TDA4VM: Disconnect the SDCD line, The board can not boot from SD card.

Hongrun,

SDCD line is needed to detect the card's presence.  What boot mode are you using?

Try to write a '1' to [7]SDCD and to [6]CDTL in the Host Control 1 Register (Offset 028h).

Best Regards,

Shiou Mei

SDCD line should be used to detecting the card's presence. But on our customed board,  P23 is used as PCIE2_CLKREQn, not MMC1_SDCD.

SPL/Uboot boot mode is used for our project. 

For the SPL/Uboot option, the following binaries are required, which are available as part of the PSDK Linux package:

R5 bootloader (tiboot3.bin),

A72 bootloader (tispl.bin),

U-boot (U-boot.img)

DMSC System firmware binary (sysfw.itb).

Power on the board, This is no output log. That makes me confused, What should be done?

Ps: The board works well if SDCD line is connected.

Hongrun, 

What is the boot switch setting you have on the board?  Can you modify the uboot files to write a '1' to [7]SDCD and to [6]CDTL in the MMCSD Host Control 1 Register (Offset 028h)?

Thanks & REgards,

Shiou Mei

Hi Shiou Mei Huang:

In board-support/u-boot_build/r5/source/arch/arm/mach-k3/j721e_init.c , I find that board_init_f() is using for u-boot init .and also preloader_console_init() to do serial_init(), that can print uboot log, Like this： 

U-Boot SPL 2020.01-svn2210 (Apr 26 2021 - 21:39:35 +0800)

SYSFW ABI: 3.1 (firmware rev 0x0015 '21.1.1--v2021.01a (Terrific Lla')

and so on.

Is there any configs can be modified to solving SDCD Issue in j721e_init.c?  What's your suggestion?

Hongrun,

Can you confirm your boot switch settings?  Are you booting from SD card or are you booting from another peripheral?

Thanks & Regards,

Shiou Mei