CCS/PROCESSOR-SDK-AM335X: MMC configuration

Harshad Hapani 96

Prodigy 250 points

Part Number: PROCESSOR-SDK-AM335X

Tool/software: Code Composer Studio

Hello,

Currently i am using SDK(ti-processor-sdk-linux-am335x-evm-06.01.00.08) for my custom board.

In board, uSD is connected to mmc0, and eMMC is connected to mmc1.

I boot from mmc0, so this works OK, but when is remove uSD card and boot from emmc. that time kernel not start.

u-boot log:

=> mmc list
OMAP SD/MMC: 0 (SD)
=> mmc dev 0
switch to partitions #0, OK
mmc0 is current device
=> mmc dev 1
MMC Device 1 not found
no mmc device at slot 1
=> mmc dev 2
MMC Device 2 not found
no mmc device at slot 2
=>

For that gone through my dts file 2671.am335x-evmsk.dts.zip

So, how to configure mmc for emmc.

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Hi,

To boot from MMC1 you must change your SYSBOOT settings. See Table 26-7 in the AM335x TRM. There is no boot sequence that has MMC0 followed by MMC1.

0 Harshad Hapani 96 over 6 years ago in reply to Biser Gatchev-XID

Prodigy 250 points

hi biser,

I have already set boot sequence by the resistor in my custom board. Also pin mux setting in dtb file.

SYSBOOT[4:0] => 11100- MMC1 -> MMC0 -> UART0 -> USB0

i'm following this guide (https://processors.wiki.ti.com/index.php/AM335x_MMC/SD_Driver's_Guide).

After booting kernel and modules. Did not generate mmc_core.ko, mmc_block.ko and omap_hsmmc.ko in kernel/drivers/mmc/core/ folder.

0 Andreas Dannenberg over 6 years ago in reply to Harshad Hapani 96

TI__Guru 70392 points

Looks like this is related to your other post: https://e2e.ti.com/support/processors/f/791/t/879016, but specifically regarding the ability of ROM to access your eMMC.

Can you hook a logic analyzer up to your eMMC interface CLK and DAT signals, and the trigger a device reset (with SD card removed!)?

What do you see on the logic analyzer?

And in this case nothing is on the console, which is how you determine it doesn't work, correct?

Regards, Andreas

Processors

Processors forum

CCS/PROCESSOR-SDK-AM335X: MMC configuration