AM3352: eMMC boot issue

Tony Tang

Mastermind 29092 points

Part Number: AM3352
Other Parts Discussed in Thread: CSD

Anyone used MTFC4GACAJCN-1M WT on AM335x as boot device before?

One customer use it can't boot.

Customer: Captured with logic analyzer, found AM335x ROM did not response after eMMC response CMD8 with EXT_CSD data.

over 6 years ago

0 Dachuan Liu over 6 years ago

Prodigy 220 points

The following is our board's eMMC command log, the last command is SEND_EXT_CSD and got responsed.

This is BBB's eMMC command log, followed by SEND_EXT_CSD, bootloader starts to read first block.

The difference between these two eMMC's ECSD:

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Please post the eMMC portion of the schematic, both on eMMC side and on processor side. Also post SYSBOOT settings.

0 Dachuan Liu over 6 years ago in reply to Biser Gatchev-XID

Prodigy 220 points

0 Biser Gatchev-XID over 6 years ago in reply to Dachuan Liu

TI__Guru**** 393215 points

You are using the wrong pins for MMC1 boot. Please refer to the Beaglebone Black schematic for correct connections, serial resistrors, and pullup resistors: elinux.org/Beagleboard:BeagleBoneBlack

0 Dachuan Liu over 6 years ago in reply to Biser Gatchev-XID

Prodigy 220 points

Yes, you are right, we've connected MMC to wrong pins.
We will try it on another board.

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AM3352: eMMC boot issue