MMC card i found 32KHz OSC2 clock is generated,but i am not able to boot the image from MMC card,so while debugging i found that clock for MMC card is not generated.My Boot order is 10111(MMC-SPI-UART-USB) and i am using 24MHz crystal(This design is taken from reference beaglebone design).kindly suggest me how can i debug the problem.

Regards

Venkatesh

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

From your post I cannot understand whether the main oscillator is running. Please follow this wiki for board bringup: http://processors.wiki.ti.com/index.php/AM335x_board_bringup_tips

0 Sudheer Ravula over 10 years ago in reply to Biser Gatchev-XID

Prodigy 130 points

HI
The main oscillator is running,today i am able to connect the JTAG also.But i am not able to boot from my MMC card(50Mz clock required for MMC is not generating from processor)
Regards
Venkatesh

0 Tyson Thomas over 10 years ago

Prodigy 70 points

Possibly the partitions you are using on your SD/MicroSD card could be incorrect (alignment. I have encountered a similar issue like this before when I formatted my own. Simple fix for me was to use a beaglebone SD card image and then replacing certain files (like MLO, u-boot.img) with the ones that you will want to use.

0 Biser Gatchev-XID over 10 years ago in reply to Sudheer Ravula

TI__Guru**** 393215 points

Where is your MMC card connected (which processor pins)?

0 Sudheer Ravula over 10 years ago in reply to Tyson Thomas

Prodigy 130 points

Hi Tyson Thomas
The Sample beagle Bone board is able to boot from the same MMC card with which our board is not able to boot.

0 Sudheer Ravula over 10 years ago in reply to Biser Gatchev-XID

Prodigy 130 points

HI
The board is replicated from beaglebone board schematics.The design is same as beaglebone revA6

MMC_CLK-G17/GPIO2_30
MMC_CMD-G18/GPIO2_31
MMC_DATA0-G16/GPIO2_29
MMC_DATA1-G15/GPIO2_28
MMC_DATA2-F18/GPIO2_27
MMC_DATA3-F17/GPIO2_26

Can you explain me when the MMC clock is generated from processor.when i insert MMC card the MMC-Clock is not generated.But the same MMC card is working in sample Beagle Bone board where i am able to probe the 50MHz MMC clock.I am suspecting that as MMC-Clock is not generating so i am not able to boot from MMC card

0 Biser Gatchev-XID over 10 years ago in reply to Sudheer Ravula

TI__Guru**** 393215 points

These are the correct pins. You should be able to boot from these pins if your SYSBOOT settings include MMC0.

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AM3359 BOOTING PROBLEM FROM MMC CARD