TDA4VM: Boot from SD card if SDCD pin not connected

Jelena

Part Number: TDA4VM

For a custom board, similar to https://e2e.ti.com/support/processors/f/processors-forum/994425/tda4vm-disconnect-the-sdcd-line-the-board-can-not-boot-from-sd-card/, SDCD pin is not available due to pin conflict with PCIE2_CLKREQn.

Is it still possible to boot from the SD card without SDCD pin? Can the ROM bootloader handle this situation? Perhaps by selecting "Media=2" (SD, rather than autodetect) in the MMCSD boot parameter table, Table 4-65. in TRM version B?

The primary bootmode on the board will be OSPI and SD card is secondary, for development.

Thanks,

Jelena

over 3 years ago

0 Shiou Mei Huang over 3 years ago

TI__Genius 10180 points

Jelena,

Looks like the default ROM configuration enables PU on the card detect pin, so that might now allow the boot to go through. Will sanity check with the team if this is indeed the intended use case.

Thanks & Regards,

Shiou Mei

0 Shiou Mei Huang over 3 years ago in reply to Shiou Mei Huang

TI__Genius 10180 points

Jelena,

I have confirmed with team SD boot is not supported by ROM code if card detect pin is not at proper level (low). Can customer flash SD contents into eMMC for secondary?

Thanks & Regards,

Shiou Mei

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TDA4VM: Boot from SD card if SDCD pin not connected